| 摘要 |
PROBLEM TO BE SOLVED: To provide a hot press method for a hot rolled or cold rolled steel sheet, or Al-based plated or Zn-based plated steel sheet, by which a strength of 1,200 MPa or more can be achieved after high temperature forming, and also risk of hydrogen embrittlement can be reduced significantly, and to provide hot pressed parts. SOLUTION: In the hot press method, an automotive member is manufactured by hot-pressing the steel sheet or the steel sheet plated mainly with Al or Zn, which contains 0.05-0.5 mass%: C. The heating temperature prior to hot-pressing is controlled to Ac3 or above and 1,100°C or less, and the heating atmosphere is controlled to have hydrogen content of 6 vol.% or less and a dew point of 10°C or less. COPYRIGHT: (C)2006,JPO&NCIPI |
