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Alloyed hot-dipped galvanized steel sheet

A hot-dip galvanized steel sheet, hot-dip galvanized technology, applied in the direction of hot-dip galvanizing process, heat treatment furnace, heat treatment equipment, etc., can solve the problems that have not been fully studied, and achieve excellent ultimate deformation ability and press formability excellent effect

Active Publication Date: 2021-04-30
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in Patent Document 3, no sufficient studies have been conducted from the viewpoint of improving the ultimate deformability after sinter hardening.

Method used

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  • Alloyed hot-dipped galvanized steel sheet
  • Alloyed hot-dipped galvanized steel sheet
  • Alloyed hot-dipped galvanized steel sheet

Examples

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Embodiment

[0154] Next, examples of the present invention will be described. The conditions in the examples are an example of conditions adopted for confirming the practicability and effects of the present invention, and the present invention is not limited to this example of conditions. Various conditions can be employed in the present invention as long as the object of the present invention is achieved without departing from the gist of the present invention.

[0155] A slab having the chemical composition shown in Table 1 was manufactured, and after heating the slab at 1300° C. for 1 hour, rough rolling and finish rolling were carried out under the conditions shown in Table 2, and then the steel sheet was coiled, and shown in Table 2. The coiling temperature shown in was maintained for 1 hour to obtain a hot-rolled steel sheet. Thereafter, the hot-rolled steel sheets were pickled, and cold-rolled at the rolling reductions shown in Table 2 to obtain cold-rolled steel sheets with a thi...

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Abstract

An alloyed hot-dipped galvanized steel sheet according to one embodiment of the present invention has an alloyed hot-dip galvanization layer on at least one surface of a steel sheet; the steel sheet has a predetermined chemical component; the steel sheet contains ferrite in an area ratio of from 10% to 90% (inclusive), while containing tempered martensite and tempered bainite in an area ratio of 10% or more, with the total of the ferrite, the tempered martensite and the tempered bainite being 90% or more; each ferrite grain contains carbides that have a length of from 50 nm to 300 nm (inclusive) at a number density of 20 carbides / [mu]m<2> or more; and the two-dimensional homogeneity variance ratio S of Mn is from 0.75 to 1.30 (inclusive).

Description

technical field [0001] The present invention relates to an alloyed hot-dip galvanized steel sheet, and more specifically, to an alloyed hot-dip galvanized steel sheet with excellent coating and sinter hardening performance suitable for structural members such as automobiles which are mainly used through press working. [0002] This application claims priority based on Japanese Patent Application No. 2018-189222 for which it applied in Japan on October 4, 2018, and uses the content here. Background technique [0003] Steel sheets used in automobiles are increasing in strength year by year. This is because, while gradually reducing the weight of the vehicle body, the crash characteristics that deteriorate due to the weight reduction of the vehicle body are improved. Since automotive parts are mostly produced by press molding, excellent formability is required in addition to high strength. Therefore, there is a demand for a material that is relatively soft during molding, is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00C22C38/06C22C38/58C21D9/46C22C18/04
CPCC22C18/04C21D9/46C22C38/06C23C30/00C23C2/02C23C2/06C23C2/28C23C2/40C21D1/19C21D8/021C21D8/0226C21D8/0263C21D8/0236C21D8/0273C21D1/26C21D1/25C21D1/185C21D2211/003C21D2211/005C21D2211/008C21D2211/002C21D2211/004C22C38/02C22C38/04C22C38/001C22C38/14C22C38/12C22C38/16C22C38/08C22C38/002C22C38/005B32B15/013C23C2/024C23C2/022C23C2/29C23C2/0224C22C38/58C22C38/50C22C38/48C22C38/46C22C38/42C22C38/44C22C38/54
Inventor 永野真衣林宏太郎上西朗弘
Owner NIPPON STEEL CORP
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