Cold rolled steel sheet and method for producing cold rolled steel sheet
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United States of America Patent
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Mar 20, 2018
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app pub date -
Jan 11, 2013
filing date -
Jan 13, 2012
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Abstract
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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