Title:
ZINC-PLATED STEEL SHEET
Document Type and Number:
WIPO Patent Application WO/2023/095870
Kind Code:
A1
Abstract:
This zinc-plated steel sheet comprises a steel sheet and a zinc plating layer arranged on the steel sheet, in which a metal structure at a depth corresponding to 1/4 of the thickness of the steel sheet from the surface of the steel sheet comprises, in % by area, 2.0 to 25.0% of ferrite, 10.0% or less of bainite, more than 60.0% and 93.0% or less of tempered martensite and 5.0% or more of retained austenite, and the area ratio of the retained austenite that contacts with a 30° grain boundary, has an Mn concentration that is 1.2 times larger than the average Mn concentration, and also has a crystal grain diameter of 0.3 to 2.0μm is 3.0% or more.
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Inventors:
YABU SHOHEI (JP)
Application Number:
PCT/JP2022/043522
Publication Date:
June 01, 2023
Filing Date:
November 25, 2022
Export Citation:
Assignee:
NIPPON STEEL CORP (JP)
International Classes:
C22C38/00; C22C38/58; C21D8/02; C21D9/46
Domestic Patent References:
| WO2019187124A1 | 2019-10-03 | |||
| WO2013051160A1 | 2013-04-11 | |||
| WO2016157896A1 | 2016-10-06 |
Foreign References:
| JP2017525847A | 2017-09-07 | |||
| JPH1068046A | 1998-03-10 |
Attorney, Agent or Firm:
MATSUNUMA Yasushi et al. (JP)
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