Title:
HIGH-STRENGTH STEEL PLATE
Document Type and Number:
WIPO Patent Application WO/2020/022477
Kind Code:
A1
Abstract:
Provided is a high-strength steel plate which contains, in mass%, C in the amount of 0.05-0.15%, Si in the amount of 1.5% or less, Mn in the amount of 2.00-5.00%, P in the amount of 0.100% or less, S in the amount of 0.010% or less, Al in the amount of 0.001-2.000%, and N in the amount of 0.010% or less, with the remainder constituting Fe and impurities, wherein: Ceq, which is defined by Ceq=C+Si/90+Mn/100+1.5P+3S, is less than 0.21; the martensite content by area ratio is at least 98%, and remaining structures occupy an area ratio of 2% or less; the two-dimensional homogeneity variance ratio S, which is defined by S=Sy2/Sx2 (Sx2 is the variance value of the Mn concentration profile data in the plate width direction, and Sy2 is the variance value of the Mn concentration profile data in the plate thickness direction), is 0.85-1.20, inclusive; and the tensile strength of the plate is 1,200 MPa or higher.
Inventors:
NAGANO MAI (JP)
HAYASHI KOUTAROU (JP)
UENISHI AKIHIRO (JP)
HAYASHI KOUTAROU (JP)
UENISHI AKIHIRO (JP)
Application Number:
PCT/JP2019/029384
Publication Date:
January 30, 2020
Filing Date:
July 26, 2019
Export Citation:
Assignee:
NIPPON STEEL CORP (JP)
International Classes:
C22C38/00; C22C38/06; C22C38/58; C21D9/46
Foreign References:
| JPH0387320A | 1991-04-12 | |||
| JP2017504720A | 2017-02-09 | |||
| KR20060132378A | 2006-12-21 |
Attorney, Agent or Firm:
TANAI Sumio et al. (JP)
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