C - Chemistry – Metallurgy – 22 – C
Patent
C - Chemistry, Metallurgy
22
C
C22C 38/08 (2006.01) C22C 19/00 (2006.01) H01F 10/12 (2006.01)
Patent
CA 2682233
The invention relates to an austenitic iron/nickel/chromium/copper alloy, the composition of which comprises in % by weight: 24% <= Ni <= 36%; Cr >= 0.02%; Cu >= 0.1%; Cu + Co <= 15%; 0.01 <= Mn <= 6%; 0.02 <= Si <= 2%; 0 <= Al + Ti <= 3%; 0 <= C <= 2%; 0 <= V + W <= 6%; 0 <= Nb + Zr <= 0.5%; 0 <= Mo <= 8; Sn <= 1; 0 <= B <= 0.006%; 0 <= S + Se + Sb <= 0.008%; 0 <= Ca + Mg <= 0.020%; the reminder being iron and impurities resulting from the smelting, the percentages of nickel, chromium, copper and cobalt being such that the alloy also meets the following conditions: Co < Cu; Co < 4% if Cr > 7.5%; Eq1 > 28% where Eq1 = Ni + 1.2 Cr + (Cu/5); Cr < 7.5% if Ni > 32.5%, and the manganese content also meeting the following conditions : if Eq3 >= 205, Mn <= Ni - 27.5 + Cu - Cr; if 180.5 <= Eq3 <= 205, Mn <= 4%; if Eq3 <= 180.5, Mn < 2% where Eq3 = 6Ni - 2.5X + 4(Cu+Co) and X = Cr+Mo+V+W+Si+Al.
L'invention concerne un alliage austénitique fer-nickel-chrome-cuivre dont la composition comprend en % en poids : 24 % <= Ni <= 36 %; Cr >= 0,02 %; Cu >= 0,1 %; Cu + Co <= 15 %; 0,01 <= Mn <= 6 %; 0,02 <= Si <= 2 %; 0 <= Al + Ti <= 3 %; 0 <= C <= 2 %; 0 <= V + W <= 6 %; 0 <= Nb + Zr <= 0,5 %; 0 <= Mo <= 8; Sn <= 1; 0 <= B <= 0,006 %; 0 <= S + Se + Sb <= 0,008 %; 0 <= Ca + Mg <= 0,020 %; le reste étant du fer et des impuretés résultant de l'élaboration, les pourcentages en nickel, chrome, cuivre, cobalt étant tels que l'alliage satisfait en outre les conditions suivantes : Co < Cu; Co < 4 % si Cr > 7,5 %; Eq1 > 28 % avec Eq1 = Ni + 1,2Cr + (Cu/5); Cr < 7,5 % si Ni > 32,5 %, et la teneur en manganèse respectant en outre les conditions suivantes : si Eq3 >= 205, Mn <= Ni - 27,5 + Cu - Cr; si 180,5 <= Eq3 <= 205, Mn <= 4 %; si Eq3 <= 180,5, Mn < 2 % avec Eq3 = 6Ni - 2,5X + 4(Cu+Co) et X = Cr+Mo+V+W+Si+Al.
Danylova Olena
Waeckerle Thierry
Arcelormittal-Stainless & Nickel Alloys
Norton Rose Or S.e.n.c.r.l. S.r.l./llp
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