HOT PRESSING METHOD FOR HIGH STRENGTH MEMBER USING STEEL SHEET AND HOT PRESSED PARTS

摘要

The present invention provides a method of hot pressing using hot rolled and cold rolled steel sheet or Al-based plated steel sheet or Zn-based plated steel sheet enabling a strength of at least 1200 MPa to be obtained after high temperature forming and with extremely little possibility of hydrogen embrittlement and such hot pressed parts, that is, a method of hot pressing a high strength automobile parts comprising using steel sheet containing as steel compositions by wt% C:0.05 to 0.5% or steel sheet plated mainly with Al or Zn to produce automobile members by hot pressing during which making the heating temperature before pressing Ac 3 or more to 1100°C or less, making the hydrogen concentration in the heating atmosphere 6 vol% or less, and making the dew point 10°C or less and such hot pressed parts.