High strength steel sheet and method for manufacturing the same

Number of patents in Portfolio can not be more than 2000

United States of America

PATENT NO 12221668
APP PUB NO 20220267876A1
SERIAL NO

17770116

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Abstract

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Provided is a high strength steel sheet that has a predetermined chemical composition and is manufactured under optimum conditions, the high strength steel sheet having a steel microstructure including, by area, ferrite: 30% or more and 80% or less, martensite: 5% or more and 35% or less, and retained austenite: 8% or more, wherein the quotient of the area fraction of grains of the retained austenite, the grains having an aspect ratio of 2.0 or more and a minor axis length of 1 μm or less, divided by the total area fraction of the retained austenite is 0.3 or more, wherein the quotient of the average Mn content (mass %) in the retained austenite divided by the average Mn content (mass %) in the ferrite is 1.5 or more.

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Patent Owner(s)

Patent OwnerAddress
JFE STEEL CORPORATION2-3 UCHISAIWAI-CHO 2-CHOME CHIYODA-KU TOKYO 1000011 ?1000011

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Endoh, Kazuki Tokyo, JP 19 1
Kawasaki, Yoshiyasu Tokyo, JP 77 447
Toji, Yuki Tokyo, JP 52 127

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