High-strength and high-plasticity medium-manganese Q and P steel cold-rolling annealing plate and preparing technology thereof

A technology of cold rolling annealing and high plasticity, which is applied in the field of automobile sheets and home appliance sheets, can solve the problems that the strength and performance cannot be significantly improved, and the residual austenite structure is not much, so as to increase the content of retained austenite and take into account The effect of production costs

Active Publication Date: 2016-06-08
HBIS COMPANY LIMITED HANDAN BRANCH COMPANY
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Problems solved by technology

Subsequently, the Q&P process was widely applied in the field of low manganese TRIP steel, and a low manganese TRIP steel using the Q&P process was developed. However, due to the limitation of the composition...

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  • High-strength and high-plasticity medium-manganese Q and P steel cold-rolling annealing plate and preparing technology thereof
  • High-strength and high-plasticity medium-manganese Q and P steel cold-rolling annealing plate and preparing technology thereof
  • High-strength and high-plasticity medium-manganese Q and P steel cold-rolling annealing plate and preparing technology thereof

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Embodiment Construction

[0021] A cold-rolled annealed sheet of high-strength and high-plasticity medium manganese Q&P steel of the present invention, its chemical composition and weight percentage are respectively: C0.1~0.3%, Si0.8~2.0%, Mn4.0~8.0%, P≤0.01%, S≤0.01%, N≤0.01%; where C is preferably 0.12~0.22%, Si is preferably 1.2~1.8%, Mn is preferably 5.0~7.0%, and Nb with a weight percentage of ≤0.06% can also be added to the components Or V or Ti, the rest is iron and unavoidable impurities.

[0022] The preparation method of the high-strength and high-plasticity medium manganese Q&P steel cold-rolled annealed plate of the present invention includes smelting, casting, hot rolling, cold rolling and heat treatment processes, and the chemical composition and weight percentage of the annealed plate are: C0.1~0.3 %, Si0.8~2.0%, Mn4.0~8.0%, P≤0.01%, S≤0.01%, N≤0.01%, the rest is iron and unavoidable impurities; the hot rolling process requires the billet to be heated to 1150~1250 After heat preservatio...

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Abstract

The invention discloses a high-strength and high-plasticity medium-manganese Q and P steel cold-rolling annealing plate and a preparing technology thereof. The annealing plate comprises chemical components including, by weight percent, 0.1%-0.3% of C, 0.8%-2.0% of Si, 4.0%-8.0% of Mn, smaller than or equal to 0.01% of P, smaller than or equal to 0.01% of S, smaller than or equal to 0.01% of N, and the balance iron and inevitable impurities. The preparing technology includes smelting, hot rolling, intermediate annealing, cold rolling and final heat treatment. The Q and P technology is applied to the field of medium-manganese steel field, a two-phase region Q and P technology is developed, and finally complex-phase medium-manganese Q and P steel including martensite, retained austenite and a ferritic structure is obtained, wherein the tensile strength ranges from 900 MPa to 1,300 MPa, plasticity ranges from 24% to 37%, and the product of strength and elongation reaches 30 GPa% to 45 GPa%. The continuous annealing treatment of the medium-manganese steel is achieved, the time of traditional cover annealing is shortened, and meanwhile the high-strength medium-manganese steel plate with strength and plasticity well matched is obtained.

Description

technical field [0001] The invention relates to an automobile plate and a home appliance plate, in particular to a high-strength and high-plasticity medium manganese Q&P steel cold-rolled annealed plate and a preparation process thereof. Background technique [0002] Advanced high-strength steel (AHSS) can maximize the safety of the car while reducing its own weight, so it has become the focus of the major automotive industries. Since the introduction of advanced high-strength steel, it has developed rapidly. The first-generation high-strength steel represented by IF steel, DP steel and TRIP steel, the second-generation high-strength steel represented by TWIP steel and the recently proposed high-strength high-strength steel have been developed. The third-generation high-strength steel represented by Q&P steel. The first generation of high-strength steel improves the strength of steel, but its plasticity is low; although the strength and plasticity of the second-generation h...

Claims

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Application Information

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IPC IPC(8): C22C38/04C22C38/02C21D8/02
CPCC21D8/0247C21D2211/001C21D2211/005C21D2211/008C22C38/001C22C38/02C22C38/04
Inventor 许斌唐恒国李守华何方程迪贾贵兴张龙柱
Owner HBIS COMPANY LIMITED HANDAN BRANCH COMPANY
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