Weldable steel building component and method for making same

Details Weldable steel building component and method for making same Weldable steel building component and method for making same

C - Chemistry, Metallurgy

22

C

C22C 38/54 (2006.01) C21D 1/18 (2006.01) C21D 8/02 (2006.01) C22C 38/44 (2006.01) C21D 9/46 (2006.01)

Patent

CA 2506353

The invention concerns weldable steel building components whereof the chemical composition comprises, by weight: 0.10 % <= C <= 0,22 %, 0.50 % <= Si <= 1.50 %, AI <= 0.9 %, 0 % <= Mn <= 3 %, 0 % <= Ni <= 5 %, 0 % <= Cr <= 4 %, 0 % <= Cu <= 1 %, 0 % <= Mo + W/2 <= 1.5 %, 0.0005 % <= B < 0.010 %, N <= 0.025 %, optionally at least one element selected among V, Nb, Ta, S et Ca, in contents less than 0.3 %, and/or among Ti and Zr in contents not more than 0.5 %, the rest being iron and impurities resulting from preparation, the aluminium, boron, titanium and nitrogen contents, expressed in thousandths of %, of said composition further satisfying the following relationship: B <= 1/3 x K+ 0.5, (1) with K = Min (l*; J*), I* = Max (0; I) and J* = Max (0; J), I = Min(N; N-0.29(Ti-5)), J = Min {N; 0.5 (N 0.52 AI + .sqroot.j(N 0.52 AI)?2¿ + 283)}, the silicon and aluminium contents of the composition additionally verifying the following conditions: if C > 0.145, then Si + AI < 0.95 and whereof the structure is bainitic, martensitic or martensitic/bainitic and further comprises 3 to 20 % of residual austenite.

L'invention concerne des pièces d'acier de construction soudable dont la composition chimique comprend, en poids, 0,10% < C < 0,22%, 0,50% < Si < 1,50%, AI < 0,9%, 0% < Mn < 3%, 0% < Ni < 5%, 0% < Cr < 4%, 0% < Cu < 1 %, 0% < Mo + W/2 < 1,5%, 0,0005% < B < 0,010%, N < 0,025%, éventuellement au moins un élément pris parmi V, Nb, Ta, S et Ca, en des teneurs inférieures à 0,3%, et/ou parmi Ti et Zr en des teneurs inférieures ou égales à 0,5%, le reste étant du fer et des impuretés résultant de l'élaboration, les teneurs en aluminium, en bore, en titane et en azote, exprimées en millièmes de %, de ladite composition satisfaisant en outre la relation suivante B >_ 3 xK+0,5, (1) avec K = Min (l* ; J*) I* = Max (0 ; I) et J* = Max (0; J) 1 = Min(N ; N- 0,29(Ti-5)) J = Min N ; 0,5 N - 0,52 AI + j(N - 0,52 AI)2 + 283 les teneurs en silicium et en aluminium de la composition vérifiant en outre les conditions suivantes si C > 0,145, alors Si + AI < 0,95 et dont la structure est bainitique, martensitique ou martensito-bainitique et comprend en outre de 3 à 20% d'austénite résiduelle. Procédé de fabrication.

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