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780mpa grade cold-rolled hot-dip galvanized dual-phase steel with high formability and manufacturing method thereof

A manufacturing method, hot-dip galvanizing technology, applied in hot-dip galvanizing process, coating, metal material coating process, etc., can solve problems such as poor manufacturability and increased alloy cost, and achieve improved formability and improved processing Hardenability, effect of alloy cost reduction

Active Publication Date: 2022-03-18
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the high-strength cold-rolled hot-dip galvanized dual-phase steel involved in the patent has a high content of Al and Cr, which makes the manufacturability of the steel worse and the cost of the alloy increases.

Method used

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  • 780mpa grade cold-rolled hot-dip galvanized dual-phase steel with high formability and manufacturing method thereof
  • 780mpa grade cold-rolled hot-dip galvanized dual-phase steel with high formability and manufacturing method thereof
  • 780mpa grade cold-rolled hot-dip galvanized dual-phase steel with high formability and manufacturing method thereof

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Embodiment Construction

[0052] Below in conjunction with embodiment and accompanying drawing, the present invention will be further described, and the embodiment of the present invention is implemented on the premise of the technical solution of the present invention, has provided detailed implementation mode and specific operation process, but protection scope of the present invention is not limited to following Example.

[0053] Table 1 is the composition of the examples of the present invention, Table 2 is the manufacturing process parameters of the examples of the present invention, and Table 3 is the mechanical properties of the examples of the present invention.

[0054] The steel materials with the composition shown in Table 1 are smelted and cast to make cast slabs; after holding at a reheating temperature of 1200-1260°C for not less than 1 hour, hot rolling and finish rolling are completed at a final rolling temperature above 850°C. The thickness of the rolled plate is about 3.6 mm; the hot-...

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Abstract

The invention discloses a 780MPa grade cold-rolled hot-dip galvanized dual-phase steel with high formability and a manufacturing method thereof. The mass percentages of its chemical components are: C 0.1-0.2%, Mn 1.3-2.5%, Si 0.4-1.0 %, P≤0.02%, S≤0.01%, N≤0.008%, and the balance is Fe and unavoidable impurities. In the present invention, after conventional smelting, hot rolling, and cold-acid continuous rolling, hot-dip galvanizing and recrystallization annealing are carried out through the QP process, and the final structure of the galvanized sheet is mainly ferrite, tempered martensite and retained austenite; Its tensile strength is ≥ 780MPa, elongation ≥ 18%, n10-20% ≥ 0.14, hole expansion rate λ ≥ 25%. By controlling the cooling rate, the present invention reduces the use of alloy elements, thereby reducing the cost of the alloy and improving the formability of the hot-dip galvanized dual-phase steel.

Description

technical field [0001] The invention belongs to the technical field of hot-dip galvanized steel sheets, and in particular relates to a 780MPa grade cold-rolled hot-dip galvanized dual-phase steel with relatively high formability and a manufacturing method thereof. Background technique [0002] Since the development of the automobile industry, dual-phase steel is still the most advanced high-strength steel used in body-in-white. Among them, hot-dip galvanized dual-phase steel is mostly used for body structural parts and reinforcements because of its excellent corrosion resistance. However, in the process of use, it is increasingly difficult for dual-phase steel to meet the stamping needs of complex parts. [0003] Patent documents such as Chinese Patent Publication No. CN105603306A, CN106119716A, US Patent US8882938B2 and WO2017 / 001303A1 disclose hot-dip galvanized DP steel with high elongation characteristics. The above patents all use C, Mn, Si, Al, and Cr as the main allo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/04C22C38/02C22C38/14C22C38/12C22C38/06C22C38/18C22C38/38C22C38/28C22C38/26C22C38/24C22C38/22C21D8/02C23C2/06C23C2/40
CPCC22C38/04C22C38/02C22C38/14C22C38/12C22C38/06C22C38/18C22C38/38C22C38/28C22C38/26C22C38/24C22C38/22C21D8/0226C21D8/0236C21D8/0273C23C2/06C23C2/40C21D2211/005C21D2211/008C21D2211/002C21D2211/001C21D2211/004
Inventor 王俊峰何承先茅玮辰张红王利
Owner BAOSHAN IRON & STEEL CO LTD
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