Title:
STEEL SHEET, MEMBER, AND PRODUCTION METHODS THEREFOR
Document Type and Number:
WIPO Patent Application WO/2024/070889
Kind Code:
A1
Abstract:
Provided are: a steel sheet having high strength, excellent in terms of ductility and hole expansibility, and having highly stable mechanical properties along the sheet width direction; a member; and methods for producing the steel sheet and the member. The steel sheet has a composition containing, in terms of mass%, 0.08-0.35% C, 0.4-3.0% Si, 1.5-3.5% Mn, up to 0.02% P, up to 0.01% S, up to 1.0% sol. Al, and up to 0.015% N, the remainder comprising Fe and unavoidable impurities, and has a steel structure in which the areal content of ferrite is 5% or less (including 0%), the total areal content of tempered martensite and lower bainite is 70% or higher, the volume content of retained austenite is 5-15%, and the areal content of fresh martensite is 10% or less (including 0%). The steel sheet has a standard deviation of sheet-width-direction total elongation (EL) of 0.9% or less.
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Inventors:
ASAKAWA TAIYO (JP)
YOSHIOKA SHIMPEI (JP)
KIMURA HIDEYUKI (JP)
YOSHIOKA SHIMPEI (JP)
KIMURA HIDEYUKI (JP)
Application Number:
PCT/JP2023/034299
Publication Date:
April 04, 2024
Filing Date:
September 21, 2023
Export Citation:
Assignee:
JFE STEEL CORP (JP)
International Classes:
C21D9/46; C22C38/00; C22C38/06; C22C38/60
Attorney, Agent or Firm:
KUMASAKA Akira et al. (JP)
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