Austenitic stainless steel

Details Austenitic stainless steel Austenitic stainless steel

C - Chemistry, Metallurgy

22

C

C22C 38/50 (2006.01) C22C 30/00 (2006.01) C22C 38/04 (2006.01) C22C 38/06 (2006.01) C22C 38/44 (2006.01) C22C 38/46 (2006.01) C22C 38/48 (2006.01) C22C 38/52 (2006.01) C22C 38/54 (2006.01) C22C 38/58 (2006.01)

Patent

CA 2603681

An austenitic stainless steel improved in creep strength, creep ductility, weldability and also hot workability. The steel, consisting of, by mass %, C: 0.05-0.15 %, Si: not more than 2 %, Mn: 0.1-3%, P: 0.05-0.30 %, S: not more than 0.03 %, Cr: 15-28 %, Ni: 8-55 %, Cu: 0-3.0 %, Ti: 0.05-0.6 %, REM: 0.001-0.5 %, sol. Al: 0.001-0.1%, N: not more than 0.03 %, and the balance being Fe and incidental impurities. This steel may contain one or more of Mo, W, B, Nb, V, Co, Zr, Hf, Ta, Mg and Ca. It is preferable that REM is Nd.

La présente invention concerne un acier inoxydable austénitique de haute résistance au fluage dont la ductilité au fluage, la soudabilité et la malléabilité à chaud sont améliorées. Cet acier contient, en pourcentage massique, 0,05-0,15 % de C, pas plus de 2 % de Si, 0,1-3 % de Mn, 0,05-0,30 % de P, pas plus de 0,03 % de S, 15-28 % de Cr, 8-55 % de Ni, 0-3,0 % de Cu, 0,05-0,6 % de Ti, 0,001-0,5 % de métal de terre rare, 0,001-0,1 % de solution d~Al, pas plus de 0,03 % de N, le reste étant du Fe et des impuretés inévitables. Cet acier peut en outre contenir un élément ou plus sélectionné parmi Mo, W, B, Nb, V, Co, Zr, Hf, Ta, Ca et Mg. Il est conseillé d~utiliser Nd comme métal de terre rare.

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