Method for producing hot-dip galvanized trip780 steel with different yield strength grades
A yield strength, hot-dip galvanizing technology, applied in hot-dip galvanizing process, coating, metal material coating process, etc., can solve problems that have not been well solved
Active Publication Date: 2021-03-23
SD STEEL RIZHAO CO LTD
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Problems solved by technology
[0004]
Judging from the current published related patents, the above technical problems have not been well resolved
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[0037] The following are specific examples of the present invention, further describing the technical solutions of the present invention, but the protection scope of the present invention is not limited to these examples. All changes or equivalent substitutions that do not depart from the concept of the present invention are included in the protection scope of the present invention.
[0038] The chemical composition of steel slabs in Examples 1 to 3 of the present invention includes C: 0.17 to 0.20%, Si: 0.16 to 0.22%, Mn: 1.65 to 1.95%, Alt: 1.20 to 1.50%, and Nb: 0.10 to 0.20% by weight. %, Mo: 0.10~0.15%, and limit P≤0.010%, S≤0.005%, N≤0.005%, O≤0.005%, and the balance is Fe and other unavoidable impurities. The chemical composition of the tapping molten steel of the billet in specific embodiments 1-3 is shown in Table 1, and the thickness of the billet is 230mm.
[0039] The actual smelting composition (mass percentage, %) of table 1 embodiment 1-3
[0040]
[0041] ...
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Abstract
The invention relates to a method for producing hot galvanized TRIP780 steel of different yield strength grades. A steel blank with the thickness being 230 mm is subjected to the procedure of plate blank heating, the procedure of hot rolling, the procedure of acid rolling, the procedure of hot galvanizing and the procedure of finishing, and hot galvanized TRIP780 steel products of three yield strength grades being 410-450 MPa, 460-500 MPa and 510-560 MPa are prepared. The product with the yield strength grade being 410-450 MPa is suitable for automobile structure parts and reinforcement partswith high deep processing forming and geometric accuracy requirements. The product with the yield strength grade being 460-500 MPa is suitable for automobile structure parts and reinforcement parts with high cold processing forming requirements. The product with the yield strength grade being 510-560 MPa is suitable for automobile structure parts and reinforcement parts required to efficiently absorb impact energy characteristics with low deformation during colliding.
Description
technical field [0001] The invention belongs to the technical field of hot-dip galvanized high-strength steel for automobiles, and in particular relates to a method for producing hot-dip galvanized TRIP780 steel with different yield strength levels. Background technique [0002] Hyundai Motor's manufacturing concept puts forward different requirements for multi-performance, multi-parts, and multi-specifications such as corrosion resistance, excellent ductility, easy processing and formability, high strength and geometric accuracy for 780MPa high-strength steel. Due to its special structure ratio, hot-dip galvanized TRIP780 steel (TRIP780+Z) products not only meet the above characteristics, but also have a good weight reduction effect, which just follows the trend of automobile lightweight, so it continues to receive great attention from the automobile industry and steel companies . [0003] However, the characteristics of TRIP780+Z steel products for automobiles, such as mu...
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IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/12C21D8/02C23C2/06C23C2/40
CPCC21D8/0226C21D8/0236C21D2211/001C21D2211/002C21D2211/005C21D2211/008C22C38/02C22C38/04C22C38/06C22C38/12C23C2/06C23C2/40
Inventor 侯晓英郝亮金光宇王业勤康华伟尹翠兰王鹏丁紫正曹光明何召东
Owner SD STEEL RIZHAO CO LTD