High-strength steel sheet and production method therefor

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United States of America Patent

PATENT NO 11401595
APP PUB NO 20190226067A1
SERIAL NO

16326784

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Abstract

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A high-strength steel sheet having a TS of 780 MPa or more, excellent stretch flangeability, and excellent in-plane anisotropy of TS is provided. A high-strength steel sheet comprises: a predetermined chemical composition; a steel microstructure including, in area fraction, ferrite: 20% or more and 50% or less, lower bainite: 5% or more and 40% or less, martensite: 1% or more and 20% or less, and tempered martensite: 20% or less, and including, in volume fraction, retained austenite: 5% or more, the retained austenite having an average grain size of 2 μm or less; and a texture having an inverse intensity ratio of γ-fiber to α-fiber of 3.0 or less.

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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
Kaneko, Shinjiro Tokyo, JP 88 617
Minami, Hidekazu Tokyo, JP 46 105
Mori, Kazuma Tokyo, JP 23 40
Sugihara, Reiko Tokyo, JP 35 138
Tahara, Kazunori Tokyo, JP 7 34

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