Patent ID: 7867344

Claim:
A method for hot pressing a high-strength automobile part to prevent hydrogen embrittlement, the method comprising: providing a steel sheet comprising a plating layer that is at least about 50 g/m 2 on one side of the steel sheet, and containing between about 0.05 and 0.5 wt % C; heating the steel sheet to a temperature between about an Ac 3 temperature and about 1100° C. in an atmosphere; controlling a hydrogen concentration of the atmosphere to be not more than about 0.5 vol %, a dew point of the atmosphere to be not more than about 10° C., and an oxygen concentration of the atmosphere to be between about 0.3 and 21 vol %; and hot pressing the steel sheet after the steel sheet is heated, wherein the steel sheet is hot pressed by: (i) introducing the steel sheet into a press machine, and (ii) providing a clearance between a die and a punch during the hot pressing procedure that is between about 1.0 and about 1.8 times of the thickness of the steel sheet.