C - Chemistry – Metallurgy – 22 – C
Patent
C - Chemistry, Metallurgy
22
C
C22C 38/54 (2006.01) C21D 1/18 (2006.01) C21D 8/02 (2006.01)
Patent
CA 2506352
The invention concerns steel building components whereof the chemical composition comprises, by weight: 0.40 % = C = 0.50 %, 0.50 % = Si = 1.50 %, 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 %, AI <= 0.9 %, Si + AI = 2.0 %, optionally at least one element selected among V, Nb, Ta, S and Ca, in contents less than 0.3 %, and among Ti and Zr in contents not more than 0.5 %, the rest being iron and impurities resulting from the preparation, the aluminium, boron, titanium and nitrogen contents, expressed in thousandths of %, of said composition further satisfying the following relationship: B = 1/3 xK+0.5, (1) with K = Min (l*; J*), I*= Max (0;1) and J*=Max(0;J), I = Min(N; N-0.29(Ti-5)), J = Min {N; 0.5 (N-0.52 AI + v(N - 0,52 AI)?2¿ + 283)}, and whereof the structure is bainitic, martensitic or martensitic/bainitic and additionally comprises 3 to 20 % of residual austenite. The invention also concerns a method for making said components.
L'invention concerne des pièces d'acier de construction dont la composition chimique comprend, en poids, 0,40% <= C <= 0,50%, 0,50% <= Si <= 1,50%, 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%, AI S 0,9%, Si + AI <=~2,0%, 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 <= 1/3 xK+0,5, (1) avec K = Min (l*; J*) I*= Max (0;1) et J*=Max(0;J) 1 = Min(N ; N-0,29(Ti-5)) J = Min {N ; 0,5 (N-0,52 AI + .sqroot.(N - 0,52 AI)2 + )}, et dont la structure est bainitique, martensitique ou martensito-bainitique et comprend en outre de 3 à 20% d'austénite résiduelle. Procédé de fabrication.
Beguinot Jean
Brisson Jean-Georges
LandOfFree
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