High-strength and high-weather-resistance cold-rolled dual-phase weather-resistant steel and manufacturing method thereof

Abstract

The invention discloses high-strength and high-weather-resistance cold-rolled dual-phase weather-resistant steel and a manufacturing method thereof, and relates to the technical field of metal plate manufacturing. The high-strength and high-weather-resistance cold-rolled dual-phase weather-resistant steel comprises the following chemical components in percentage by weight: 0.008-0.04% of C, 0.15-0.30% of Si, 0.20-0.50% of Mn, less than or equal to 0.020% of P, less than or equal to 0.01% of S, 0.35-0.45% of Cu, 0.25-0.40% of Ni, 3.5-5.0% of Cr, 0.025-0.050% of Als, 0.010-0.025% of Ti, equal toor less than 0.0080% of N, 0.0015-0.0035% of Ca and the balance of Fe and unavoidable impurities. According to the high-strength and high-weather-resistance cold-rolled dual-phase weather-resistant steel and the manufacturing method thereof, a 1.0 mm to 3.0 mm cold-rolled high-weather-resistance steel plate is obtained through reasonable chemical component design, hot rolling process control, acid rolling and continuous annealing processes, the material yield strength is higher than 350 MPa, the tensile strength is 500-700 MPa, the welding performance is excellent, and the relative corrosionrate is smaller than or equal to 30% (contrast sample Q345B), and the1.0 mm to 3.0 mm cold-rolled high-weather-resistance steel plate is used for the shell of a railway car, therefore, the steel platecan well adapt to high-speed development of high-speed trains, and the weather resistance of bullet train carriages is well guaranteed.

Description

technical field [0001] The invention relates to the technical field of metal sheet manufacturing, in particular to a high-strength, high-weather-resistant cold-rolled dual-phase weather-resistant steel and a manufacturing method thereof. 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] Existing railway vehicles adopt 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 iron standard "TB_2375-1993 Periodic Infiltration Corrosion Test Method for Weather-resistant Steel for Railways" ), and its yield strength is r...

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Problems solved by technology

[0005] Aiming at the deficiencies of the prior art, the present invention provides a high-strength, high-weather-resistance cold-rolled dual-phase weather-resistant steel and a manufacturing method thereof, 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 relative 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 of high-speed trains Development, 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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