High strength steel sheet, impact absorbing member, and method for manufacturing high strength steel sheet

Number of patents in Portfolio can not be more than 2000

United States of America

PATENT NO 12180593
APP PUB NO 20240052449A1
SERIAL NO

17766398

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Abstract

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A high strength steel sheet has a yield-point elongation of 1% or greater and a tensile strength of 980 MPa or greater. The high strength steel sheet has a specific chemical composition and microstructure. A ratio of retained austenite grains adjoining a retained austenite grain having a different crystal orientation to total retained austenite grains is 0.60 or greater, the ferrite has an average grain size of 5.0 μm or less, and the retained austenite has an average grain size of 2.0 μm or less. A value obtained by dividing a volume fraction Vγa by a volume fraction Vγb is 0.40 or greater, where the volume fraction Vγa is a volume fraction of retained austenite in a fractured portion of a tensile test specimen after a warm tensile test at 150° C., and the volume fraction Vγb is a volume fraction of retained austenite before the warm tensile test at 150° C.

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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
Futatsuka, Takayuki Tokyo, JP 19 46
Iwasawa, Muneka Tokyo, JP 2 0
Kawasaki, Yoshiyasu Tokyo, JP 77 447
Sato, Kentaro Tokyo, JP 43 377
Toji, Yuki Tokyo, JP 52 127

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