| 摘要 |
PROBLEM TO BE SOLVED: To provide an automobile high strength member in which hydrogen embrittlement sensitivity caused by postworking after hot pressing can be secured without being subjected to dehydrogenation treatment in a method for forming the automobile high strength member by hot pressing, and to provide the hot pressing method. SOLUTION: In the high strength automobile member, the thickness of its surface layer is 1 nm to 300μm, the dislocation density of the surface layer is≤1/100 to the dislocation density of the internal layer steel, and the internal layer steel has chemical components comprising, by mass, 0.1 to 0.8% C and 0.5 to 3% Mn, and has a tensile strength of≥980 N/mm<SP>2</SP>. COPYRIGHT: (C)2006,JPO&NCIPI
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