Martensitic stainless steel for welded structures

C - Chemistry – Metallurgy – 22 – C

Patent

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Details

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.

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