Abstract

The present invention relates to the technical field of seamless pipe machining, and in particular to a preparation method for a nickel-molybdenum corrosion-resistant alloy seamless pipe and the prepared seamless pipe. The weight proportions of components of the nickel-molybdenum corrosion-resistant alloy are: C≤0.01%, Si≤0.10%, Mn≤3.0%, Cr≤3.0%, Mo (26.0-32.0)%, Ni≥65.0%, W≤3.0%, with the balance being trace elements. According to the present invention, a process of cladding hot extrusion in combination with cold rolling is used, and a machining process is optimized, so that the outer diameter of the prepared nickel-molybdenum corrosion-resistant alloy seamless pipe is generally not larger than 100 mm, the wall thickness is not larger than 8 mm, and the pipe structure has good uniformity, mechanical properties, and corrosion resistance, and high yield, can be used in the fields of chemistry, petrochemistry, energy manufacturing, pollution control, etc., and has wide market application prospects. In addition, the machining process in the present invention can also be used for preparing other alloy seamless pipes that are difficult to deform and prone to oxidize, and can further be used for preparing powder nickel-based alloy pipes, etc.

IPC Classes  ?

• B21C 37/06 - Manufacture of metal sheets, rods, wire, tubes, profiles or like semi-manufactured products, not otherwise provided forManufacture of tubes of special shape of tubes or metal hosesCombined procedures for making tubes, e.g. for making multi-wall tubes
• C22F 1/10 - Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of nickel or cobalt or alloys based thereon

Abstract

High-strength CO2 corrosion-resistant stainless steel, an oil casing, and a preparation method therefor. The stainless steel comprises: C≤0.1%, 0.1%≤Si≤0.5%, 1.5%≤Mn≤5%, 16.5%≤Cr≤25.0%, 8.0%≤Ni≤20.0%, 1.5%≤Mo≤5%, 0.01%≤Al≤0.10%, 0.30%≤Cu≤0.45%, Co≤0.5%, 0.01%≤W≤2.00%, 0.05%≤N≤0.3%, and 0.05%≤Re≤0.10%, the balance being Fe and other unavoidable impurities. The components meet the conditions of: Creq/Nieq<2.0 and PREN≥25, where Nieq is the nickel equivalent, Creq is the chromium equivalent, and PREN is the pitting resistance equivalent. By means of controlling nitrogen content and adjusting other constituent components, the performance of 300 series austenitic stainless steel is greatly improved compared with existing 300 series austenitic stainless steels, in particular having excellent resistance to CO2 corrosion and excellent resistance to fracture acidizing fluid corrosion. The properties of the material meet the requirements for the development of oil and gas wells in high-temperature, high-pressure, and high-CO2 environments.

IPC Classes  ?

• C22C 38/02 - Ferrous alloys, e.g. steel alloys containing silicon
• C22C 38/04 - Ferrous alloys, e.g. steel alloys containing manganese
• C22C 38/06 - Ferrous alloys, e.g. steel alloys containing aluminium
• C22C 38/42 - Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
• C22C 38/52 - Ferrous alloys, e.g. steel alloys containing chromium with nickel with cobalt
• C22C 38/44 - Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
• C22C 38/00 - Ferrous alloys, e.g. steel alloys
• C22C 33/04 - Making ferrous alloys by melting
• B21C 37/06 - Manufacture of metal sheets, rods, wire, tubes, profiles or like semi-manufactured products, not otherwise provided forManufacture of tubes of special shape of tubes or metal hosesCombined procedures for making tubes, e.g. for making multi-wall tubes
• C21D 8/10 - Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies

Abstract

A coincidence site lattice (CSL) grain boundary austenitic stainless steel, and a seamless steel elbow and a manufacturing method therefor. The austenitic stainless steel comprises: 0.03%≤C≤0.06%, 19.0%≤Cr≤20.0%, 9.5%≤Ni≤11.0%, and the other components being raw materials satisfying ASME SA213M-TP304 standard requirements. The interior of the austenitic stainless steel contains a CSL grain boundary structure. By simultaneously controlling the content of carbon and a solution heat treatment temperature, the formation of a CSL structure in the austenitic stainless steel can be accurately controlled, so that the corrosion-resistant effect of the TP304 austenitic stainless steel is greatly improved compared with existing TP304 austenitic stainless steel, and the TP304 austenitic stainless steel has a higher corrosion-resistant effect when being used as a ship structure material, and thus, the TP304 austenitic stainless steel can be used for manufacturing a corrosion-resistant seamless steel elbow in the ship structure material.

IPC Classes  ?

• C22C 38/02 - Ferrous alloys, e.g. steel alloys containing silicon

Abstract

A high-strength and high-corrosion-resistant oil well pipe steel, and a preparation method therefor, which belong to the technical field of corrosion-resistant steel, and solve the problems of the high cost of oil well pipe steel in the prior art, and the difficulty in taking both high strength and high corrosion resistance into consideration. The preparation method for an oil well pipe steel includes: step 1: smelting a metal raw material into molten steel; step 2: smelting the molten steel into a continuous casting blank or a cast ingot; step 3: forging and cogging the continuous casting blank or the cast ingot to prepare a forged blank, and hot-rolling the forged blank into a hot-rolled plate; and step 4: subjecting the hot-rolled plate to solid solution treatment, performing quantitative cold rolling on the hot-rolled plate, which has been subjected to the solid solution treatment, by a deformation amount of 5-25%, and finally, preparing an oil well pipe steel having a mixed structure of three phases of ferrite + austenite + martensite. The oil well pipe steel prepared by means of the preparation method has a high strength, good ductility and toughness, and good corrosion resistance.

IPC Classes  ?

• C21D 8/02 - Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
• C21D 6/00 - Heat treatment of ferrous alloys
• C22C 33/04 - Making ferrous alloys by melting
• C22C 38/44 - Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
• C22C 38/58 - Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
• C22C 38/04 - Ferrous alloys, e.g. steel alloys containing manganese
• C22C 38/02 - Ferrous alloys, e.g. steel alloys containing silicon
• B21B 3/02 - Rolling special iron alloys

Abstract

A highly corrosion-resistant oil well steel pipe and a preparation method therefor, relating to the technical field of corrosion-resistant steel, and used for solving the problems in the prior art of high alloy element content and high costs of an oil well steel pipe. The highly corrosion-resistant oil well steel pipe comprises the following components in percentage by mass: C: ≤0.03%; Cr: 17.3%-18.4%; Mo: 0.5%-2.0%; Ni: 1.0%-2.8%; Mn: 1.0%-3.5%; Si: 0.1%-0.5%; N: 0.1%-0.25%; P: ≤0.03%; S: ≤0.01%; and the remainder being Fe and inevitable impurities. The oil well steel pipe has high strength, good plasticity and toughness, and excellent corrosion resistance.

IPC Classes  ?

• C22C 38/44 - Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
• C22C 38/58 - Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
• C22C 38/04 - Ferrous alloys, e.g. steel alloys containing manganese
• C22C 38/02 - Ferrous alloys, e.g. steel alloys containing silicon
• C22C 33/04 - Making ferrous alloys by melting
• C21D 8/10 - Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies
• B21B 39/00 - Arrangements for moving, supporting, or positioning work, or controlling its movement, combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills

Abstract

The invention discloses a high-precision seamless pipe having a special-shaped hexagonal cross-section with a circle inside for use in nuclear power, which is made of stainless steel or a corrosion-resistant alloy having an elongation rate of more than 35%, has an outer width across flats of 10-68 mm with a tolerance of ±0.05 mm, and has an inner circle diameter of 9-66 mm with a tolerance of ±0.05 mm. Also disclosed is a manufacturing method for the high-precision seamless pipe having a special-shaped hexagonal cross-section with a circle inside for use in nuclear power.

IPC Classes  ?

• B21C 37/06 - Manufacture of metal sheets, rods, wire, tubes, profiles or like semi-manufactured products, not otherwise provided forManufacture of tubes of special shape of tubes or metal hosesCombined procedures for making tubes, e.g. for making multi-wall tubes
• C21D 8/10 - Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies
• C21D 1/26 - Methods of annealing
• C21D 9/08 - Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articlesFurnaces therefor for tubular bodies or pipes
• C21D 1/74 - Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
• C21D 1/773 - Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material under reduced pressure or vacuum

Abstract

A sealing structure and a sealing method for an electrochemical sample (1) used in a high-temperature high-pressure aqueous solution environment, related to the technical fields of electrochemical measurement of corrosion and material characterisation, the sealing structure comprising: a heat shrinkable sleeve (3) sleeved on and wrapping a wire (2), a support rod (5) for the placement of the wire (2) and providing a support function, and a heat shrinkable tube (6) wrapped around the outside of the sample (1), the support rod (5), and the heat shrinkable sleeve (3), the wire (2) being electrically connected to the sample (1), the bottom of the support rod (5) being in sealed contact with the sample (1), the heat shrinkable sleeve (3) and the heat shrinkable tube (6) being made of polytetrafluoroethylene material, and the support rod (5) being made of polyether ether ketone material. By means of a simple process, an electrochemical working electrode capable of use in high-temperature high-pressure aqueous solution environments can be prepared, the operations being easy to execute, and the problem of working electrode packaging in high-temperature high-pressure aqueous solution environments being solved. The metal wire (2) wrapped in heat shrinkable polytetrafluoroethylene and the polyether ether ketone rod (5) can be recycled, saving testing costs.

IPC Classes  ?

• G01N 17/02 - Electrochemical measuring systems for weathering, corrosion or corrosion-protection measurement
• G01N 27/30 - Electrodes, e.g. test electrodesHalf-cells

Abstract

A cold drawing die and production process for a ribbed cladding tube, and a finished tube thereof. The cold drawing die comprises a cold drawing outer die (1) for forming a pipeline outer contour, and a cold drawing core head (2) for limiting an inner diameter of a pipeline. An inner cavity of the cold drawing outer die (1) comprises an inlet section (1.1), a forming section (1.2) and an outlet section (1.3), which are arranged in sequence, wherein the inlet section (1.1) and the outlet section (1.3) are both channels in the shape of a truncated circular cone, and the forming section (1.2) comprises an outer diameter forming hole (a), and at least one section of a rib groove (b) arranged on the periphery of the outer diameter forming hole (a). The cold drawing core head (2) is of a solid structure, and comprises a fixed inner diameter section (2.1), a section in the shape of a truncated circular cone (2.2) and a rear cylindrical section (2.3), which are sequentially arranged. The process comprises: preparation of a pipe to be processed, cold drawing pretreatment, cold drawing forming, pipe cutting and cleaning, and solution treatment and straightening. The die is simple in terms of structure and has a low production cost, and the process thereof has a high production efficiency, produces a good surface quality and a high dimensional precision, and has an excellent comprehensive performance.

IPC Classes  ?

• B21C 1/24 - Metal drawing by machines or apparatus in which the drawing action is effected by means other than drums, e.g. by a longitudinally-moved carriage pulling or pushing the work or stock for making metal sheets, rods or tubes specially adapted for making tubular articles by means of mandrels
• B21C 3/02 - DiesSelection of material thereforCleaning thereof

Abstract

Disclosed is a method for manufacturing an oval seamless steel tube. The method comprises the procedures of intermediate-product cold working, final cold-drawing, heat treatment for a finished product, and a straightening treatment, wherein the procedure of intermediate-product cold working involves cold rolling machining being performed on a circular tube pierced billet, and the ratio of an outer diameter D0 of a final cold-rolled circular tube to a diameter D1, in a long axis direction, of an oval tube is controlled to be 1.10-1.50; the procedure of final cold-drawing uses empty sinking or cold-drawing with a core diameter to cold-draw an intermediate circular tube into the oval tube, wherein the cold-drawing speed is 1.0-10.0 m/min; and black annealing or bright annealing is adopted for heat treatment for the finished product, wherein the annealing temperature is 1050-1100ºC, the heat preservation time is determined according to the wall thickness WT1 of the oval tube, and the heat preservation time is (1.0-3.0)*WT1 min/mm.

IPC Classes  ?

• B21C 37/06 - Manufacture of metal sheets, rods, wire, tubes, profiles or like semi-manufactured products, not otherwise provided forManufacture of tubes of special shape of tubes or metal hosesCombined procedures for making tubes, e.g. for making multi-wall tubes

Goods & Services

Steel alloys; cast steel; steel strip; steel sheets; posts of metal; junctions of metal for pipes; steel pipes; pipes of metal; steel wire; joints of cables of metal, non-electric (terms linguistically incorrect in the opinion of the International Bureau - Rule 13(2)(b) of the Common Regulations).

Goods & Services

Steel alloys; cast steel; steel strip; steel sheets; posts of metal; junctions of metal for pipes; steel pipes; pipes of metal; steel wire; joints of cables of metal, non-electric.

Goods & Services

Seamless stainless steel pipe; stainless steel wire; stainless steel bar.

Goods & Services

Alloy steel; cast steel; steel bars; steel plates; metal braces; metal conduit couplers; steel pipes; metal pipes; steel wire; non-electrical metal cable joints.

Goods & Services

Alloy steel; cast steel; steel bar; steel plate; metal brace; metal conduit coupling; steel pipe; metal pipe; steel wire; non-electrical metal cable joint.

Goods & Services

Seamless stainless steel pipes; stainless steel wire; stainless steel bars.

Goods & Services

(1) Seamless stainless steel products and welded stainless steel products, both for use in manufacturing industries, namely petro-chemical industry, oil and gas industry, chemical industry, paper industry, heat exchanger industry, instrumentation industry, automobile industry, food-processing industry and industries requiring corrosion resistant piping namely: steel alloys, cast steel, steel strips, steel sheets, posts of metal, steel pipes, junctions of metal for pipes, barrels of metal, steel wire; cable joints of metal, non electric.

Goods & Services

Seamless pipes of metal; non-electric cable joints of metal; steel wire; steel rods; pipes of metal for welding. Magnesia fire-proof electric cables; flame-retardant cables; communication cables; control cables; electric power cables.

Goods & Services

Steel pipes; steel wire; steel rods; non-electric cable joints of metal; pipes of metal for welding. Magnesia fire-proof electric cables; flame-retardant cables; communication cables; control cables; electric power cables.

Goods & Services

Pipes of stainless steel (not used for welding); stainless steel wire; stainless steel rods. Magnesia fire-proof electric cables; flame-retardant cables; communication cables; control cables; electric power cables.

Goods & Services

Steel in sheet, rod, bar and billet form, casting alloys, metal alloys for further manufacturing, metal tubes, metal barrels, metal pipes and fittings therefor, metal junctions for pipes, metal staircases, metal railway crossovers, metal cable wire, non-electric multi-strand wire, non-electric single-strand wire, barbed wire, metal expansion joints for floors and walls, metal pipe couplings and joints, metal cable clips, nails, metal fasteners, namely bolts, rivets and screws, metal windows, metal sash fasteners for windows, metal hardware, namely, pulleys, metal window pulleys, door panels of metal, tin cans sold empty, metal containers for the storage and transportation of goods, metal bins, metal name plates, metal holders for signboards, metal hardware, namely, springs, metal hooks, metal brazing rods, metal rods for brazing and welding