Title:
STEEL SHEET, MEMBER, METHOD FOR PRODUCING SAID STEEL SHEET AND METHOD FOR PRODUCING SAID MEMBER
Document Type and Number:
WIPO Patent Application WO/2023/181485
Kind Code:
A1
Abstract:
Provided is a steel sheet which is less prone to LME cracking, has a composition containing 1.0 mass% or less of Si, achieves a strength of at least 1470 MPa in TS, and has excellent formability and excellent delayed fracture resistance. The steel sheet has a predetermined composition, and has a composite structure mainly composed of martensite and bainite, wherein the maximum diameter of carbides present inside the martensite is 400 nm or less, the number density of the bainite is at least 120×10-4/μm2, and the number percentage of bainite having an aspect ratio of at least 1.8 is 60% or more.
Inventors:
YOSHIOKA SHIMPEI (JP)
HATA KATSUYA (JP)
KIMURA HIDEYUKI (JP)
HATA KATSUYA (JP)
KIMURA HIDEYUKI (JP)
Application Number:
PCT/JP2022/040837
Publication Date:
September 28, 2023
Filing Date:
October 31, 2022
Export Citation:
Assignee:
JFE STEEL CORP (JP)
International Classes:
C21D9/46; C22C38/00; C22C38/14; C22C38/60
Domestic Patent References:
| WO2019208556A1 | 2019-10-31 |
Foreign References:
| JP2021105197A | 2021-07-26 |
Attorney, Agent or Firm:
SUGIMURA Kenji (JP)
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