Abstract

A production method for a marine atmospheric corrosion-resistant steel sheet. Steel comprises the following components in percentage by weight: C: 0.03-0.08%; Si: 0.15-0.30%; Mn: 0.60-1.50%; P: ≤0.025%; S: ≤0.010%; Al: 0.020-0.050%; Ti: 0.007-0.030%; Nb: 0.010-0.060%; Cu: 0.20-0.50%; Ni: 0.50-3.50%; Cr: ≤0.50%; and Mo: ≤0.30%, and the balance being Fe and inevitable impurity elements. The key process steps comprise heating, rolling, cooling, surface treatment and heat treatment. In the present invention, by controlling the iron oxide scale and the rusty scale on the surface of a casting blank and a steel sheet, the steel sheet can quickly obtain a phosphate, nitrate or chromate protective film layer having strong adhesion and a uniform and stable nickel, chromium, copper or calcium-containing oxide layer protective film; in the use and service process of the steel sheet, rust liquid sagging is prevented, and the effect of stopping rust with the rusty scale is achieved.

IPC Classes  ?

• C21D 8/02 - Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
• 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 38/14 - Ferrous alloys, e.g. steel alloys containing titanium or zirconium
• C22C 38/12 - Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium or niobium
• C22C 38/16 - Ferrous alloys, e.g. steel alloys containing copper
• C22C 38/08 - Ferrous alloys, e.g. steel alloys containing nickel
• C22C 38/50 - Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
• C22C 38/48 - Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
• C22C 38/42 - Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
• C22C 38/44 - Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
• C23C 22/05 - Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
• C23C 22/78 - Pretreatment of the material to be coated
• C23C 22/76 - Applying the liquid by spraying
• C23C 22/82 - After-treatment
• B21B 37/74 - Temperature control, e.g. by cooling or heating the rolls or the product
• B21B 45/08 - Devices for surface treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling hydraulically

Abstract

A production method for an atmospheric-corrosion-resistant steel plate. The steel comprises the following components, in percentages by weight: C=0.03-0.08%, Si≤0.60%, Mn=0.50-1.50%, P≤0.025%, S≤0.005%, Al=0.01-0.06%, Cu=0.30-0.60%, Ni=0.30-1.0%, Cr=0.30-0.60%, Mo≤0.50%, wherein one or a mixture of more of Ti≤0.03%, Nb≤0.10% and V≤0.10% can be added, with the balance being Fe and inevitable impurity elements. The key process steps comprise heating, rolling, cooling and finishing. A layer of compact and uniform oxide scale with extremely strong adhesion can be obtained by means of controlled rolling and controlled cooling processes, which layer can have the function of "stopping rust with rust", such that the atmospheric corrosion resistance of the steel plate is improved; in addition, since the steps are simple, and no heat treatment, rust layer stabilizing treatment, etc., are needed, the delivery time of the steel plate is greatly shortened, and the production cost is reduced. The method is a green production method.

IPC Classes  ?

• B21B 1/22 - 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 bands or sheets of indefinite length
• B21B 15/00 - Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
• B21B 45/08 - Devices for surface treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling hydraulically
• 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 38/44 - Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
• C22C 38/46 - Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
• C22C 38/48 - Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
• C22C 38/50 - Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
• C23C 8/10 - Oxidising

Abstract

A production method for a high-strength, high-toughness and weather-resistant bridge steel plate. The steel comprises the following components, in percentages by weight: C=0.05-0.08%, Si=0.10-0.30%, Mn=1.20-1.50%, P≤0.015%, S≤0.005%, Al=0.020-0.050%, Ti=0.010-0.030%, Nb=0.030-0.050%, Cu=0.30-0.50%, Ni=0.30-0.60%, Cr=0.40-0.60%, Mo=0.10-0.20%, and the balance of Fe and inevitable impurity elements. By means of heating, rolling, cooling, finishing and heat treatment processes, a layer of compact and uniform oxide scale with extremely high adhesion is obtained on the surface of the steel plate, which layer can have the function of "stopping rust with rust", such that the atmospheric corrosion resistance of the steel plate is improved. In addition, the steel plate further has high strength and toughness, the yield strength is larger than or equal to 500 MPa, the tensile strength is larger than or equal to 650 MPa, and the -40ºC impact absorbing energy is larger than or equal to 120 J. The method can be used for manufacturing and exposing bridge steel structures.

IPC Classes  ?

• C21D 8/02 - Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
• 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 38/44 - Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
• C22C 38/48 - Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
• C22C 38/50 - Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
• C21D 6/00 - Heat treatment of ferrous alloys

Abstract

A production method for a high-nickel medium-thick steel plate for low-temperature service. The steel comprises the following components in percentage by weight: C: 0.05-0.08%; Si≤0.30%; Mn: 0.50-0.80%; P≤0.008%; S≤0.005%; Al: 0.02-0.05%; Ni: 3.0-4.0%; Sb≤0.003%; B≤0.0005%; O≤0.0015%; N≤0.0050%; H≤0.0002%; Cu+Cr+Mo≤0.08%; and Ti+Nb+V≤0.01%, with the balance being Fe and inevitable impurity elements. The key process steps comprise smelting, continuous casting, heating, rolling, cooling, surface treatment and heat treatment. According to the present invention, hot delivery and hot charging technology is used, and by controlling iron oxide scale on the surfaces of a plate blank and a steel plate, the surface quality of the obtained high-nickel steel plate for low-temperature service is good; moreover, the steel plate has excellent low-temperature toughness, and the Charpy impact absorbed energy at -100°C is greater than or equal to 60 J.

IPC Classes  ?

• C22C 33/04 - Making ferrous alloys by melting
• 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 38/08 - Ferrous alloys, e.g. steel alloys containing nickel