High strength cold-rolled steel sheet and manufacturing method therefor

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United States of America Patent

PATENT NO 9708697
SERIAL NO

14400453

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Abstract

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In a steel sheet having a specific chemical composition and having a microstructure including ferrite that is a soft first phase by 20-50% in terms of the area ratio, the remainder being tempered martensite and/or tempered bainite that is a hard second phase, the microstructure of steel of a surface layer section of the steel sheet from the surface to the depth of 100 μm and a center section of t/4-3t/4 (t is the sheet thickness) is controlled.

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Patent Owner(s)

Patent OwnerAddress
KABUSHIKI KAISHA KOBE SEIKO SHO (KOBE STEEL LTD )2-4 WAKINOHAMA-KAIGANDORI 2-CHOME CHUO-KU KOBE-SHI HYOGO 651-8585

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Ikeda, Muneaki Kakogawa, JP 24 125
Kajihara, Katsura Kobe, JP 33 199
Masuda, Tomokazu Kobe, JP 45 463
Miura, Masaaki Kakogawa, JP 40 278
Murakami, Toshio Kobe, JP 98 1077

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