| 摘要 |
PROBLEM TO BE SOLVED: To provide a member requiring strengths used for automobile structural members and reinforcing members, to provide a component having excellent strengths particularly after high temperature forming, and to provide a production method therefor. SOLUTION: In the subject method for producing a high strength component, at the time when a steel sheet having a composition comprising, by mass, 0.05 to 0.55% C,≤2% Si, 0.1 to 3% Mn,≤0.1% P and≤0.03% S, and the balance Fe with inevitable impurities composed of Al, Cr, N, Ti, B, or the like, is heated to Ac<SB>3</SB>to a melting point in an atmosphere having a hydrogen content of≤10% in a volume fraction and a dew point of≤30°C, thereafter, press forming is started at a temperature higher than a temperature at which ferritic, pearlitic and martensitic transformations occur, and, after the forming, in a die, it is cooled and quenched, so as to produce a component having high strengths, the cooling rate in a part of the component is reduced, thus the part having strengths lower than those of the other part is provided, and the part is subjected to shearing working. The high strength component is produced by this method. COPYRIGHT: (C)2006,JPO&NCIPI
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