590MPa or above grade reinforced formability hot-dip galvanized dual-phase steel and preparation method thereof

A dual-phase steel and hot-dip galvanizing technology, which is applied to heat treatment equipment, furnace types, heat treatment furnaces, etc., can solve problems such as excess elongation, difficult forming, and large welding problems, so as to improve forming performance, meet forming requirements, and be good Effect of elongation and work hardening properties

Inactive Publication Date: 2021-03-19
SD STEEL RIZHAO CO LTD
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Problems solved by technology

However, at present, mainstream European automobile companies realize that traditional DP steel is difficult to form on many high-drawability parts, and it is difficult to meet the complex stamping structural parts of automobile design. However, the use of TRIP steel will lead to higher alloy content and greater welding problems. And the elongation rate is surplus, resulting in waste

Method used

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  • 590MPa or above grade reinforced formability hot-dip galvanized dual-phase steel and preparation method thereof
  • 590MPa or above grade reinforced formability hot-dip galvanized dual-phase steel and preparation method thereof
  • 590MPa or above grade reinforced formability hot-dip galvanized dual-phase steel and preparation method thereof

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Embodiment Construction

[0023] The invention solves the technical problem of how to improve the formability on the basis of meeting the strength requirement and not increasing the cost of the alloy by providing a hot-dip galvanized dual-phase steel with enhanced formability at a level above 590MPa.

[0024] The technical solution in the embodiment of the present invention is to solve the above-mentioned technical problems. The TRIP effect produced by austenite can improve the elongation of hot-dip galvanized dual-phase steel. The specific element ratio and its main functions are detailed in the following description.

[0025] C: 0.14%~0.16%, Si: 0.10%~0.15%, Mn: 1.6%~1.8%, P: ≤0.015%, S: ≤0.007%, Al: 0.6%~0.8%, Nb: 0.008%~0.015 %, N: ≤0.005%, the rest is Fe and unavoidable impurities.

[0026] The C element plays a role in stabilizing the austenite. Reasonable control of the proportion of the C content in the cooling process can obtain a certain amount of stable retained austenite and ensure the pro...

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Abstract

The invention discloses 590MPa or above grade reinforced formability hot-dip galvanized dual-phase steel and a preparation method thereof. The 590MPa or above grade reinforced formability hot-dip galvanized dual-phase steel comprises the following chemical components in percentage by weight: 0.14-0.16% of C, 0.10-0.15% of Si, 1.6-1.8% of Mn, less than or equal to 0.015% of P, less than or equal to0.007% of S, 0.6-0.8% of Al, 0.008-0.015% of Nb, less than or equal to 0.005% of N and the balance Fe and inevitable impurities. The 590MPa or above grade reinforced formability hot-dip galvanized dual-phase steel has better elongation and work hardening characteristics.

Description

technical field [0001] The invention relates to the technical field of steel rolling, in particular to a hot-dip galvanized dual-phase steel with enhanced formability at a level above 590 MPa and a preparation method thereof. Background technique [0002] In order to achieve lightweight, energy-saving and emission-reducing vehicles, and to improve vehicle safety, the application of advanced high-strength steel in body-in-white is increasing day by day. Among them, dual-phase steel has become the most widely used steel type in advanced high-strength steel due to its good comprehensive mechanical properties. However, at present, mainstream European automobile companies realize that traditional DP steel is difficult to form on many high-drawability parts, and it is difficult to meet the complex stamping structural parts of automobile design. However, the use of TRIP steel will lead to higher alloy content and greater welding problems. And the elongation rate is excessive, resul...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/12C21D1/26C21D6/00C21D8/02C21D9/52
CPCC21D1/26C21D6/005C21D6/008C21D8/0221C21D9/52C21D2211/001C21D2211/005C21D2211/008C22C38/001C22C38/002C22C38/02C22C38/04C22C38/06C22C38/12
Inventor 胡华东徐国军刘培星任东侯晓英田祥省田川雷凯查凯董立华
Owner SD STEEL RIZHAO CO LTD
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