| abstract |
The present invention provides a hot stamping formed body having a chemical composition expressed by mass % as follows: C: 0.120% to 0.400%, Si: 0.005% to 2.000%, Mn or Cr or both: The total is 1.00%~3.00%, Al: 0.005%~0.100%, B: 0.0003%~0.0020%, P: 0.030% or less, S: 0.0100% or less, O: 0.0070% or less, N: 0.0070% or less, Ti: 0.%~0.100%, Nb: 0%~0.100%, V: 0%~0.100%, Ni: 0%~2.00%, Cu: 0%~2.00%, Mo: 0%~0.50%, and Ca or REM or both: a total of 0% to 0.0300%, and the remainder: Fe and impurities; and having the following structure: 麻田散铁 or toughened iron or the area fraction of the two: The total coverage is 95% or more, and the coverage of the Osmanian iron grain boundary composed of iron-based carbides is 80% or less, and the number density of iron-based carbides in the primary Austenite iron grains is 45 pieces/μm 2 or more. |