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980MPa-grade cold-rolled dual-phase steel with yield strength exceeding 700MPa and production method thereof

A technology of yield strength and production method, which is applied in the field of iron and steel smelting, can solve the problems of low yield strength and achieve the effects of avoiding plasticity reduction, improving strong plasticity, and enhancing stability

Inactive Publication Date: 2021-04-02
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The technical problem to be solved by the present invention is the problem of low yield strength in the existing 980MPa grade cold-rolled dual-phase steel

Method used

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  • 980MPa-grade cold-rolled dual-phase steel with yield strength exceeding 700MPa and production method thereof
  • 980MPa-grade cold-rolled dual-phase steel with yield strength exceeding 700MPa and production method thereof
  • 980MPa-grade cold-rolled dual-phase steel with yield strength exceeding 700MPa and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0041] This example provides two groups of 980 MPa grade cold-rolled dual-phase steels with a yield strength exceeding 700 MPa as Example 1 and Example 2, the chemical composition of which is shown in Table 1.

[0042] Table 1 Chemical composition of cold-rolled dual-phase steel (wt.%)

[0043]

[0044]

[0045] The production method of the above-mentioned 980MPa-grade cold-rolled dual-phase steel with a yield strength exceeding 700MPa, the specific process is as follows:

[0046] a. Smelting process: through the smelting process, a dual-phase steel slab with the chemical composition shown in Table 1 is prepared, wherein the V content of the original molten iron is controlled in the converter, instead of additionally adding ferro-vanadium;

[0047] b. Hot rolling process: the slab is heated, dephosphorized, hot rolled and laminar cooled to obtain a hot rolled coil. The specific hot rolling process parameters are shown in Table 2.

[0048] Table 2 Main process parameters...

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Abstract

The invention discloses 980MPa-grade cold-rolled dual-phase steel with the yield strength exceeding 700MPa and a production method thereof, and belongs to the technical field of steel smelting. The 980MPa-grade cold-rolled dual-phase steel with the yield strength exceeding 700MPa comprises the following chemical components in percentage by mass: 0.07-0.12% of C, 0.20-0.60% of Si, 1.50-2.20% of Mn,less than or equal to 0.015% of P, less than or equal to 0.005% of S, 0.015-0.070% of Als, less than or equal to 0.0045% of N, 0.02-0.50% of Mo, 0.010-0.040% of Nb, 0.010-0.040% of Ti, 0.40-0.70% ofCr and the balance of Fe and unavoidable impurities. The production method comprises the processes of smelting, hot rolling, acid rolling, continuous annealing and the like. According to the 980MPa-grade cold-rolled dual-phase steel with the yield strength exceeding 700MPa provided by the invention, the steel has excellent mechanical properties, the yield strength is 710-770MPa, the tensile strength is 995-1080MPa, the elongation A80 is 9.0-13.0%, and the problem of low yield strength in the existing 980MPa-grade cold-rolled dual-phase steel can be effectively solved.

Description

technical field [0001] The invention belongs to the technical field of iron and steel smelting, and in particular relates to a 980MPa grade cold-rolled dual-phase steel with a yield strength exceeding 700MPa and a production method thereof. Background technique [0002] In recent years, with the rapid development of science and technology, in order to reduce energy consumption and exhaust emissions during the use of automobiles, in order to reduce the weight of the car body and improve its safety performance, it has become an inevitable development of steel for automobiles in the direction of high strength and high toughness. trend. Dual-phase steel has the characteristics of low yield ratio, high tensile strength and excellent plasticity, and has become the first choice for high-strength steel for automobiles. Its consumption is expected to exceed 80% of advanced high-strength steel for automobiles, and it has a good application prospect. [0003] At present, the mainstrea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/38C22C38/06C22C38/22C22C38/26C22C38/28C21D8/02
CPCC22C38/02C22C38/38C22C38/06C22C38/22C22C38/26C22C38/28C21D8/0226C21D8/0236C21D8/0247C21D2211/008C21D2211/005
Inventor 余灿生郑之旺郑昊青王敏莉
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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