Formable thin steel sheets and method of producing the same

Details Formable thin steel sheets and method of producing the same Formable thin steel sheets and method of producing the same

C - Chemistry, Metallurgy

21

D

75/118, 148/31

C21D 8/00 (2006.01) C21D 8/04 (2006.01) C22C 38/00 (2006.01) C22C 38/06 (2006.01)

Patent

CA 2005676

A formable thin steel sheet such as hot rolled sheet, cold rolled sheet or surface treated sheet comprises not more than 0.003 wt% of C, not more than 1.0 wt% of Si, not more than 1.0 wt% of Mn, not more than 0.15 wt% of P, not more than 0.02n wt% of S, not more than 0.0045 wt% of O, not more than 0.0020 wt% of N, not more than 0.15 wt% of Al provided that a ratio of Al/N is not less than 30, and the balance being Fe and inevitable impurities, and has not only improved formability for press forming, deep drawing or the like but also improved fatigue resistance as a welded joint.

Cette invention concerne une tôle mince en acier formable, une tôle laminée à chaud, une tôle laminée à froid ou une tôle ayant reçu un traitement de surface par exemple, qui comprend en poids au plus 0,003 % de C, au plus 1,0 % de Si, au plus 1,0 % de Mn, au plus 0,15 % de P, au plus 0,02n % de S, au pus 0,0045 % de O, au plus 0, 15 % d'Al à condition que le rapport Al/N ne dépasse par 30, le reste étant du Fe et des impuretés inévitable. La tôle objet de l'invention se caractérise non seulement par une formabilité améliorée à la presse, par emboutissage profond ou autres procédés analogues, mais aussi par une plus grande résistance à la rupture par fatigue aux soudures.

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