Hot stamped and manufacturing method thereof
2013
Wherein hot stamped according to the present invention is that, when the C content (% by mass), Si content (mass%), and Mn content (mass%) are represented by [C], [Si] and [Mn], the establishment of (5 × [Si] + [Mn]) relationship / [C]> 10, the metal structure containing an area ratio of martensite is 80% or more, may also contain an area ratio of 10% or less of pearlite , volume fraction of residual austenite is 5% or less, an area ratio of 20% or less of ferrite and bainite area ratio of less than 20% of one or more, and tensile strength TS i.e. product of a hole expansion ratio [lambda] TS × λ or more 50000MPa ·%, the hardness of martensite was measured nanoindenter satisfies H2 / H1 <1.10 and σHM <20.
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