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Cold-rolled dual-phase steel with tensile strength being 780MPa and high hole reaming performance and preparation method thereof

A tensile strength, dual-phase steel technology, applied in the field of steel plate production, can solve problems such as poor hole expansion performance, achieve excellent welding performance, achieve lightweight, and reduce production costs.

Inactive Publication Date: 2020-05-29
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

[0007] The technical problem to be solved by the present invention is: the existing cold-rolled dual-phase steel with a tensile strength of 780 MPa has poor hole expansion performance

Method used

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  • Cold-rolled dual-phase steel with tensile strength being 780MPa and high hole reaming performance and preparation method thereof
  • Cold-rolled dual-phase steel with tensile strength being 780MPa and high hole reaming performance and preparation method thereof

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Embodiment 1

[0028] The present invention has a tensile strength of 780MPa and a method for preparing cold-rolled dual-phase steel with high hole-expanding performance. The specific process is as follows:

[0029] A, smelting process: through the smelting process, a dual-phase steel slab with the chemical composition shown in Table 1 is prepared, wherein the original molten iron V content is controlled in the converter, instead of adding additional ferro-vanadium alloy;

[0030] Table 1 Example 1 Cold-rolled dual-phase steel chemical composition (wt.%)

[0031] Numbering C Si mn P S N als V 1 0.090 0.50 2.05 0.010 0.002 0.0030 0.045 0.050 2 0.085 0.55 2.10 0.008 0.004 0.0035 0.036 0.052

[0032] B, hot-rolling process: the hot-rolled coil is obtained after the slab is heated, dephosphorized, hot-rolled and laminar cooling, and the specific hot-rolling process parameters are as shown in Table 2;

[0033] Table 2 Example 1 Cold-rolled dual-phas...

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Abstract

The invention discloses cold-rolled dual-phase steel with the tensile strength being 780MPa and high hole reaming performance and a preparation method thereof and belongs to the technical field of steel plate production. A steel plate comprises the following chemical components in percentage by weight: 0.08-0.10% of C, 0.50-0.60% of Si, 2.00-2.20% of Mn, 0.040-0.060% of V, 0.03-0.05% of Al, equalto or less than 0.010% of P, equal to or less than 0.002% of S, equal to or less than 0.003% of N and the balance of Fe and unavoidable impurities. Through controlling C content and reasonable alloy matching, the hardness difference of ferrite-martensite is reduced as much as possible to improve the hole reaming performance on the premise of ensuring the strength.

Description

technical field [0001] The invention belongs to the technical field of steel plate production, and in particular relates to a cold-rolled dual-phase steel with a tensile strength of 780 MPa and high hole-expanding performance and a preparation method thereof. Background technique [0002] With the rapid development of science and technology, in order to reduce the weight of the car body and improve its safety performance, the development of high-strength steel for automobiles has become an inevitable trend. The use of high-strength steel plates to replace traditional materials can significantly improve energy absorption capacity, expand the elastic strain zone, increase the deformation resistance of components, and improve the anti-sag performance while maintaining high formability, creating conditions for realizing lightweight vehicles. Dual-phase steel is the most widely used high-strength steel. Its structure is mainly composed of soft ferrite matrix and high-strength mar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/12C21D8/02
CPCC21D8/0226C21D8/0236C21D8/0247C21D2211/005C21D2211/008C22C38/02C22C38/04C22C38/06C22C38/12
Inventor 余灿生郑之旺张功庭郑昊青
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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