Title:
STEEL SHEET
Document Type and Number:
WIPO Patent Application WO/2021/255855
Kind Code:
A1
Abstract:
This steel sheet has a prescribed chemical composition, and is such that: a ratio Mn/Ni of Mn content to Ni content is at most 0.80; the carbon equivalent CeqWES is 0.43-0.70% (inclusive); the tensile strength is 780-930 MPa (inclusive); the yield strength is 630-750 MPa (inclusive); the yield ratio is at most 85%; the sheet thickness is 40-120 mm (inclusive); and Hvmin/Hvmax is at most 0.85, where Vickers hardness is measured at 225 or more positions that are 1/4 of the sheet thickness from the surface of the steel sheet, Hvmin is the average value of the values ascending from the lowest Vickers hardness to 20%, and Hvmax is the average value of the values descending from the greatest Vickers hardness to 20%.
Inventors:
TANAKA SHUN (JP)
SHIGESATO GENICHI (JP)
HONMA RYUICHI (JP)
KOJIMA AKIHIKO (JP)
YOSHIMURA NOBUYUKI (JP)
SHIGESATO GENICHI (JP)
HONMA RYUICHI (JP)
KOJIMA AKIHIKO (JP)
YOSHIMURA NOBUYUKI (JP)
Application Number:
PCT/JP2020/023746
Publication Date:
December 23, 2021
Filing Date:
June 17, 2020
Export Citation:
Assignee:
NIPPON STEEL CORP (JP)
International Classes:
C22C38/00; C22C38/54; C21D8/02
Domestic Patent References:
| WO2013051231A1 | 2013-04-11 |
Foreign References:
| JP2012172243A | 2012-09-10 | |||
| JP2013194316A | 2013-09-30 | |||
| JP2007247004A | 2007-09-27 | |||
| US20100263773A1 | 2010-10-21 |
Attorney, Agent or Firm:
TANAI Sumio et al. (JP)
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