| 摘要 |
PROBLEM TO BE SOLVED: To provide a high strength hardened molded body having excellent corrosion resistance and fatigue resistance, in which, in a zinc based plated steel, the corrosion resistance of a molded part after hardening is made equal to or above that of a cold-molded product. SOLUTION: The high strength hardened molded body is obtained by heating a zinc plated-base steel for hot stamping and performing molding and hardening, the surface of the steel of the molded body after the hardening is formed with a galvanizing layer essentially consisting of Zn, and in which the content of Fe is controlled to 9 to 30 mass% by≥30g/m<SP>2</SP>according to the following measurement method; wherein electrolysis is performed to aΓlayer at a point remarkably changed to≤-800 mVvs.SCE by constant current electrolysis with a saturated calomel electrode in 4mA/cm<SP>2</SP>as a reference electrode in an aqueous solution of NH<SB>4</SB>Cl: 150 g/l, and, in the electrolytic solution, the contents of Fe and Zn and a compositional ratio are measured by ICP. COPYRIGHT: (C)2011,JPO&INPIT |
