Dual-phase steel and method thereof

Details Dual-phase steel and method thereof Dual-phase steel and method thereof

C - Chemistry, Metallurgy

21

D

C21D 8/02 (2006.01) C21D 6/02 (2006.01) C21D 8/10 (2006.01) C22C 38/04 (2006.01) C22C 38/12 (2006.01) C22C 38/14 (2006.01) C21D 7/12 (2006.01)

Patent

CA 2207310

A high strength steel composition comprising ferrite and martensite/banite phases, the ferrite phase having primarily vanadium and mobium carbide or carbonitride precipitates, is prepared by a first rolling above the austenite recrystallization temperature; a second rolling below the austenite recrystallization temperature; a third rolling between the Ar3 and Ar1 transformation points, and water cooling to below about 400 °C.

L'invention a pour objet une composition d'acier à haute résistance. Cette composition comprend des phases de ferrite et de martensite/banite, la phase de ferrite comportant principalement des précipités de vanadium et de carbure de mobium. On prépare cette composition en effectuant un premier laminage à une température supérieure à la température de recristallisation de l'austénite; un deuxième laminage à une température inférieure à cette température, et enfin, un troisième laminage entre les points de transformation Ar3 et Ar1 suivi d'un refroidissement à l'eau à moins de 400 DEG C.

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