| 摘要 |
<p>A hot-stamp-molded article comprising, in mass%, 0.20 to 0.35% of C, 0.1 to 0.5% of Si, at least one element selected from Mn and Cr in the total amount of 1 to 3%, 0.005 to 0.06% of Al, 0.002 to 0.1% of Ti, 0.002 to 0.1% of Nb, 0.003 to 0.007% of O, 0.015% or less of P, 0.01% or less of S, 0.004% or less of N, and a remainder made up by Fe and unavoidable impurities, wherein the dimensional ratio of the length of a prior austenite grain in the rolling direction to that in the thicknesswise direction is 1.3 to 2.5 inclusive, the prior austenite grain has an average particle diameter of 6 µm or less, martensite is contained at a proportion of 98% or more, and the tensile strength is 1470 MPa or more.</p> |
