C - Chemistry – Metallurgy – 22 – C
Patent
C - Chemistry, Metallurgy
22
C
C22C 38/00 (2006.01) C22C 38/58 (2006.01)
Patent
CA 2661655
Disclosed is a martensitic stainless steel for a welded structure, which comprises (by mass): C: 0.001-0.05%; Si: 0.05-1%; Mn: 0.05-2%; P: 0.03% or less; REM: 0.0005-0.1%; Cr: 8-16%; Ni: 0.1-9%; sol.Al: 0.001-0.1%; at least one member selected from Ti: 0.005-0.5%, Zr: 0.005-0.5%, Hf: 0.005-0.5%, V: 0.005-0.5% and Nb: 0.005-0.5%; O: 0.005% or less; and N: 0.1% or less, with the remainder being Fe and impurities, wherein the contents of P and REM satisfy the requirements represented by the following formula: P<=0.6xREM. The steel has excellent SCC resistance at a welded part in the sweet environment.
L'invention concerne un acier inoxydable martensitique pour structure soudée, contenant (en masse) : C : 0,001-0,05% ; Si : 0,05-1% ; Mn : 0,05-2% ; P : 0,03% ou inférieur ; REM : 0,0005-0,1% ; Cr : 8-16% ; Ni : 0,1-9% ; Al sol. : 0,001-0,1% ; au moins un élément choisi parmi Ti : 0,005-0,5%, Zr : 0,005-0,5%, Hf : 0,005-0,5%, V : 0,005-0,5% et Nb : 0,005-0,5% ; O : 0,005% ou inférieur ; et N : 0,1% ou inférieur, le reste étant constitué par Fe et des impuretés, la teneur en P et en REM satisfaisant à la formule suivante : P<=0,6xREM. L'acier selon l'invention présente une excellente résistance SCC au niveau d'une partie soudée dans un environnement doux.
Amaya Hisashi
Ogawa Kazuhiro
Takabe Hideki
Taniyama Akira
Ueda Masakatsu
Gowling Lafleur Henderson Llp
Sumitomo Metal Industries Ltd.
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