STEEL SHEET, MEMBER, AND PRODUCTION METHODS THEREFOR

WIPO Patent Application WO/2024/070890

A1

Provided are: a steel sheet having high strength, excellent in terms of ductility and hole expansibility, and having highly stable mechanical properties along the longitudinal direction of the coil; and a method for producing the steel sheet.　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 coil-longitudinal-direction tensile strength (TS) of 30 MPa or less.

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ASAKAWA TAIYO (JP)
KIMURA HIDEYUKI (JP)
YOSHIOKA SIMPEI (JP)

PCT/JP2023/034300

April 04, 2024

September 21, 2023

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JFE STEEL CORP (JP)

C21D9/46; C22C38/00; C22C38/06; C22C38/60

KUMASAKA Akira et al. (JP)

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