780MPa-grade hot-dip galvanized dual-phase steel with enhanced formability and manufacturing method thereof

A manufacturing method, dual-phase steel technology, applied in hot-dip plating process, coating, metal material coating process, etc., can solve problems such as difficult forming, improve surface quality, improve formability, and inhibit austenite decomposition and the effect of carbide formation

Active Publication Date: 2020-11-06
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the technical problem of poor formability of existing high-strength steels, the invention provides a 780MPa-level enhanced formability hot-dip galvanized dual-phase steel. Compared with the traditional du

Method used

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  • 780MPa-grade hot-dip galvanized dual-phase steel with enhanced formability and manufacturing method thereof
  • 780MPa-grade hot-dip galvanized dual-phase steel with enhanced formability and manufacturing method thereof
  • 780MPa-grade hot-dip galvanized dual-phase steel with enhanced formability and manufacturing method thereof

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Embodiment

[0108] The present invention is a 780MPa-level enhanced formability hot-dip galvanized dual-phase steel, the chemical composition of the dual-phase steel includes in mass fraction:

[0109] C: 0.16%~0.2%, Si: 0.35%~0.65%, Mn: 1.8%~2.3%, Al: 0.7%~1.0%, P≤0.01%, S≤0.003%, Si+Al≥1.2%, the rest Fe and unavoidable impurities;

[0110] Further, the chemical composition of the dual-phase steel also includes any one of the following elements in terms of mass fraction:

[0111] Cr: 0.16% to 0.25%, Mo: 0 to 0.3%.

[0112] The chemical composition of each embodiment of the present invention and comparative example is as shown in table 1:

[0113] The chemical composition (wt.%) of each embodiment of table 1 and comparative example

[0114]

[0115]

[0116] A method for manufacturing a 780MPa-level enhanced formability hot-dip galvanized dual-phase steel of the present invention has the following steps:

[0117] (1): According to the chemical composition ratio of 780MPa enhance...

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Abstract

The invention provides 780MPa-grade hot-dip galvanized dual-phase steel with enhanced formability, and belongs to the field of manufacturing of high-strength steel for automobiles. The 780MPa-grade hot-dip galvanized dual-phase steel with enhanced formability comprises the following chemical components of, in percentage by mass, 0.16%-0.2% of C, 0.35%-0.65% of Si, 1.8%-2.3% of Mn, 0.7%-1.0% of Al,P is less than or equal to 0.01%, S is less than or equal to 0.003%, and the balance Fe and inevitable impurities. Compared with traditional dual-phase steel of the same grade, the dual-phase steel has better forming performance, and the problem that traditional dual-phase steel is difficult to form on a complex stamping structural part is solved. The invention further provides a manufacturing method of the 780 MPa-grade hot-dip galvanized dual-phase steel with the enhanced formability.

Description

technical field [0001] The invention belongs to the field of manufacturing high-strength steel for automobiles, and relates to a 780MPa-level reinforced formability hot-dip galvanized dual-phase steel and a manufacturing method thereof. Background technique [0002] From the perspective of energy saving, emission reduction and environmental protection, the lightweight of automobile body is a major trend. At the same time, in order to protect the safety of drivers and passengers, it is also necessary to improve the collision safety of body materials. In view of the above requirements, the application of advanced high-strength steels in automobile bodies is gradually expanding. [0003] However, the increase in the strength of steel plates usually leads to a decrease in formability, making it impossible for some auto parts with complex shapes to be stamped and formed from high-strength steel plates. Even for dual-phase steels with excellent strength, plasticity and work hard...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/12C22C38/38C22C38/22C21D8/02C23C2/06C23C2/40
CPCC22C38/02C22C38/04C22C38/06C22C38/12C22C38/38C22C38/22C21D8/0226C21D8/0236C21D8/0273C23C2/06C23C2/40C21D2211/005C21D2211/002C21D2211/008C21D2211/001
Inventor 韩赟朱国森谢春乾刘华赛邱木生邹英阳锋姜英花滕华湘李飞章军
Owner SHOUGANG CORPORATION
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