HOT STAMP MOLDED ARTICLE, AND METHOD FOR PRODUCING HOT STAMP MOLDED ARTICLE

摘要

A hot stamped steel 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 after 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 ÃHM < 20, and TS × » which is a product of a tensile strength TS and a hole expansion ratio » is 5000MPa·% or more.