Shape steel material having high strength, high toughness...

Details Shape steel material having high strength, high toughness... Shape steel material having high strength, high toughness...

C - Chemistry, Metallurgy

21

C

C21C 7/06 (2006.01) B21B 1/00 (2006.01) C21D 7/13 (2006.01) C21D 8/00 (2006.01) C21D 9/00 (2006.01) C22C 38/04 (2006.01) C22C 38/14 (2006.01)

Patent

CA 2106616

After a predeoxidation treatment of a molten steel comprising as basic ingredients, in terms of % by weight, 0.04 to 0.20% of C, 0.05 to 0.50% of Si, 0.4 to 2.0% of Mn, 0.3 to 0.7% of Mo, 0.003 to 0.015% of N, 0,04 to 0.20% of v and less than 0.005% of Al to regulate [O%] to 0.003 to 0.015% by weight, titanium is added thereto so as to satisfy a requirement represented by the formula: -0.006 ~ [Ti%] - 2 [O%] ~ 0.008 to crystallize a titanium-based oxide in an amount of 20 particles/mm2 or more, and MnS, TiN and V(C, N) are deposited on the titanium-based oxide to disperse the titanium-based oxide as a composite precipitate in the steel to provide a cast slab, and a high-strength high-toughness shape steel having an excellent fire resistance is provided by a combination of water cooling between rolling passes at the time of rolling with accelerated cooling after the completion of the rolling.

Après un traitement de prédésoxydation, de l'acier en fusion contenant (en termes de pourcentage de poids) 0,04 à 0,20 % de C, 0,05 à 0,50 % de Si, 0,4 à 2,0 % de Mn, 0,3 à 0,7 % de Mo, 0,003 à 0,015% de N, 0,04 à 0, 20 % de V et moins de 0,005 % d'Al pour réguler [0 % à 0,003 à 0,015 % en poids, du titane est ajouté de façon à satisfaire à la formulation -0,006 ~[Ti % - 2 [0 % ~0,008 pour cristalliser un oxyde à base de titane dans une proportion de 20 particules/mm ou plus, et du MnS, du TiN et du V(C, N) sont déposés sur l'oxyde à base de titane pour disperser celui-ci comme précipité composite dans l'acier afin de produire une brame laminée et un profilé d'acier haute résistance et haute dureté possédant d'excellentes caractéristiques de résistance au feu en combinant un refroidissement par eau entre les passes de laminage, suivi d'un refroidissement accéléré au terme de l'opération de laminage.

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