The tailor ditch level number material and the high-temperature press component and its production mannered null mass for high-temperature

摘要

PROBLEM TO BE SOLVED: To provide a tailored blank material for a hot press in which, when a hot press is applied to a tailored blank material, a laser weld zone or mash seam weld zone is sufficient hardened, thus the phenomenon that the hardenability of the weld zone is made lower than that of the steel sheets to be welded can be actually solved, and to provide a hot-pressed member in which the weld zone is sufficiently hardened by subjecting the tailored blank material for a hot press to a hot press.;SOLUTION: The tailored blank material for a hot press is provided with a laser weld zone or a mash seam weld zone having an oxygen content of ≤0.005%, and a plurality of steel sheets joined by the weld zone have a steel composition comprising 0.08 to 0.45% C, ≤0.5% Si, 0.5 to 3.0% Mn+Cr, ≤0.05% P, ≤0.05% S, ≤1% Al, ≤0.01% N, and the balance Fe with impurities.;COPYRIGHT: (C)2007,JPO&INPIT