High-strength steel sheet and method for producing the same

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United States of America

PATENT NO 12258645
APP PUB NO 20220098698A1
SERIAL NO

17426897

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Abstract

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A high-strength steel sheet having a low yield ratio and a method for producing the same. The high-strength steel sheet has a specified chemical composition and a microstructure in which ferrite is present as a major phase, and martensite is present in an area fraction of 10% or greater and less than 50% relative to an entire area of the microstructure. The martensite has an average grain diameter of 3.0 μm or less, in an entirety of the martensite, a proportion of martensite having an aspect ratio of 3 or less is 60% or greater, and the martensite having an aspect ratio of 3 or less has a carbon concentration of 0.30% or greater and 0.90% or less in mass %.

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Patent Owner(s)

Patent OwnerAddress
JFE STEEL CORPORATIONTOKYO 100-0011

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Hirashima, Takuya Tokyo, JP 26 38
Honda, Yuma Tokyo, JP 16 10
Kaneko, Shinjiro Tokyo, JP 88 617
Nakamura, Akinori Tokyo, JP 14 46

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