Automobile ultra-high formability 980mpa cold-rolled continuous strip steel plate and preparation method
A 980mpa, formability technology, applied in the field of metal materials, can solve the problems of failure to produce and meet, and achieve the effect of taking into account the advantages of forming, high flanging and high drawing, yield and high
Active Publication Date: 2022-07-22
ANGANG STEEL CO LTD
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Problems solved by technology
However, it is obvious that the alloy design and the application of the manufacturing process of these products have failed to produce cold-rolled products that take into account both high yield ratio and elongation, that is, they are only suitable for parts with high drawing requirements in actual part forming applications. Formed parts that cannot meet the requirements of high flanging and high drawing such as engine side beams and comprehensive solutions for the lower end of A-pillars
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[0049] The present invention will be further illustrated by the following examples.
[0050] In the embodiment of the present invention, smelting, hot rolling, pickling, cold rolling, and continuous annealing are performed according to the component distribution ratio of the technical solution.
[0051] (1) Hot rolling: the heating temperature is 1230-1280°C, the rolling temperature is 1060-1150°C, the final rolling temperature is 950-1000°C, and the coiling temperature is 450-500°C;
[0052] (2) Cold rolling: rolling reduction rate of 54% to 63%;
[0053] (3) Continuous annealing: First, the cold-rolled steel sheet is heated to 800-870°C at 2-10°C / s, isothermally for 50-240s; then, the steel sheet is slowly cooled to 660°C at a cooling rate of 0.5-4°C / s ~710℃; then in the rapid cooling stage, the steel plate is quenched at a cooling rate of 30~35℃ / s to 220~280℃, and then heated to an overaging temperature of 360~450℃ at a heating rate of ≥10℃ / s, and the isothermal temperatur...
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Abstract
The invention provides an automobile ultra-high formability 980MPa grade cold-rolled continuous stripping steel sheet and a preparation method. The composition of the steel sheet in terms of weight percentage is as follows: C: 0.18%-0.24%, Si: 1.5%-2.0%, Mn: 1.8%~2.5%, Ti: 0.01%~0.03%, P≤0.02%, S≤0.005%, the balance is Fe and inevitable impurities. The preparation method includes smelting, casting, hot rolling, pickling, cold rolling and continuous annealing; the yield strength of the steel sheet produced by the invention is over 700 MPa, the tensile strength is over 980 MPa, the yield strength ratio is over 0.65, the elongation after fracture is over 25%, and the expansion ratio is over 25%. The hole value is more than 40%.
Description
technical field [0001] The invention belongs to the field of metal materials, and in particular relates to a cold-rolled continuous stripping steel sheet with ultra-high formability of 980 MPa for automobiles and a preparation method thereof. In particular, the elongation after fracture of the steel plate is 25% (A 80 ) or higher and a hole expansion ratio of 40% or higher, an advanced high-strength steel sheet for automobiles with ultra-high formability. Background technique [0002] Advanced high-strength steel for automobiles has always been the main material for automobile body-in-white due to its mature production process and low manufacturing cost. At present, the advanced high-strength steels widely used in the body are concentrated in the first and second generation, representing the steel types with or without interstitial steel (IF), low-alloy high-strength steel (HSLA), dual-phase steel (DP), etc. On the body cover and structural parts, the strength covers from ...
Claims
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IPC IPC(8): C22C38/04C22C38/02C22C38/14C22C38/12C22C38/16C22C38/38C22C38/34C22C38/32C22C38/22C22C38/20C22C38/28C22C38/26C22C38/24C21D8/02C21D1/18
CPCC22C38/04C22C38/02C22C38/14C22C38/12C22C38/16C22C38/38C22C38/34C22C38/32C22C38/22C22C38/20C22C38/28C22C38/26C22C38/24C21D8/0226C21D8/0236C21D8/0273C21D1/18C21D2211/005C21D2211/008C21D2211/002C21D2211/001
Inventor 胡智评刘仁东顾兴利郭金宇蒋睿婷林春青
Owner ANGANG STEEL CO LTD