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High-ductility, high-strength electro-galvanized steel sheet and manufacturing method thereof

A manufacturing method and electro-galvanizing technology, applied in the direction of manufacturing tools, circuits, magnetic objects, etc., can solve the problems of not easy to release, reduced local ductility, implied ductility, etc., to suppress decarburization, excellent bendability, and reduce diffusivity Effect of Hydrogen Amount

Active Publication Date: 2021-05-28
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Hydrogen embrittlement may occur with the increase in the strength of steel sheets. In recent years, the intrusion of hydrogen in the steel sheet manufacturing process is difficult to be released by plating, suggesting the danger of reduced ductility, especially local ductility.

Method used

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  • High-ductility, high-strength electro-galvanized steel sheet and manufacturing method thereof
  • High-ductility, high-strength electro-galvanized steel sheet and manufacturing method thereof
  • High-ductility, high-strength electro-galvanized steel sheet and manufacturing method thereof

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Embodiment

[0116] The present invention will be specifically described with reference to examples.

[0117] 1. Manufacture of steel plates for evaluation

[0118]The steel having the composition shown in Table 1 and the remainder consisting of Fe and unavoidable impurities was smelted in a vacuum melting furnace, followed by billet rolling to obtain a billet-rolled material with a thickness of 27 mm. The obtained billet-rolled material was hot-rolled to a plate thickness of 4.0 mm to produce a hot-rolled steel sheet (hot-rolling process). Next, for the cold-rolled sample, the hot-rolled steel sheet was ground to a thickness of 3.2 mm, and then cold-rolled at the reduction ratio shown in Table 2-1 to Table 2-4 to a thickness of 1.4 mm. , Manufacture cold rolled steel sheet (cold rolling process). In addition, in Table 2-1, when the numerical value of the reduction rate of cold rolling is not described, it means that cold rolling was not performed. Next, the hot-rolled steel sheets and ...

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Abstract

This high-ductility, high-strength electro-galvanized steel sheet with excellent bendability and a 0.20 ppm by mass or lower diffusible hydrogen content in the steel, is formed having electro-zinc plating on a surface of steel sheet stock which has a prescribed component composition and has a steel structure in which, in the entire steel structure, the surface area ratio of martensite having carbides with an average particle size of 50 nm or less and / or bainite having carbides with an average particle size of 50 nm or less is 90% or higher in total, and, in the region from the surface of the stock steel sheet to 1 / 8th thickness of the sheet thickness, the surface area ratio of the martensite having carbides with an average particle size of 50 nm or less and / or bainite having carbides with an average particle size of 50 nm or less is 80% or higher in total, and wherein the total of the outer perimeters of the carbides with an average particle size of 50 nm or less included in the martensite having carbides with an average particle size of 50 nm or less and bainite having carbides with an average particle size of 50 nm or less is greater than or equal to 50um / mm2. A manufacturing method of said sheet is also provided.

Description

technical field [0001] The invention relates to a high ductility and high strength electrogalvanized steel sheet and a manufacturing method thereof. More specifically, the present invention relates to a high-ductility, high-strength galvanized steel sheet used for automobile parts and a method for producing the same, and particularly to a high-ductility, high-strength galvanized steel sheet excellent in bendability and a method for producing the same. Background technique [0002] In recent years, the tendency to reduce the weight of the vehicle body itself has become more and more active, and the thickness of the steel plate used for the vehicle body has been reduced by increasing the strength. In particular, the application of high-strength steel plates with a TS (tensile strength) of 1320 to 1470 MPa for body frame parts such as center pillar R / F (reinforcement), bumpers, and crash beam parts (hereinafter also referred to as parts) gradually developed. In addition, from...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00C21D9/46C22C38/60C25D5/26C25D5/50
CPCC21D9/46C25D5/50C22C38/60C25D3/22C21D1/19C21D1/22C21D8/0226C21D8/0263C21D8/0273C21D8/0473C21D8/0463C21D8/0426C21D9/48C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14C22C38/16C22C38/32C22C38/34C22C38/38C21D2211/002C21D2211/004C21D2211/008C21D6/005C21D6/008C21D6/02C25D5/36C25D3/565C22C38/001C22C38/08C22C38/44C22C38/46C22C38/50C21D8/1222B21C47/02C21D8/1272C21D8/1233C23C2/06H01F1/147C21D8/0205C21D8/0236
Inventor 平岛拓弥金子真次郎
Owner JFE STEEL CORP
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