C - Chemistry – Metallurgy – 21 – D
Patent
C - Chemistry, Metallurgy
21
D
C21D 8/10 (2006.01) B21B 19/04 (2006.01) C22C 38/02 (2006.01) C22C 38/04 (2006.01) C22C 38/32 (2006.01)
Patent
CA 2600580
The present invention provides a martensitic stainless steel seamless pipe, characterized by consisting of C: 0.15 to 0.22%, Si: 0.1 to 1.0%, Mn: 0.10 to 1.00%, Cr: 12.00 to 14.00%, P: 0.020% or less, S: 0.010% or less, N: 0.05% or less, O(Oxygen): 0.0060% or less, at least one alloying element selected from V, Nb and Ti of 0.005 to 0.200% and B of 0.0005 to 0.0100%, and the balance Fe and impurities, satisfying at least the following inequalities (1), (4) and (5): C*+10N*<=0.45, and preferably <= 0.322 (1) Cr*<=9.0, (4) S<=0.088N*+0.00056, (5) Cr* < 0.00009 (C.A. + F.A.) 0.0035 (C.A. + F.A.) 2 + 0.0567 (C.A. + F.A.) + 8.0024 (9).
L'invention concerne un tuyau en acier inoxydable martensitique dans lequel la composition d'acier va comme suit : C : de 0,15 ;à 0,22 %; Si : de 0,1 à 1,0 %; Mn : de 0,10 à 1,00 %; Cr : de 12,00 à 14,00 %; P : 0,020 % ou moins; S : 0,010 % ou moins; N : 0,0 5% ou moins; O(Oxygène) : 0,0060 % ou moins; au moins un élément d'alliage parmi V, Nb et Ti (de 0,005 à 0,200 %) et B (de 0,0005 à 0,0100 %), et le reste, Fe et impuretés, satisfaisant à au moins une des inégalités suivantes - (1), (4) et (5) : C*+10N*<=0,45, et de préférence <= 0,322 (1) Cr*<=9,0, ~~~~~~~(4) S<=0,088N*+0,00056, ~~~~~(5) Cr* < 0,00009 (C.A. + F.A.) 0,0035 (C.A. + F.A.) 2 + 0,0567 (C.A. + F.A.) + 8,0024 ~~~~(9).
Kidani Shigeru
Tanida Mutsumi
Gowling Lafleur Henderson Llp
Sumitomo Metal Industries Ltd.
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