Austenitic stainless steel welded joint and austenitic...

C - Chemistry – Metallurgy – 22 – C

Patent

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C22C 38/40 (2006.01) B23K 31/12 (2006.01) B23K 35/22 (2006.01) B23K 35/24 (2006.01) C22C 19/05 (2006.01) C22C 30/00 (2006.01) C22C 38/04 (2006.01) C22C 38/06 (2006.01) C22C 38/58 (2006.01)

Patent

CA 2674091

An austenitic stainless steel welded joint where the base metal and the weld metal contain by mass C: 0.3% or below, Si: 2% or below, Mn: 0.01 to 3.0%, P: more than 0.04% to 0.3%, S: 0.03% or below, Cr: 12 to 30%, Ni: 6 to 55%, rare earth elements: more than 0.2% to 0.6%, sol. Al: 0.001 to 3% and N: 0.3% or below with the balance being Fe and impurities and satisfy the relationship: (Cr+1.5~Si+2~P)/(Ni+0.31~Mn+22~C+14.2~N+5~P)<1.388. The welded joint is excellent in weld solidification cracking resistance, though it has a high P content and causes complete austenitic solidification. Thus, the joint is widely applicable to fields requiring welding. In the above relationship, each atomic symbol represents the content of the element by mass%.

L'invention concerne un joint soudé d'acier inoxydable austénitique où le métal de base est le métal de soudure contiennent en masse C: 0,3% ou moins Si: 2% ou moins, Mn: 0,01 à 3,0%, P: plus de 0,04% à 0,3%, S: 0,03% ou moins, Cr: 12 à 30%, Ni: 6 à 55%, éléments des terres rares: plus de 0,2% à 0,6%, Al sol: 0,001 à 3% et N: 0,3% ou moins, le complément étant constitué par Fe et les impuretés et satisfaisant la relation: (Cr+1.5~Si+2~P)/(Ni+0,31~Mn+22~C+14,2~N+5~P)<1,388. Le joint soudé offre une excellente résistance à la fissuration par solidification de soudure, bien qu'il possède une teneur en P élevée et provoque une solidification austénitique complète. Ainsi, le joint est largement applicable aux domaines nécessitant une soudure. Dans la relation ci-dessus, chaque symbole atomique représente la teneur de l'élément en % en masse.

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