B - Operations – Transporting – 21 – D
Patent
B - Operations, Transporting
21
D
B21D 22/20 (2006.01) B21D 53/88 (2006.01) C23C 2/06 (2006.01) C23C 2/12 (2006.01) C23C 2/40 (2006.01)
Patent
CA 2573226
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 Ac3 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.
Méthode d'emboutissage à chaud pour pièces automobile à haute résistance par laquelle les pièces sont obtenues par l'utilisation d'une tôle d'acier, comme composant acier d'une teneur de 0,05 à 0,5% en poids de carbone ou d'une tôle d'acier plaquée avec de l'aluminium ou du zinc comme composant principal, et par l'emploi d'une méthode d'emboutissage à chaud, caractérisée par le fait que la température de chauffe avant emboutissage est Ac<sub
Abe Masayuki
Fujita Norihiro
Kusumi Kazuhisa
Maki Jun
Nakajima Shinya
Goudreau Gage Dubuc
Nippon Steel Corporation
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