Cold rolled steel sheet and method for producing cold rolled steel sheet

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United States of America Patent

PATENT NO 9920407
SERIAL NO

14370580

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Abstract

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A cold rolled steel sheet according to the present invention satisfies an expression of (5×[Si]+[Mn])/[C]>11 when [C] represents an amount of C by mass %, [Si] represents an amount of Si by mass %, and [Mn] represents an amount of Mn by mass %, a metallographic structure before hot stamping includes 40% to 90% of a ferrite and 10% to 60% of a martensite in an area fraction, a total of an area fraction of the ferrite and an area fraction of the martensite is 60% or more, a hardness of the martensite measured with a nanoindenter satisfies an H2/H1<1.10 and σHM<20 before the hot stamping, and TS×λ which is a product of a tensile strength TS and a hole expansion ratio λ is 50000 MPa·% or more.

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Patent Owner(s)

Patent OwnerAddress
NIPPON STEEL CORPORATION6-1 MARUNOUCHI 2-CHOME CHIYODA-KU TOKYO 100-8071

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Kato, Satoshi Tokyo, JP 103 762
Kawasaki, Kaoru Tokyo, JP 41 291
Nonaka, Toshiki Tokyo, JP 19 108
Tomokiyo, Toshimasa Tokyo, JP 27 86

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