A method for manufacturing high-strength, high-weather-resistant cold-rolled dual-phase weather-resistant steel

Abstract

The invention discloses a method for manufacturing a high-strength, high-weather-resistant cold-rolled dual-phase weather-resistant steel, and relates to the technical field of metal plate manufacturing. The production method of the high-strength, high-weather-resistance cold-rolled dual-phase weather-resistance steel, the weight percentage of the chemical composition of the raw materials is: C: 0.008-0.04%, Si: 0.15-0.30%, Mn: 0.20-0.50%, P: ≤0.020% , S: ≤0.01%, Cu: 0.35‑0.45%, Ni: 0.25‑0.40%, Cr: 3.5‑5.0%, Als: 0.025‑0.050%, Ti: 0.010‑0.025%, N: ≤0.0080%, Ca: 0.0015‑0.0035%, the rest is Fe and unavoidable impurities. The production method of the high-strength, high-weather-resistance cold-rolled dual-phase weather-resistance steel adopts reasonable chemical composition design, hot-rolling process control, acid rolling, and continuous annealing process to obtain 1.0mm‑3.0mm cold-rolled high-weather-resistance steel plate with high yield strength 350MPa, tensile strength 500-700MPa, excellent welding performance, relative corrosion rate ≤ 30% (comparison sample Q345B), used for the shell of railway vehicles, so that the steel plate can well adapt to the high-speed development of high-speed trains, so that it is very good Guarantee the weather resistance performance of the train compartment.

Description

technical field [0001] The invention relates to the technical field of metal plate manufacturing, in particular to a method for manufacturing high-strength, high-weather-resistant cold-rolled dual-phase weather-resistant steel. Background technique [0002] With the development of domestic high-speed railways and the increase in the speed of bullet trains, higher requirements have been put forward for the cold-rolled weather resistance of the shell of bullet train carriages. Not only good atmospheric corrosion resistance is required, but also high strength is required to ensure safety. [0003] The current railway vehicles use common weather-resistant cold-rolled products (Q310NQL2) to prepare motor car carriages, and the relative corrosion rate of this product is only 60% (using the relative corrosion rate in the method of the iron standard "TB_2375-1993 Periodic Infiltration Corrosion Test Method for Weather-resistant Steel for Railways" ), and its yield strength is requir...

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Problems solved by technology

[0005] Aiming at the deficiencies in the prior art, the present invention provides a method for manufacturing high-strength, high-weather-resistant cold-rolled dual-phase weather-resistant steel, which solves the problem that the common weather-resistant cold-rolled product (Q310NQL2) used in existing railway vehicles is used to prepare motor car carriages. The corrosion rate is only 60% (using the relative corrosion rate in the iron standard "TB_2375-1993 Railway Weathering Steel Periodic Infiltration Corrosion Test Method"), and its yield strength is required to be ≥ 310MPa, which is difficult to adapt to the high-speed development of high-speed trains , the strength of the steel plate is not good, and the weather resistance of the train compartment cannot be well guaranteed

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