High-strength steel sheet and method for manufacturing same

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United States of America Patent

PATENT NO 10954578
APP PUB NO 20170314091A1
SERIAL NO

15520236

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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Disclosed is a steel sheet having a predetermined chemical composition and a steel microstructure that contains, in area ratio, 35% or more and 80% or less of polygonal ferrite and 5% or more and 25% or less of martensite, and that contains, in volume fraction, 8% or more of retained austenite, in which the polygonal ferrite, the martensite, and the retained austenite have a mean grain size of 6 μm or less, 3 μm or less, and 3 μm or less, respectively, and each have a mean grain aspect ratio of 2.0 or less, and in which a value obtained by dividing an Mn content in the retained austenite in mass % by an Mn content in the polygonal ferrite in mass % equals 2.0 or more.

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Patent Owner(s)

Patent OwnerAddress
JFE STEEL CORPORATIONTOKYO 100-0011

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Kawasaki, Yoshiyasu Tokyo, JP 77 447
Matsuda, Hiroshi Tokyo, JP 474 5592
Seto, Kazuhiro Tokyo, JP 52 388
Yamashita, Takako Tokyo, JP 28 78
Yokota, Takeshi Tokyo, JP 110 1019

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