Title:
STEEL SHEET, MEMBER, METHOD FOR PRODUCING STEEL SHEET, AND METHOD FOR PRODUCING MEMBER
Document Type and Number:
WIPO Patent Application WO/2022/209519
Kind Code:
A1
Abstract:
Provided is a steel sheet having a tensile strength of 1310 MPa or higher, the steel sheet enabling excellent press moldability in steel having mainly a martensitic structure having excellent delayed fracture resistance. The steel sheet is characterized by: having a component composition including, in terms of mass%, 0.12% to 0.40% C, 1.5% or less Si, 1.7% or less Mn, 0.05% or less P, 0.010% or less S, 1.00% or less sol. Al, 0.010% or less N, 0.002% to 0.080% Ti, and 0.0002% to 0.0050% B, the remainder being Fe and unavoidable impurities, and a metal structure in which an area ratio of martensite to the entire structure is 95% or higher and a ratio LS/LB of a length LS of a sub-block boundary to a length LB of a block boundary in the martensite satisfies a prescribed equation (1); and the tensile strength being 1310 MPa or higher.
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Inventors:
YOSHIOKA SHIMPEI (JP)
KANEKO SHINJIRO (JP)
HONDA YUMA (JP)
KANEKO SHINJIRO (JP)
HONDA YUMA (JP)
Application Number:
PCT/JP2022/008468
Publication Date:
October 06, 2022
Filing Date:
February 28, 2022
Export Citation:
Assignee:
JFE STEEL CORP (JP)
International Classes:
C21D9/46; C22C38/00; C22C38/14; C22C38/60
Domestic Patent References:
| WO2016152163A1 | 2016-09-29 | |||
| WO2018062381A1 | 2018-04-05 | |||
| WO2021149676A1 | 2021-07-29 |
Foreign References:
| JP2010215958A | 2010-09-30 | |||
| JP6017341B2 | 2016-10-26 | |||
| JP2019002078A | 2019-01-10 |
Attorney, Agent or Firm:
SUGIMURA Kenji (JP)
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