Jiangyin Xingcheng Special Steel Works Co., Ltd (China)
Inventor
Liu, Zhaoxia
Xu, Xiaohong
Bai, Yun
Miao, Pifeng
Liu, Jun
Han, Buqiang
Zhou, Yonghao
Wu, Jinming
Gao, Jun
Li, Guozhong
Di, Menglong
Meng, Yu
Liao, Shuquan
Lu, Sha
Gao, Liang
Abstract
Disclosed is a method for manufacturing a 5Ni steel plate with a low remanence and an excellent surface quality to be used in a ship. The process flow thereof comprises: converter smelting→LF refining→RH high vacuum degassing→treatment with Ca→continuous casting→a slow cooling treatment to the slab→cleaning the surface of the slab→heating→rolling→quenching twice→tempering. The constituents comprise a low content of carbon, a low content of silicon, and 5% Ni, with V and Nb being added thereto, which improves the hardenability, improves the toughness at a low temperature, and improves the starting temperature of non-recrystallization of austenite. The steel plate can be subjected to high-temperature rolling and high-temperature quenching so as to significantly improve the shape of the plate, thus being applicable to the production of thin products.
JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO., LTD (China)
Inventor
Bai, Yun
Wu, Xiaolin
Zhang, Xuecheng
Lu, Mingxia
Cao, Hongfu
Sun, Hongping
Meng, Yu
Liao, Shuquan
Lu, Zhangwei
Sun, Wei
Abstract
A high-strength steel for reducer gears of new energy vehicles and a manufacturing method therefor. The chemical composition mass percentages of the gear steel are C: 0.13-0.18%, Si: ≤0.15%, Mn: 1.10-1.35%, Cr: 1.20-1.45%, P: ≤0.012%, S: ≤0.003%, Ni: 0.15-0.35%, Mo: 0.05-0.20%, Al: 0.015-0.050%, Nb: 0.015-0.050%, N: 0.0085-0.0225%, and B: 0.0015-0.0035%, the balance being Fe and unavoidable impurities. After the processing steps of primary refining-refining-vacuum degassing-continuous casting-hot delivery-rolling-isothermal heat treatment, etc., the steel banded structure is ≤1.5 grade, the hardness of the steel is ≤160 HBW, the austenite grain size of the steel is ≥8, there are no cracks defected on the surface of the steel, and the tensile strength of the steel after 870℃ oil quenching+200℃ tempering is ≥1180 MPa.
JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO., LTD. (China)
Inventor
Gu, Tie
Zhang, Qingsong
Guan, Yuehui
Hui, Shijie
Sun, Hongping
Zhang, Lei
Bai, Yun
Wu, Xiaolin
Cao, Hongfu
Abstract
The present invention relates to a rapid-spheroidization medium carbon bar steel and a manufacturing method therefor. Chemical components of the steel comprise, in percentage by mass: 0.30-0.60% of C, ≤0.40% of Si, 0.50-0.90% of Mn, ≤0.020% of P, ≤0.030% of S, ≤0.30% of Cr, and generally ≤0.25% of Cu and Ni; in order to regulate the properties, microalloy elements such as B can be properly added, and, in order to ensure the grain size, one or more grain refining elements such as Al, Nb and N can be added; and the balance is Fe and inevitable impurity elements. The steel is manufactured by performing smelting, continuous casting, heating, ultralow-temperature rolling and rapid spheroidization, the total spheroidization time being 5.5-6.5 h, which is equivalent to that of softening annealing and is far less than that of traditional spheroidizing annealing processes; the obtained material structure is a dot-like spheroidite+ferrite+a small amount of flaky cementite; and the steel has a hardness of ≤160 HBW and an elongation of ≥30%, and has an upsetting reduction rate of 80%, being free of cracking during cold heading and forging, thus facilitating cold-forming machining with large deformation.
JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO., LTD (China)
Inventor
Zhai, Jiaolong
Bai, Yun
Fan, Qihang
Wu, Xiaolin
Liu, Qian
Shao, Shuyan
Li, Yun
Zhang, Kui
Chen, Zelei
Li, Qian
Gao, Lei
Meng, Yu
Liao, Shuquan
Lu, Sha
Abstract
The present disclosure relates to a spheroidizing-annealed steel for the ball screw having high strength and resistance to low temperatures, wherein the chemical composition of the steel in mass percentage is: C: 0.40-0.70%, Si: 1.20-1.80%, Mn: 1.00-1.60%, Cr: 0.80-1.20%, S: ≤0.025%, P≤0.025%, Ni: 0.10-0.60%, Cu: 0.30-0.80%, Mo: 0.10-0.40%, Al≤0.05%, Ca≤0.0010%, Ti≤0.003%, O≤0.0010%, As≤0.04%, Sn≤0.03%, Sb≤0.005%, Pb≤0.002%, the balance is Fe and unavoidable impurities. In microstructure of the steel, cementite exists in a spheroidized state with a diameter of 0.1-0.5 μm, preferably 0.3-0.5 μm, a spheroidizing rate is 95% or more, and the rest is ferrite.
JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO., LTD (China)
Inventor
Liu, Zhaoxia
Li, Guozhong
Xu, Xiaohong
Bai, Yun
Miao, Pifeng
Liu, Jun
Zhou, Yonghao
Han, Buqiang
Wu, Jinming
Abstract
The invention relates to a 9Ni steel plate for ship LNG storage tank with high strength and low yield ratio. According to the mass percentage, the chemical constituents are C: 0.02-0.05%, Si: 0.10-0.30%, Mn: 0.50-0.80%, Ni: 8.90-9.50%, P: ≤0.0070%, s: ≤0.0020%, Cr: 0.10-0.25%, Alt: 0.010-0.035%, Nb: 0.010-0.020%, Ca: 0.0005-0.0030%, O: ≤0.0012%, N: ≤0.004%, H: ≤0.00015%, and the balance is Fe and unavoidable impurity elements. The production process flow is: smelting in a converter or electric furnace->RH vacuum degassing->LF refining->RH high vacuum degassing->Ca Treatment->continuous casting->slab slow cooling treatment->slab surface cleaning->heating->rolling ->quenching->tempering. For the 9Ni steel, especially the 9Ni thin steel plate, the invention adopts the constituents design of low C, 9% Ni, addition of Nb and Cr. The steel plate is subject to high-temperature hot rolling, and then QLT heat treatment process to obtain 9Ni steel with good strength, toughness and low yield ratio.
06 - Common metals and ores; objects made of metal
40 - Treatment of materials; recycling, air and water treatment,
Goods & Services
Common metals, unwrought or semi-wrought; steel sheets;
steel strip; blooms [metallurgy]; iron strip; angle irons of
metal; alloys of common metal; steel alloys; ingots of
common metal; bronze. Forging of metals; metalworking; metal casting; refining
services; soldering; laminating; waste treatment
(transformation); recycling of waste and trash.
7.
CARBURIZED BEARING STEEL FOR LARGE-LOAD ROLLING MILL BEARING AND PRODUCTION METHOD THEREFOR
JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO., LTD (China)
Inventor
Chen, Min
Bai, Yun
Yin, Qing
Wu, Xiaolin
Li, Wenbin
Liu, Ye
Hua, Liukai
Abstract
The present invention relates to a carburized bearing steel for a large-load rolling mill bearing and a production method therefor. The steel comprises the following chemical components (in percentages by mass): C: 0.17-0.23, Si: 0.15-0.40, Mn: 0.30-0.60, Cr: 1.25-1.75, Mo ≤ 0.08, Ni: 3.25-3.75, Al: 0.01-0.05, P ≤ 0.020, S ≤ 0.015, Cu ≤ 0.20, Nb: 0.05-0.09, V: 0.07-0.13, Ca ≤ 0.0010, Ti ≤ 0.0015, O ≤ 0.0008, and the balance of Fe and inevitable impurities. The metallographic structure of the steel is bainite, and the grain size is larger than or equal to grade 5. The steel is molded by means of a production method, which comprises: continuously casting a large continuous casting billet via a CCM, slowly cooling same, heating and rolling same to form an intermediate billet, slowly cooling same, heating and rolling same to form a steel material, slowly cooling and annealing same, and then performing finishing. In the present application, the bainite structure of the steel material is finer and more uniform than that of an electroslag steel, and the production cost is lower, such that the market competitiveness of such a steel product is remarkably improved.
06 - Common metals and ores; objects made of metal
40 - Treatment of materials; recycling, air and water treatment,
Goods & Services
Common metals, unwrought or semi-wrought; steel sheets;
steel strip; blooms [metallurgy]; iron strip; angle irons of
metal; alloys of common metal; steel alloys; ingots of
common metal; bronze. Forging of metals; metalworking; metal casting; refining
services; soldering; laminating; waste treatment
(transformation); recycling of waste and trash.
9.
A WEAR-RESISTANT STEEL WITH EXCELLENT SURFACE QUALITY AND A PRODUCTION METHOD THEREOF
JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO., LTD (China)
Inventor
Liu, Jun
Li, Guozhong
Yang, Yang
Xu, Xiaohong
Wu, Jinming
Miao, Pifeng
Xu, Guoqing
Wang, Xiaoshuang
Abstract
The invention relates to a wear-resistant steel with excellent surface quality, which is composed of C: 0.12-0.20%, Si: ≤0.1%, Mn: 0.6-1.20%, Nb: 0.010-0.040%, V: ≤0.01%, Ti: 0.010%-0.030, Al: ≤0.04%, Ni: ≤0.1%, Cu: ≤0.1%, Cr: 0.10-0.40%, Mo: ≤0.1%, B: 0.001-0.005%, Ca: 0.0010-0.0050%, P: ≤0.010%, S: ≤0.0015%, O: ≤0.0012%, N: ≤0.0035%, H: ≤0.0002%, the balance is Fe, and the carbon equivalent CEV≤0.4; PCM≤0.25. The production process flow is: converter smelting->LF refining->VD or Rh high vacuum degassing->continuous casting->heating->rolling->shot blasting->quenching->tempering. The wear-resistant steel of the invention has better surface quality, and there are no surface defects such as air pit, inclusion, hemp pit and pressed iron oxide scale. The depth of surface spots caused by the peeling off iron oxide scale is ≤0.1 mm, and the surface grinding of steel plate cannot be carried out. Based on element design, non-preheating welding and excellent toughness can be further realized.
JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO., LTD. (China)
Inventor
Zhai, Jiaolong
Bai, Yun
Fan, Qihang
Wu, Xiaolin
Liu, Qian
Shao, Shuyan
Li, Yun
Zhang, Kui
Chen, Zelei
Li, Qian
Gao, Lei
Meng, Yu
Liao, Shuquan
Lu, Sha
Abstract
The present invention relates to spheroidizing-annealed steel for a low-temperature-resistant high-strength ball screw. In percentage by mass, the chemical components of the steel comprises: C: 0.40-0.70%; Si: 1.20-1.80%; Mn: 1.00-1.60%; Cr: 0.80-1.20%; S: ≤0.025%; P: ≤0.025%; Ni: 0.10-0.60%; Cu: 0.30-0.80%; Mo: 0.10-0.40%; Al: ≤0.05%; Ca: ≤0.0010%; Ti: ≤0.003%; O: ≤0.0010%; As: ≤0.04%; Sn: ≤0.03%; Sb: ≤0.005%; Pb: ≤0.002%; and the balance of Fe and inevitable impurities. In the microstructure of the steel, the cementite exists in a spheroidized state with a diameter of 0.1-0.5 μm, preferably 0.3-0.5 μm, the spheroidization rate reaches 95% or above, and the rest of the structure is ferrite.
C21D 8/06 - Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
B21B 1/46 - Metal rolling methods or mills for making semi-finished products of solid or profiled cross-sectionSequence of operations in milling trainsLayout of rolling-mill plant, e.g. grouping of standsSuccession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO., LTD (China)
Inventor
Bai, Yun
Chen, Haiyan
Zhang, Jianfeng
Liu, Hai
Li, Xuanjun
Zheng, Xiaowei
Sun, Yicheng
He, Jiafeng
Abstract
The present invention relates to a cord steel wire rod suitable for deep drawing and a manufacturing method therefor. The wire rod has a metallographic structure of sorbite+pearlite+ferrite, wherein the proportion of the sorbite is controlled within 60-70%, the proportion of the pearlite is controlled within 30-40%, and the ferrite exists as a small amount of tissue and has a proportion of less than or equal to 10%. The thickness of a pearlite lamella is 0.10-0.35 mm, the size of a pearlite colony is 10-20 um, and the feature of the pearlite corresponds to a smaller dislocation density. The level of central carbon segregation is evaluated according to YB/T4413 "metallographic evaluation method for central carbon segregation of high-carbon steel wire rod" and lower than or equal to level 1, and the level of network cementite in the tissue is lower than or equal to level 1. The tensile strength σ is (103762 * Ceq to 114606 * Ceq) MPa, and the reduction of area is 38% or above, such that the cord steel wire rod is more suitable for deep drawing.
JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO., LTD (China)
Inventor
Zhang, Lin
Zhang, Jianfeng
Lu, Changhe
Guan, Yuehui
Li, Guozhong
Xu, Xiaohong
Bai, Yun
Zong, Hao
He, Jiafeng
Chen, De
Huang, Zhen
Yang, Jia
Abstract
A method for controlling carbide network in a bearing steel wire rod by controlling cooling and rolling, comprises the following steps: rapidly rolling a bar to a wire rod and spinning it into a loose coil, controlling the rolling temperature at 780° C.-880° C.; and the spinning temperature at 750° C.-850° C.; carrying out on-line controlling cooling of continuous loose coils using EDC water bath austempering cooling process, controlling the cooling rate at 2.0° C./s-10° C./s, and controlling the final cooling temperature within 620-630° C.; after EDC water bath austempering cooling, using slow cooling under a cover, and the temperature is controlled to be 400° C.-500° C. when being removed out of the cover; after slow cooling, collecting coils, and cooling in air to the room temperature.
C21D 8/06 - Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
C21D 9/52 - Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articlesFurnaces therefor for wiresHeat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articlesFurnaces therefor for strips
JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO., LTD (China)
Inventor
Liu, Haikuan
Bai, Yun
Luo, Yuandong
Miao, Pifeng
Ye, Jianjun
Zhang, Jian
Yun, Pengcheng
Yu, Xinyun
Xu, Jun
Abstract
A hydrogen-induced-cracking-resistant pressure vessel steel plate with a thickness greater than 200-250 mm. The steel plate contains the following chemical components: C: 0.10-0.20%, Si: 0.15-0.40%, Mn: 0.95-1.35%, P: ≤0.005%, S: ≤0.0008%, Cr: 0.10-0.30%, Ni: 0.25-0.40%, Mo: 0.08-0.12%, Alt: 0.02-0.05%, Nb: 0.01-0.02%, V: 0.01-0.03%, Ti: 0.01-0.02%, and B: ≤0.0005%, with the balance being Fe and inevitable impurity elements. In addition, the chemical components satisfy the carbon equivalent Ceq being less than or equal to 0.45%, and Ceq=C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15. By using high-temperature diffusion heating, high-permeability rolling and normalization + accelerated cooling with water + tempering heat treatment processes, optimal matching of the mechanical properties of a large-thickness hydrogen-induced-cracking-resistant pressure vessel steel plate is realized, and the internal quality and hydrogen-induced-cracking resistance of the steel plate are greatly improved.
JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO., LTD (China)
Inventor
Huang, Jun
Luo, Yuandong
Bai, Yun
Li, Jingtao
Xu, Xiaohong
Lin, Tao
Wu, Jianpeng
Li, Chenxiao
Hou, Meiling
Zi, Xianpeng
Zhou, Peirong
Xu, Hailong
Abstract
The present invention relates to a thin specification NM450 steel plate, chemical components of said steel plate, in percentage by weight, being: C: 0.15-0.30, Si: 0.25-0.45, Mn: 0.80-1.20, Cr: 0.20-0.60, Mo: 0.10-0.50, Ni: 0.10-0.50, Al: 0.02-0.08, B: 0.0010-0.0030, P ≤ 0.020, S ≤ 0.010, and the remainder being Fe and unavoidable impurities. The main route of a process is: steel-making → continuous casting → slab compositing or pre-fabricated intermediate slab compositing → rolling → quenching (determining whether to quench after separation according to steel plate thickness) → tempering → finishing → inspecting → warehousing. The thickness of a steel plate made by the present invention is 4-8 mm, the maximum width of a steel plate reaches 3200 mm, and the present invention effectively solves the problems of a hot continuously rolled thin plate having a small width and a portion of wide and thick plate companies lacking coiling and rolling equipment being unable to produce this type of thin steel plate.
JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO., LTD (China)
Inventor
Chen, Min
Luo, Yuandong
Bai, Yun
Li, Feng
Yin, Qing
Wu, Xiaolin
Li, Wenbin
Abstract
The present invention relates to steel for inner raceway of a constant velocity universal joint and a production method therefor. The steel comprises the following chemical components in percentage by weight (wt%): 0.15-0.25% of C, 0.01-0.15% of Si, 0.25-0.75% of Mn, 0.80-1.30% of Cr, 0.001-0.003% of B, 0.010-0.040% of Ti, less than or equal to 0.015% of S, less than or equal to 0.025% of P, less than or equal to 0.25% of Ni, less than or equal to 0.20% of Mo, less than or equal to 0.30% of Cu, less than or equal to 0.05% of Al, less than or equal to 0.0010% of Ca, less than or equal to 0.0010% of O, less than or equal to 0.04% of As, less than or equal to 0.03% of Sn, less than or equal to 0.005% of Sb, and less than or equal to 0.002% of Pb, with the balance being Fe and inevitable impurities. The production process comprises primary smelting, refining, vacuum degassing, continuous casting, continuous rolling, annealing, and finishing. The hardness of the steel is less than or equal to 80 HRB; a microscopic structure is ferrite and pearlite; the austenite grain size of the steel is greater than or equal to 6 grade; the banded structure of the steel is graded according to GB/T 13299 and does not exceed 2.0 grade. The hardenability of the tail end of the steel is evaluated according to a GB/T 225 method, and the hardenability of the J5 point is 36-44 HRC, and the hardenability of the J13 point is 24-32 HRC. The steel for the inner raceway of the constant velocity universal joint belongs to novel carburized steel for a universal joint inner raceway, and meets the hardenability, wear resistance, and cold forging performance of the steel for the universal joint inner raceway.
JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO., LTD (China)
Inventor
Chen, Min
Bai, Yun
Luo, Yuandong
Wu, Xiaolin
Yin, Qing
Li, Wenbin
Hua, Liukai
Liu, Ye
Abstract
The present invention belongs to the technical field of special steel smelting, and relates to a steel for a ball-cage type universal joint retainer and a production method therefor. The steel comprises the following chemical ingredients by wt%: 0.10 - 0.25% of C, 0.20 - 0.40% of Si, 0.40 - 0.65% of Mn, 0.40 - 0.70% of Cr, 0.0003 - 0.0025% of B, 0.010 - 0.035% of Ti, 0.30 - 0.45% of Mo, 0.0050 - 0.0100% of N, ≤ 0.015% of S, ≤ 0.025% of P, ≤ 0.25% of Ni, ≤ 0.30% of Cu, 0.015 - 0.035% of Al, ≤ 0.0010% of O,≤ 0.04% of As,≤ 0.03% of Sn, ≤ 0.005% of Sb, ≤ 0.002% of Pb, and the balance being Fe and unavoidable impurities. The microstructure of the steel is bainite, and the grain size of austenite is larger than or equal to 6 grades. The production process comprises primary smelting of molten steel, refining of molten steel, vacuum degassing of molten steel, continuous casting, hot rolling and finishing. In the present application, the chemical ingredients are optimized, and the alloy costs are reduced. Furthermore, a hardenability similar to that of 20CrMnTi is achieved, the strength and toughness of the steel manufactured by combining the chemical ingredients with the production method are better than the strength and toughness of 20CrMnTi, and the comprehensive performance meets the requirements of the steel for the ball-cage type universal joint retainer.
JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO., LTD (China)
Inventor
Chen, Min
Bai, Yun
Luo, Yuandong
Wu, Xiaolin
Yin, Qing
Li, Wenbin
Hua, Liukai
Liu, Ye
Abstract
The present invention relates to steel for a ball cage-type universal joint cage and a production method therefor, relating to the technical field of special steel smelting. The chemical composition of the steel in wt% is C: 0.10-0.25%, Si: 0.20-0.40%, Mn: 0.40-0.65%, Cr: 0.40-0.70%, B: 0.0003-0.0025%, Ti: 0.010-0.035%, Mo: 0.30-0.45%, N: 0.0050-0.0100％, S≤0.015％, P≤0.025％, Ni≤0.25％, Cu≤0.30％, Al: 0.015-0.035%, O≤0.0010%, As≤0.04%, Sn≤0.03%, Sb≤0.005%, Pb≤0.002%, and the balance being Fe and unavoidable impurities. The microstructure of the steel is bainite, and the austenite grain size is ≥ level 6. The production process comprises: molten steel primary smelting, molten steel refining, molten steel vacuum degassing, continuous casting, hot rolling, and finishing. The present application optimises the chemical composition and reduces the alloy costs; and reaches a hardenability similar to 20CrMnTi, the strength and toughness of the steel made by said chemical composition combined with the production method being better than 20CrMnTi, and the comprehensive performance meeting the requirements of steel used for a ball cage-type universal joint cage.
JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO., LTD (China)
Inventor
Zhang, Lei
Bai, Yun
Luo, Yuandong
Wu, Xiaolin
Li, Bing
Tang, Minhao
Sun, Yifan
Gu, Pan
Zhu, Heping
Liu, Wen
Abstract
A steel for cold forging a universal joint fork of a passenger vehicle, and a manufacturing method therefor. Chemical components of the steel by mass % include: C: 0.04-0.10%, Si: 0.01-0.12%, Mn: 0.40-0.60%, P: ≤ 0.015%, S: 0.020-0.035%, Cr: ≤ 0.10%, Ni: ≤ 0.10%, Cu: ≤ 0.10%, Mo: ≤ 0.02%, Al: 0.020-0.050%, N: 0.007-0.009%, and the rest are Fe and unavoidable impurity elements. The structure of the steel is ferrite and pearlite, wherein the spheroidization rate of the pearlite is greater than or equal to 85%. The production process route comprises: molten iron pre-treatment; converter primary refining; refining; continuous casting; continuous casting billet cooling; continuous casting billet heating; rolling; cooling; spheroidizing annealing; and edge trimming. Taking a bar of Φ20mm-Φ40mm as an example, the surface hardness ≤ 110HV30; Rp ≤ 0.2 ≤ 280MPa, Rm ≤ 360MPa, elongation A5 ≥ 40%, and section shrinkage Z ≥ 75%. The product has excellent plasticity and low deformation resistance, and is an ideal steel for cold forging.
JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO., LTD (China)
Inventor
Liu, Zhaoxia
Luo, Yuandong
Xu, Xiaohong
Bai, Yun
Liu, Jun
Meng, Yu
Zhou, Yonghao
Wu, Jinming
Chen, Chong
Abstract
The present invention relates to a shipbuilding 5Ni steel submerged arc welding method: (1) shipbuilding 5Ni steel of which the tensile strength is 630-670 MPa serves as a splicing base material; a matching welding material: the welding material tensile strength being 630-710 MPa, the welding wire diameter being φ2.4 mm or more, the grade being INCO-WELD Filler Metal C-276, and INCOFLUX 9 being the flux; (2) a K-shaped groove is employed as the submerged arc welding groove for the splicing material; (3) welding parameters: the welding current being 410±10 A, the welding voltage being 32±1 V, the welding speed being 27±2 cm/min, the welding wire energy being 30±3 KJ/cm, but joints of splicing base materials of a same plate thickness are welded continuously until the welding seam is filled, and a steel brush is employed to clean the weld bead after each instance of welding; a flux baking system being 350 °C × 1 h; and the interlayer temperature being controlled at ≤ 80 °C. Submerged arc welding achieves increased levels of butt joint tensile strength and impact energy absorption values of the butt joint weld bead, a welding line, and a heat affected zone; the welded joint is provided with excellent low-temperature impact toughness and cold bending performance.
JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO., LTD (China)
Inventor
Liu, Zhaoxia
Luo, Yuandong
Xu, Xiaohong
Liu, Jun
Meng, Yu
Gao, Jun
Xu, Guangqin
Han, Buqiang
Zhou, Yonghao
Abstract
The present invention relates to a normalized-condition delivered 100-120mm thick FH36 steel plate for offshore wind power pipe piles. The steel plate comprises the following chemical components based on National Standard GB712 and classification society rule, in percentages by weight: 0.11-0.13% of C, 0.15-0.50% of Si, 1.20-1.60% of Mn, P ≤0.0070%, S ≤0.0030%, 0.030-0.060% of Nb, 0.020-0.050% of Al, 0.008-0.030% of Ti, 0.40-0.80% of Ni, 0.10-0.20% of Cr, 0.10-0.35% of Cu, 0.0005-0050% of Ca, and the balance being Fe. The carbon equivalent CEV is ≤0.49%, the matrix structure is composed of a proeutectoid ferrite + acicular ferrite, and the average grain size is 6-15μm. Due to the center segregation of a continuous cast blank, a small amount of strip pearlites are possibly generated in the center portion of the steel plate. The preparation process of the steel plate comprises: converter -> LF refining -> RH vacuum degassing -> Ca treatment -> continuous casting -> cast blank dehydrogenation treatment -> heating -> rolling -> normalizing.
JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO., LTD (China)
Inventor
Sun, Xianjin
Li, Guozhong
Xu, Xiaohong
Bai, Yun
Miao, Pifeng
Lin, Tao
Zhu, Jianyang
Xu, Feng
Shi, Ailai
Zhou, Haiyan
Abstract
The present invention relates to a granular bainite high-strength steel plate used in a low-temperature environment, and a manufacturing method therefor. The steel plate has the following chemical components (wt.%): 0.05-0.11 of C, 0.20-0.50 of Si, 1.00-1.40 of Mn, 0.02-0.04 of Al, 0.01-0.03 of Nb, 0.01-0.03 of Ti, 0.80-1.30 of Ni, 0.30-0.60 of Mo, 0.30-0.60 of Cr, 0.0008-0.0020 of B, S≤0.003，P≤0.015, and the balance of Fe and inevitable impurities. The manufacturing method comprises the procedures of converter smelting, LF+RH(VD) smelting, slab continuous casting, slab heating, rolling, heat treatment, etc. in sequence. The present invention provides a granular bainite high strength steel plate which is used at -60ºC, and has a yield strength of ≥500 MPa, a tensile strength of ≥700 MPa, a yield ratio of ≤0.70, and an impact power at -60ºC≥100 J.
06 - Common metals and ores; objects made of metal
40 - Treatment of materials; recycling, air and water treatment,
Goods & Services
Steel, unwrought or semi-wrought; steel alloys; steel strip;
steel sheets; blooms [metallurgy]; common metals, unwrought
or semi-wrought; alloys of common metal; steel tubes;
building materials of metal; railway material of metal. Metal treating; woodworking; paper finishing; flour milling;
slaughtering of animals; dressmaking; printing; air
purification; water treating; framing of works of art.
23.
METHOD FOR MANUFACTURING LOW REMANENCE 5NI STEEL PLATE WITH EXCELLENT SURFACE QUALITY
JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO., LTD (China)
Inventor
Liu, Zhaoxia
Xu, Xiaohong
Bai, Yun
Miao, Pifeng
Liu, Jun
Han, Buqiang
Zhou, Yonghao
Wu, Jinming
Gao, Jun
Li, Guozhong
Di, Menglong
Meng, Yu
Liao, Shuquan
Lu, Sha
Gao, Liang
Abstract
Disclosed is a method for manufacturing a low remanence 5Ni steel plate with an excellent surface quality. The process flow thereof comprises: converter smelting -> LF refining -> RH high vacuum degassing -> treatment with Ca -> continuous casting -> a slow cooling treatment of a ingot blank -> surface cleaning of the ingot blank -> heating -> rolling -> quenching twice -> tempering. The components comprises low carbon, low silicon, and 5% Ni, with V and Nb being added thereto, which improves the hardenability, the low temperature toughness, and the non-recrystallization starting temperature of austenite. The steel plate can be subjected to high temperature rolling and high temperature quenching so as to significantly improve the shape of the plate, thus being applicable to the production of products which are made to be thin according to specifications. The method is optimized from the aspects of element designs, process control, base material organization, center segregation, quenching and tempering temperatures, the time, etc., and ensures that the steel plate has a good elongation, a low temperature impact toughness at -130ºC, an excellent surface quality, and a low remanence, while achieving a high strength 5Ni steel plate.
JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO., LTD (China)
Inventor
Liu, Zhaoxia
Xu, Xiaohong
Miao, Pifeng
Zhou, Yonghao
Liu, Jun
Han, Buqiang
Xu, Guangqin
Wu, Jinming
Gao, Jun
Abstract
33 of austenite ferrite, and the total number of rolling passes is 8-12 passes; and air cooling is performed after rolling, Nb precipitates in the steel plate during the air cooling, and the triangular grain boundaries, grain boundaries and intragranularity of ferrite grains are pinned to limit the rapid growth of the ferrite. Therefore, a normalized rolled EH36 steel plate for offshore wind power is obtained.
C22C 38/02 - Ferrous alloys, e.g. steel alloys containing silicon
25.
A STEEL FOR GRADE R6 OFFSHORE MOORING CHAIN WITH HIGH STRENGTH AND HIGH TOUGHNESS AND ITS CHAIN USE IN ANCHORING AND MOORING FLOATING BODIES WITH CATHODIC PROTECTION
JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO., LTD (China)
Inventor
Yin, Jiang
Bao, Xuejun
Liu, Zhenwei
Bai, Yun
Xu, Xiaohong
Zhang, Ming
Fan, Haidong
Li, Yao
Li, Hongli
Chen, De
Zhu, Guorong
Hu, Guoren
Yao, Tiehua
Gu, Qiuhao
Cui, Yong
Huang, Erxin
Liu, Xuewen
Liangliang, Li
Abstract
The present application relates to a steel for grade R6 offshore mooring chain for use in anchoring and mooring floating bodies with cathodic protection: the chemical composition are C 0.18˜0.24%, N 0.006˜0.024, P 0.005˜0.025, S≤0.005, Si 0.15˜0.35, Mn 0.20˜0.40, Cr 1.40˜2.60, Ni 0.80˜3.20, Mo 0.35˜0.75, Cu≤0.50, Al≤0.02, Ti≤0.005, V 0.04˜0.12, Nb 0.02˜0.05, Ca 0.0005˜0.004, O≤0.0015, H≤0.00015, the balance is Fe: the total content of alloy ΣM=(Si+Mn+Cr+Ni+Mo+Cu), 3.4<ΣM≤6.8; the total content of microalloy ΣMM=(Ti+Al+Nb+V), 0.065≤ΣMM≤0.194. The corrosion potential is adjusted to prevent hydrogen embrittlement caused by cathodic overprotection on the basic premise of maintaining the strength, toughness and low corrosion rate of the steel. Where V is only used for strengthening, and the content of N in VCN is increased, especially for the increase of the temperature for chain quenching to make M3C, M2C and VCN fully dissolved in solid solution and fully precipitated in tempering, which improves the precipitation strengthening effect.
JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO., LTD (China)
Inventor
Yang, Hongwei
Xu, Xiaohong
Bai, Yun
Miao, Pifeng
Ye, Jianjun
Zhang, Jian
Zhang, Jun
Fang, Shouyu
Xu, Jun
Abstract
222 at 1/2 of the plate thickness is ≥ 80 J. The manufacturing process therefor involves: pre-treatment of molten iron → converter smelting → ladle furnace refining → vacuum degassing treatment → continuous casting → casting blank cooling with a cover → casting blank heating → controlled rolling → controlled cooling → stacking for slow cooling → tempering. An online quenching process is also used to ensure that the steel plate has a good strength and toughness; furthermore, online quenching can significantly shorten the delivery cycle thereof.
JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO., LTD (China)
Inventor
He, Guangxia
Wu, Yang
Li, Guozhong
Xu, Xiaohong
Bai, Yun
Miao, Pifeng
Huang, Jun
Ge, Henggui
Di, Menglong
Meng, Yu
Abstract
A pre-hardened mirror mold steel plate, wherein the elemental composition thereof is: C: 0.28 to 0.36%, Si: 0.50 to 0.80%, Mn: 1.20 to 1.50%, P ≤ 0.020%, S ≤ 0.010%, Cr: 1.30 to 1.80%, Mo: 0.30 to 0.50%, Ni: 0.65 to 0.90%, V: 0.15 to 0.30%, H ≤ 1.5 ppm, and the balance of Fe and inevitable impurities. A pre-hardened mirror mold steel plate having high hardenability is obtained by using a manufacturing method comprising subjecting continuous casting billets to processes such as rolling, offline slow cooling, normalizing and tempering heat treatments. The advantages of the manufacturing method lie in that the production efficiency of continuous casting is high, the manufacturing costs are low, the hardness of the non-quenched and tempered state of a steel plate having a thickness of 20 - 180 mm reaches 38 - 42 HRC, the hardness fluctuation of the full thickness ≤ 2 HRC, and the level of flaw detection satisfies the requirement of GB/T2970I level.
JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO., LTD (China)
Inventor
Chen, Min
Geng, Ke
Yin, Qing
Li, Feng
Li, Guozhong
Xu, Xiaohong
Bai, Yun
Wu, Xiaolin
Abstract
The present invention relates to a steel for a ball screw bearing. The alloy composition in percentage by mass is C: 0.45 to 0.60%, Si: 0.15 to 0.40%, Mn: 0.50 to 0.80%, Cr: 0.15 to 0.40%, B: 0.002 to 0.006%, V: 0.02 to 0.07%, S ≤ 0.015%, P ≤ 0.025%, Mo ≤ 0.10%, Al ≤ 0.08%, Ca ≤ 0.0010%, O ≤ 0.0010%, As ≤ 0.04%, Sn ≤ 0.03%, Sb ≤ 0.005%, Pb ≤ 0.002%, the balance being Fe and inevitable impurities. A preparation process for a bar product involves molten steel smelting, continuous casting, billeting, hot rolling, tempering, stress relief annealing, etc. The final performance meets: the surface hardness of the bar reaches 220-260 HBW, the metallographic structure of the bar is a uniform sorbite structure, the austenite grain size of the bar is ≥ 7, the bar yield strength is 600-800 MPa, the tensile strength is 800-900 MPa, and the elongation is ≥ 15%.
JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO., LTD (China)
Inventor
Jiang, Changlin
Li, Guozhong
Zhu, Jianyang
Lin, Tao
Miao, Pifeng
Xu, Weiming
Xu, Guoqing
Zhou, Haiyan
Xu, Xiaohong
Bai, Yun
Abstract
HIC-resistant and large deformation-resistant pipeline steel, the alloy composition percentage by weight being calculated as: C: 0.015-0.039%, Si: 0.15-0.35%, Mn: 1.6-1.9%, S: ≤0.002%, P: ≤0.012%, Al: 0.02-0.045%, Cr: 0.15-0.35%, 0.05≤Nb+V+Ti≤0.1%, where Nb, V and Ti are not equal to 0, Ni: 0.15-0.50%, Cu: 0.01-0.25%, Ca: ≤0.002%, N: ≤0.0046%, Mo 0.01-0.20%, and the remainder being Fe and inevitable impurity elements. The steel has a bainite single-phase structure, the bainite grain size being 11.5 grade or greater. Product transverse yield ratio Rt0.5/Rm≤0.78, -20°C Charpy impact energy≥350J, -20°C drop hammer shearing area SA%≥90%; longitudinal uniform elongation Uel≥11%, longitudinal yield ratio≤0.77; longitudinal stress ratios Rt1.5/Rt0.5≥1.18, Rt2.0/Rt1.0≥1.1; HIC resistance properties: immerse in a NACE TM0284-2004 A solution for 96 hours, crack length rate %: 0, crack width rate %: 0, crack susceptibility %: 0.
JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO., LTD (China)
Inventor
Liu, Jun
Li, Guozhong
Wang, Xiaoshuang
Wu, Jinming
Yang, Yang
Han, Buqiang
Miao, Pifeng
Abstract
Provided is a high-temperature-resistant 400HB wear-resistant steel plate, having the chemical composition: C: 0.15–0.25%, Si: 0.10–0.40%, Mn: 0.8–1.30%, Nb: 0.010–0.040%, V: 0.030–0.060%, Ti: ≤0.010%, Al: 0.03–0.06%, Ni: ≤0.1%, Cu: ≤0.1%, Cr: 0.10–0.50%, Mo: 0.50–1.00%, B: 0.001–0.005%, Ca: 0.0010–0.0050%, P: ≤0.010%, S: ≤0.0015%, O: ≤0.0015%, N: ≤0.0035%, H: ≤0.0002%, and 0.55 ≤ carbon equivalent value (CEV) ≤ 0.65, wherein CEV=C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15; the remainder is Fe and inevitable impurity elements. In the production process, cooling is controlled after rolling, the grains are refined, and fine lath martensite is obtained for subsequent offline quenching. After quenching, high-temperature tempering is used, and under the combined effect of the Cr/Mo/V precipitates, the microstructure of the high-temperature performance finished steel plate is ensured to be uniform tempered sorbite, having a small grain size of ≤25 μm; the ferrite matrix is dispersed with fine and uniform precipitate, the precipitate being carbide.
JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO., LTD (China)
Inventor
Liu, Zhaoxia
Li, Guozhong
Xu, Xiaohong
Bai, Yun
Miao, Pifeng
Liu, Jun
Zhou, Yonghao
Han, Buqiang
Wu, Jinming
Abstract
Disclosed is a high-strength and low-yield-ratio 9Ni steel plate for ship LNG storage tanks, with the chemical components of the steel plate being, in mass percentage: C: 0.02-0.05%, Si: 0.10-0.30%, Mn: 0.50-0.80%, Ni: 8.90-9.50%, P: ≤ 0.0070%, S: ≤ 0.0020%, Cr: 0.10-0.25%, Alt: 0.010-0.035%, Nb: 0.010-0.020%, Ca: 0.0005-0.0030%, O: ≤ 0.0012%, N: ≤ 0.004%, and H: ≤ 0.00015%, with the balance being Fe and inevitable impurity elements. The production process flow is: converter or electric furnace steel-making -> RH vacuum degassing -> LF refining -> RH high vacuum degassing -> Ca treatment -> continuous casting -> slow cooling treatment of a casting blank -> cleaning the surface of the casting blank -> heating -> rolling -> quenching -> tempering. With regard to the 9Ni steel plate, a composition design of a low level of C, 9% of Ni and increased levels of Nb and Cr is used. By means of high-temperature hot rolling and a subsequent special QLT heat treatment process, a 9Ni steel with a good strength and toughness and a low yield ratio is obtained.
JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO., LTD (China)
Inventor
Liu, Jun
Li, Guozhong
Yang, Yang
Xu, Xiaohong
Wu, Jinming
Miao, Pifeng
Xu, Guoqing
Wang, Xiaoshuang
Abstract
A wear-resistant steel with excellent surface quality, the components being: C: 0.12-0.20％, Si: ≤0.1％, Mn: 0.6-1.20％, Nb: 0.010-0.040％, V: ≤0.01％, Ti: 0.010％-0.030, Al: ≤0.04％, Ni: ≤0.1％, Cu: ≤0.1％, Cr: 0.10-0.40％, Mo: ≤0.1％, B: 0.001-0.005％, Ca: 0.0010-0.0050％, P: ≤0.010％, S: ≤0.0015％, O: ≤0.0012％, N: ≤0.0035％, and H: ≤0.0002％, the remainder being Fe, the carbon equivalent CEV ≤0.4, and PCM≤0.25. The production process comprises: converter steelmaking->LF refining->VD or RH high vacuum degassing->continuous casting->heating->rolling->shot blasting processing->quenching->tempering. The wear-resistant steel has better surface quality, and there are no surface defects such as air pockets, inclusions, pitting, and pressed iron oxide scale. The surface mottling depth caused by iron oxide scale peeling is ≤0.1 mm, and steel plate surface grinding does not need to be carried out. On the basis of the element design, non-preheating welding and excellent toughness can be further achieved.
JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO., LTD (China)
Inventor
Sun, Xianjin
Li, Guozhong
Xu, Xiaohong
Bai, Yun
Miao, Pifeng
Xu, Feng
Zhu, Jianyang
Shi, Ailai
Lin, Tao
Wang, Xiaoshuang
Abstract
A low yield-to-tensile ratio thin specification pipeline steel manufacturing method. The method comprises steps such as convert smelting, LF refining, RH vacuum degassing, 150 mm slab continuous casting, inspecting and cleaning up the continuous cast slabs, cast slab heating, high pressure water descaling, coiling, rolling, and ACC cooling. The chemical composition contents by percent of the pipeline steel are: C 0.075-0.095, Si 0.2-0.3, Mn 1.65-1.75, Al 0.02-0.04, Nb 0.045-0.055, Ti 0.01-0.02, Cr 0.20-0.30, and S ≤ 0.0008, with Ca/S ≥ 2 and the balance being Fe and unavoidable impurities; the thickness specification of the product is 5-8 mm, yield strength ≥ 485 MPa, tensile strength ≥ 570 MPa, yield-to-tensile ratio ≤ 0.85, elongation ≥ 30%, and -40°C impact energy ≥ 100 J.
C21D 8/02 - Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
34.
X80-GRADE PIPELINE STEEL PLATE HAVING LOW CARBON EQUIVALENT, THICKNESS OF OVER 40 MM, AND HIGH TOUGHNESS AT LOW TEMPERATURES, AND MANUFACTURING METHOD THEREFOR
JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO., LTD. (China)
Inventor
Jiang, Changlin
Li, Guozhong
Xu, Xiaohong
Miao, Pifeng
Bai, Yun
Zhu, Jianyang
Xu, Guoqing
Xu, Weiming
Abstract
An X80-grade pipeline steel plate having a low carbon equivalent, a thickness of over 40 mm, and high toughness at low temperatures, the chemical components thereof being, by mass percent: C: ≤ 0.07%, Mn: 1.6-1.9%, Si: ≤ 0.35%, S: ≤ 0.0006%, P: ≤ 0.010%, Nb: 0.045-0.08%, Ti: ≤ 0.012%, V: ≤ 0.008%, Alt: ≤ 0.06%, N: ≤ 0.0040%, O: ≤ 0.004%, Mo: ≤ 0.3%, Pb: ≤ 0.0015%, Zn: ≤ 0.003%, Sb: ≤ 0.0015%, Sn: ≤ 0.0015%, Cu: ≤ 0.30%, Ni: 0.20-2.0%, Cr: 0.12-0.19%, Mo+Cu+Ni+Cr: ≤ 1.8%, Ca: ≤ 0.015%, Ceq: 0.35-0.41%, Pcm: ≤ 0.17%, and the remainder being Fe and unavoidable impurity elements. The thickness of the steel plate is 40 mm or greater. The manufacturing process is as follows: measuring out and preparing materials → performing converter or electric furnace smelting → refining outisde of the furnace → continuous casting → slab reheating → specific TCMP processing + hot straightening + cooling and then stack cooling → final product. In the present application, appropriate ingredients are used to produce X80 steel of 40 mm or greater thickness, and in combination with subsequent specific TCMP processing, obtain excellent low-temperature toughness.
JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO., LTD (China)
Inventor
Liu, Jun
Li, Guozhong
Han, Buqiang
Xu, Xiaohong
Zhu, Tongchun
Ning, Kangkang
Han, Quanjun
Abstract
Disclosed are a large-thickness lamellar tearing-resistant modulated high-strength steel plate with 960 MPa-level yield strength, and a production method therefor. The steel plate includes the following chemical components by weight wt%: C: 0.15-0.20%, Si: 0.10-0.40%, Mn: 0.90-1.30%, Nb: 0.010-0.040%, V: 0.010-0.045%, Ti: ≤ 0.010%, Al: 0.03-0.06%, Ni: 0.50-1.00%, Cu: ≤ 0.1%, Cr: 0.30-0.80%, Mo: 0.20-0.70%, B: 0.001-0.005%, Ca: 0.001-0.005%, P: ≤ 0.010%, S: ≤ 0.002%, O: ≤ 0.002%, N: ≤ 0.004%, and H: ≤ 0.00015%, with the balance being Fe and inevitable impurity elements, and the carbon equivalent (CEV) is 0.58-0.68%. The process steps are: smelting-> external refining-> vacuum degassing-> Ca treatment-> continuous casting-> heating-> rolling-> steel plate slow cooling-> quenching-> tempering. The steel plate has a thickness of 50-100 mm, has excellent comprehensive mechanical properties, a yield strength of ≥ 960 MPa, a tensile strength of ≥ 1000 MPa, a low-temperature Charpy impact work at -40ºC of ≥ 30J, a Z-direction tensile fracture surface shrinking rate of ≥ 35%, and a good resistance to laminar tearing.
JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO., LTD (China)
Inventor
Yin, Jiang
Bao, Xuejun
Liu, Zhenwei
Bai, Yun
Xu, Xiaohong
Zhang, Ming
Fan, Haidong
Li, Yao
Li, Hongli
Chen, De
Zhu, Guorong
Hu, Guoren
Yao, Tiehua
Gu, Qiuhao
Cui, Yong
Huang, Erxin
Liu, Xuewen
Li, Liangliang
Abstract
The present invention relates to a kind of R6 high toughness offshore mooring chain steel applicable to anchor moored positioning cathodic protection floating body and a mooring chain thereof. The chemical elements comprise C 0.18~0.24%, N 0.006~0.024, P, S, Si, Mn, Cr, Ni, Mo, Cu, Al, Ti, V, Nb, Ca, O≤0.0015, H≤0.00015, Fe and impurity elements, wherein 0.22≤(C+N)≤0.26; the total quantity of alloy ∑M=(Si+Mn+Cr+Ni+Mo+Cu), 3.4≤∑M≤6.8; and the total quantity of microalloy ∑MM=(Ti+Al+Nb+V), 0.065≤∑MM≤0.194. Under the premise of maintaining the high toughness and low corrosion rate of the steel, the present invention adjusts the corrosion potential so as to avoid hydrogen evolution embrittlement caused by cathode over protection. According to the present invention, V is merely used for intensifying, thereby realizing the enhancement of N content in VCN; the chain quenching temperature is raised such that M3C, M2C and VCN in the steel melt sufficiently and are sufficiently precipitated during tempering, thereby improving the precipitation strengthening effect and offsetting the mechanical property weakening possibly caused by limiting the alloy content. Therefore, the present invention relates to composite bainite R6 chain steel and a chain having low crack sensitivity and small difference between superficial and internal structures and properties.
JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO., LTD (China)
Inventor
Zhang, Lin
Zhang, Jianfeng
Lu, Changhe
Guan, Yuehui
Li, Guozhong
Xu, Xiaohong
Bai, Yun
Zong, Hao
He, Jiagfeng
Chen, De
Huang, Zhen
Yang, Jia
Abstract
Disclosed is a controlled cooling and controlled rolling method for control over a bearing steel wire carbide network, the method comprising rapidly rolling a bar into a wire with a specified specification, subjecting same to spinning so as to give a scattered roll, with the final rolling temperature being controlled to be 780ºC-880ºC, and the spinning temperature being controlled to be 750ºC-850ºC; subjecting the continuous scattered roll to on-line controlled cooling through EDC water bath isothermal quench cooling, with the cooling speed being controlled to be 2.0 ºC/s-10 ºC/s, and the final cooling temperature being controlled to be 620ºC-630ºC; cover-adding slow cooling same after the EDC water bath isothermal quench cooling, with the temperature when the scattered roll is taken out from a cover being controlled to be 400ºC-500ºC; and collecting the roll after the slow cooling, and air cooling same to normal temperature. By subjecting a disc roll, subjected to controlled rolling, to controlled cooling through the method of EDC water bath isothermal quench cooling and cover-adding slow cooling, precipitation of a carbide in the cooling process can be effectively inhibited, a non-equilibrium microstructure is obtained, a small-strip-shaped or hemispheric carbide is formed, and finally, a carbide network is controlled.
JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO., LTD (China)
Inventor
Chen, Min
Li, Feng
Xu, Xiaohong
Geng, Ke
Bai, Yun
Huang, Zhen
Yin, Qing
Zhai, Jiaolong
Abstract
Steel for a wind turbine main shaft bearing and a production method therefor. The steel comprises the following chemical compositions: C: 0.10-0.30%; Si: 0.10-0.50%; Mn: 0.30-0.80%; Cr: 1.30-1.60%: S: less than or equal to 0.025%; P: less than or equal to 0.025%; Ni: 3.25-3.75%; Cu: less than or equal to 0.30%; Mo: 0.15-0.25%; Al: 0.005-0.05%; N: 0.005-0.015%; Ca: less than or equal to 0.0010%; Ti: less than or equal to 0.003%; O: less than or equal to 0.0015%; As: less than or equal to 0.04%; Sn: less than or equal to 0.03%; Sb: less than or equal to 0.005%; Pb: less than or equal to 0.002%; and the balance of Fe and inevitable impurities. The production method comprises liquid steel smelting, large cross-section continuously casting large billets using a CCM, continuous rolling and finishing, and slow cooling and softening annealing the continuously casting billets. Steel is high in purity, shows tissue uniformity and compact density, can replace electroslag steel, and meets the requirements of steel for wind turbine main shaft bearings.
JIANGYIN XING CHENG SPECIAL STEEL WORKS CO., LTD (China)
Inventor
Miao, Pifeng
Qian, Gang
Liu, Guanyou
Chen, Liang
Wu, Xiaolin
Li, Jingtao
Gao, Zhuzhong
Ruan, Xiaojiang
Abstract
The present invention relates to a rack steel plate with a thickness up to 177.8 mm by a continuous casting slab, the constituents and mass percentages including C0.11˜0.15%, Si0.15˜0.35%, Mn0.95˜1.25%, P≤0.010%, S≤0.002%, Cr0.45˜0.75%, Mo0.4˜0.6%, Ni1.3˜2.6%, Cu0.2˜0.4%, Al0.06˜0.09%, V0.03˜0.06%, Nb≤0.04%, N≤0.006%, B0.001˜0.002%, the balance is Fe and unavoidable impurity elements. The manufacture method includes, in sequence, KR molten steel pretreatment, converter smelting, LF refining, RH refining, continuous casting through a straight-arc continuous casting machine, shielding the continuous casting slab a cover and slowly cooling, cleaning the continuous casting slab, heating, high-pressure water descaling, control rolling, straightening, slowly cooling, quenching and tempering treatment. The rack steel plate of large thickness in present invention has advantages of high strength, good plasticity and excellent toughness at a low temperature, the process method has advantages of simple process, low cost and efficiently quick etc.
JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO., LTD (China)
Inventor
Liu, Jigang
Chen, Yuhui
Xu, Guoqing
Song, Yancheng
Zhang, Weiwei
Li, Zhongping
Abstract
An online system for measuring the thickness of and adjusting a rolling reduction amount of a continuous casting slab, characterized by: comprising an online continuous casting slab distance measurement apparatus, a casting slab thickness feedback system and a continuous casting machine rolling reduction adjustment system, wherein the online continuous casting slab distance measurement apparatus, which is fixed above a slab drawing section of a continuous casting machine, measures the distance from a source point to each specified point of a casting slab at a certain frequency; the casting slab thickness feedback system is used to calculate the thickness of the casting slab according to the measured distance, and then feed a result back to a secondary system of a continuous casting system; and the current continuous casting machine rolling reduction adjustment system is used to adjust a rolling reduction amount.
JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO., LTD (China)
Inventor
Jiang, Changlin
Xu, Xiaohong
Chu, Jianyang
Xu, Guoqing
Lin, Tao
Wu, Xiaolin
Hu, Jianguo
Pan, Yueming
Abstract
A high carbon equivalent and high low-temperature toughness pipeline steel plate for an X80 elbow pipe and a manufacturing method therefor. The method has the characteristics of simple process and high yield. The thickness of the steel plate is 18.4-42 mm. The manufacturing process is as follows: preparing materials according to proportions; smelting same by a converter or an electric furnace; refining same outside the converter or furnace; performing continuous casting; reheating a plate blank; performing rolling, and ACC gradient cooling; and straightening. The steel plate has excellent low-temperature toughness; the manufacturing method therefor is simple and easy, and brings high yield.
JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO., LTD (China)
Inventor
Jiang, Changlin
Gao, Zhuzhong
Chu, Jianyang
Lin, Tao
Wang, Xiao
Zhu, Renchao
Hu, Jianguo
Abstract
A pipeline steel plate for an HIC-resistant X80 elbow pipe. The chemical components of the pipeline steel plate, by mass percentage, are: C: ≤ 0.10%; Mn: 1.45-1.80%; Si: ≤ 0.45%; S: ≤ 0.001%; P: ≤ 0.010%; Nb: 0.045-0.08%; Ti: ≤ 0.012%; V: ≤ 0.008%; Alt: ≤ 0.06%; N: ≤ 0.0040%; O: ≤ 0.004%; Mo: ≤ 0.40%; Pb ≤ 0.0015%; Zn ≤ 0.003%; Sb ≤ 0.0015%; Sn ≤ 0.0015%; Cu: ≤ 0.30%; Ni: 0.20-1.5%; Cr: ≤ 0.35%, wherein Mo + Cu + Ni + Cr ≤ 1.5%, and Ca/S ≥ 1; Ceq: 0.43-0.54%; Pcm: 0.19 - 0.27%; and the balance of Fe and inevitable impurities. The manufacturing method comprises: preparing materials according to proportions; smelting the materials by a converter or an electric furnace; refining same outside the converter or the electric furnace; performing continuous casting; reheating a plate blank; performing a particular TMCP process and stack cooling after water cooling; and straightening. The particular TMCP comprises two-phase rolling and intermediate blank cooling.
JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO., LTD (China)
Inventor
Sun, Xianjin
Gao, Zhuzhong
Hu, Jianguo
Li, Jingtao
Miao, Pifeng
Wu, Xiaolin
Shi, Ailai
Zhao, Fu
Xu, Feng
Fang, Shouyu
Abstract
An ultra-heavy steel plate with low cracking sensitivity and low yield ratio, the mass percentages of chemical components of the steel plate are C 0.05-0.09; Si 0.2-0.4; Mn 1.3-1.6; Al 0.02-0.04; Nb 0.03-0.08; V 0.03-0.08; Cr 0.1-0.5; Ni 0.1-0.5; Mo 0.1-0.3; Cu 0.2-0.5; Ti 0.01-0.02; P≤0.015; S≤0.003; N≤0.007, the balance being Fe and inevitable impurities; the carbon equivalent is ≤0.43, the cold cracking sensitivity coefficient Pcm is ≤0.20. A low cracking sensitivity and low yield ratio steel plate with a thickness of 40-70 mm is manufactured by the process steps of KR molten iron pretreatment-converter smelting-LF refining-RH vacuum degassing-continuous casting-lid-covering slow cooling for the continuous casting slabs-casting slabs heating-controlled rolling-controlled cooling-hot straightening-air cooling and so on.
JIANG YIN XING CHENG SPECIAL STEEL WORKS CO., LTD (China)
Inventor
Miao, Pifeng
Liu, Guanyou
Chen, Liang
Xu, Xiaohong
Wu, Xiaolin
Li, Jingtao
Gao, Zhuzhong
Abstract
A marine atmosphere corrosion resisting and seawater splashing corrosion resisting F690 steel plate with a thickness of 210 mm and easy to weld, and a preparation method therefor. With Fe as the basic element, the marine atmosphere corrosion resisting and seawater splashing corrosion resisting F690 steel plate with a thickness of 210 mm and easy to weld further comprises chemical components of: C: 0.11%-0.14%; Si: 0.15%-0.35%; Mn: 0.9%-1.15%; P: ≤ 0.006%; S: ≤ 0.002%; Cr: 0.55%-0.75%; Mo: 0.4%-0.6%; Ni: 3.65%-4.0%; Cu: 0.2%-0.4%; Al: 0.06%-0.10%; V: 0.03%-0.06%; Nb: 0.015%-0.04%; N: ≤ 0.007%; H: ≤ 0.00015%; B: 0.0008%-0.002%; Ca: 0.001%-0.005%; and impurity elements, wherein Ca/S ≥ 1, Al ≥ (Mn/C) × (%N), and the carbon equivalent CEV ≤ 0.82%. The steel plate has high mechanical performance and good marine atmosphere corrosion resistance and seawater splashing corrosion resistance, and is excellent in comprehensive performance.
JIANG YIN XING CHENG SPECIAL STEEL WORKS CO., LTD (China)
Inventor
Ji, Ling
Xu, Xiaohong
Huang, Zhen
Shao, Shuyan
Liu, Xuewen
Kong, Xiangwei
Hu, Shaoxin
Zhang, Xudong
Abstract
A high hardenability, medium carbon, low alloy round steel for fasteners, wherein the chemical composition by mass percentage is as follows: C: 0.36-0.44%, Si: 0.15-0.40%, Mn: 0.80-1.00%, Cr: 1.00-1.15%, Mo: 0.05-0.25%, Ni: 0.05-0.25%, Cu: 0.05-0.25%, Al: 0.015-0.050%, B: 0.0010-0.0050%, Ti: 0.020-0.050%, the remainder being Fe; the maximum diameter of the round steel is 65 mm. Production process: converter smelting, ladle furnace (LF) refining, RH/VD degassing, Ti line and ferroboron feeding, continuous casting, rolling into bars, obtaining quenched and tempered round steel by means of quenching and tempering treatment, the quenched and tempered round steel may be used directly for processing fasteners which meet the ISO 898-1 standard for property class 10.9, such as bolts and the like.
JIANG YIN XING CHENG SPECIAL STEEL WORKS CO., LTD (China)
Inventor
Hu, Shaoxin
Xu, Xiaohong
Shao, Shuyan
Huang, Zhen
Nie, Aichen
Ji, Ling
Zhu, Guorong
Abstract
The invention provides a process for producing an LS-CrNiMo30C steel forging using a continuous casting billet, for use in a subsea oil production wellhead device. A forged round steel bar is produced employing a Φ600 mm continuous casting round billet. The process includes steps of smelting molten steel, continuous casting, forging, annealing, cooling, and the like. A temperature ramp rate when heating the casting billet during forging is ≤ 200ºC/h, a forging heating temperature is 1200-1250ºC, a primary forging temperature is higher than 1150ºC, and the final forging temperature is not less than 850ºC. After being removed from the production line, the forgings are slowly cooled in a sand pit under a high temperature of ≥ 500ºC. After the temperature decreases to below 200ºC, the forgings are removed from the sand pit and slowly cooled.
JIANG YIN XING CHENG SPECIAL STEEL WORKS CO., LTD (China)
Inventor
Tan, Jianping
Qian, Gang
Chen, Yuhui
Xu, Guoqing
Han, Quanjun
Ji, Xiumei
Rao, Lihua
Du, Jianfeng
Abstract
A continuous casting process for producing a 450 mm ultra-thick blank on a straight arc continuous casting machine, comprising: adjusting a specification range of a casting blank, using a large tundish, performing a dummy sealing operation, and centering a tundish nozzle; injecting qualified molten steel into the large tundish; adding a tundish covering agent into the molten steel; selecting mold protecting slag suitable for the molten steel; performing cold steel quenching and slag adding operations on a molten steel level in a mold, the typical pull speed being controlled within 0.30-0.55 m/min, the typical superheat temperature being controlled within 20-30°C. A mold expert system is used for avoiding the risk of steel leakage in a casting process, and dynamic secondary cooling technology and dynamic soft reduction technology are used for preventing straightening cracks from being generated in the casting process. The continuous casting process solves the problems of bulging and straightening cracks that may easily occur during the casting of an ultra-thick blank, such as a 450 mm blank, thereby improving the production efficiency and greatly reducing the costs.
JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO., LTD. (China)
Inventor
Liu, Haikuan
Li, Jingtao
Zhang, Jian
Yun, Pengcheng
Zhang, Jun
Abstract
A pressure vessel steel plate resistant against hydrogen-induced cracking and manufacturing method thereof. The chemical composition of the steel plate, by mass percentage, is: C: 0.16-0.20%; Si: 0.15-0.40%; Mn: 1.05-1.20%; P: ≤ 0.008%; S: ≤ 0.002%; Nb: ≤ 0.01%; V: ≤ 0.01%; Ti: ≤ 0.01%; B: ≤ 0.005%; and the remainder of Fe and unavoidable impurities. The steel plate has a carbon equivalent (Ceq) ≤ 0.42%, determined using the equation: Ceq = C + Mn / 6 + (Cr + Mo + V) / 5 + (Ni + Cu) / 15.
JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO., LTD (China)
Inventor
Chen, Min
Li, Feng
Yin, Qing
Zhai, Jiaolong
Geng, Ke
Zhang, Jianfeng
Huang, Zhen
Bao, Jian
Ruan, Xiaojiang
Abstract
A microalloyed steel for a car carbon wheel hub bearing, comprising chemical components: 0.45-0.70％ of C, 0.10-0.50％ of Si, 0.30-0.70％ of Mn, 0.20-0.60％ of Cr, less than or equal to 0.025％ of P, 0.003-0.030％ of S, less than or equal to 0.1％ of Mo, less than or equal to 0.2％ of Ni, less than or equal to 0.04％ of Al, less than or equal to 0.3％ of Cu, less than or equal to 0.001％ of Ca, less than or equal to 0.003％ of Ti, less than or equal to 0.001％ of O, less than or equal to 0.04％ of As, less than or equal to 0.03％ of Sn, less than or equal to 0.005％ of Sb, less than or equal to 0.002％ of Pb, and the balance being Fe and inevitable impurities. The manufacturing procedure is an electric furnace or a converter-seconclary refining-VD or RH vacuum degassing-continuous casting-continuous rolling-sawing-stack cooling-finishing-surface and internal flaw detection-packing.
06 - Common metals and ores; objects made of metal
40 - Treatment of materials; recycling, air and water treatment,
Goods & Services
(1) Unwrought or semi-wrought steel; steel alloys; white metal; metal billets; alloys of common metal; metal pipes for liquid and gas transfer; stainless steel water pipes; metal reinforcement materials for building; steel rails; steel wire; wire of common metal. (1) Metalworking; metal tempering; heat treatment of metals; blacksmithing; metal casting; metal fabrication and finishing services; soldering; laminating; destruction of waste; recycling of waste and trash.
06 - Common metals and ores; objects made of metal
40 - Treatment of materials; recycling, air and water treatment,
Goods & Services
Common metals, unwrought or semi-wrought; steel sheets;
steel strip; blooms; iron strip; angle irons; alloys of
common metal; steel alloys; ingots of common metal; bronze. Metal smithing; metal tempering; metal casting; refining
services; soldering; laminating; waste treatment
(transformation); environmental remediation services,
namely, soil, waste and/or water treatment services.
06 - Common metals and ores; objects made of metal
Goods & Services
Common metals, unwrought or semi-wrought, steel sheets,
steel strip, blooms, iron strip, angle irons, alloys of
common metal, steel alloys, ingots of common metal, bronze.
40 - Treatment of materials; recycling, air and water treatment,
Goods & Services
Smithing; metal tempering; metal casting; soldering; metal laminating; waste treatment; environmental remediation services, namely, soil, waste and/or water treatment services
06 - Common metals and ores; objects made of metal
Goods & Services
Steels in the form of sheets, plates, foils and reels, alloys used for casting, ingots of common metal, steel plates and sheets, clad steel plates and sheets, casting alloys
