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Preparation method of alloyed hot-galvanized dual-phase steel

A dual-phase steel and alloying technology, applied in hot-dip plating process, metal material coating process, coating, etc., can solve the problems of poor hole expansion of dual-phase steel

Active Publication Date: 2015-05-06
SHOUGANG CORPORATION
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Problems solved by technology

[0005] Aiming at the problems existing in the prior art, the embodiment of the present invention provides a method for preparing an alloyed hot-dip galvanized dual-phase steel, which is used to solve the technical problem of poor hole expandability of the dual-phase steel in the prior art

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  • Preparation method of alloyed hot-galvanized dual-phase steel
  • Preparation method of alloyed hot-galvanized dual-phase steel

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Embodiment 2

[0066] In order to verify the preparation method of the dual-phase steel provided by the present invention, the experiment was carried out at different coiling temperature, second heating temperature and galvanizing alloying temperature in this embodiment.

[0067] Specifically, the chemical composition table of the molten steel is shown in Table 1:

[0068] Table 1

[0069] C

[0070] As shown in Table 1, the weight percentage of C is 0.09%; the weight percentage of Si is 0.2%; the weight percentage of Mn is 1.5%; the weight percentage of Als is 0.036%; the weight percentage of P The percentage is 0.002%; the weight percentage of S is 0.002%; the weight percentage of Cr is 0.2%; the weight percentage of Mo is 0.22%; the weight percentage of Nb is 0.03%.

[0071] Test the molten steel under four different test conditions to test the hole expansion rate and yield strength of dual-phase steel;

[0072] The first test includes: setting the coiling temperature to 690°C, the second heati...

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Abstract

The invention provides a preparation method of alloyed hot-galvanized dual-phase steel, belonging to the technical field of high-strength cold-rolled hot-galvanized steel. Cold-rolled dual-phase DP steel comprises the following chemical components in percentage by weight: 1.3%-1.7% of Mn, less than or equal to 0.01% of P, 0.15%-0.25% of Mo, 0.15%-0.25% of Cr, 0.02%-0.04% of Nb, 0.07%-0.11% of C, 0.2%-0.5% of Si, 0.02%-0.07% of Als, less than or equal to 0.04% of N, 0.01% of S and the balance of Fe and impurities. According to the preparation method of the alloyed hot-galvanized dual-phase steel with excellent pore broadening performance, by adding a certain amount of Nb, martensite phases are refined and uniformly dispersed in a final microstructure; furthermore, by properly regulating the alloying temperature (520-560 DEG C), a proper amount of intermediate hard phase pearlite is generated, and the hardness difference between the hard martensite phases and a soft ferritic phase is reduced, so that the pore broadening performance of the dual-phase steel is improved.

Description

Technical field [0001] The invention relates to the technical field of high-strength cold-rolled hot-dip galvanized steel, in particular to an alloyed hot-dip galvanized dual-phase steel and a preparation method thereof. Background technique [0002] The microstructure of Dual Phase Steel (DP) consists of two phases, polygonal ferrite and martensite. Ferrite provides the ductility of the steel, and martensite provides the strength. The dual-phase steel has the characteristics of low yield ratio, high initial work hardening rate, and good strength and ductility matching, and has become one of the preferred materials for high-strength steel for automobiles. However, the soft matrix ferrite phase and the hard martensite phase of dual-phase steel easily form vacancies at the boundary, so there is a problem of poor hole expandability. [0003] Different from the continuous annealing process, in the alloyed galvanizing process, the galvanizing temperature and alloying temperature hinder...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/38C22C38/26C22C33/04C21D8/02C23C2/06C23C2/40
Inventor 姜英花邝霜刘华赛韩赟滕华湘刘光明崔阳李飞朱国森
Owner SHOUGANG CORPORATION
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