Patent ID: 8540933

Claim:
An austenitic stainless steel alloy having the following composition in percent of weight (wt %): 0.02≦C≦0.06 Si<1.0 2.0≦Mn≦6.0 2.0≦Ni≦4.5 17≦Cr≦19 2.0≦Cu≦4.0 0.15≦N≦0.25 0≦Mo≦1.0 0≦W≦0.3 0.035≦V≦0.05 0≦Ti≦0.5 0≦Al≦1.0 0≦Nb≦0.5 0.025≦Co≦0.04 the balance Fe and normally occurring impurities, wherein the contents of the alloying elements are balanced so that the following conditions are fulfilled: Ni eqv −1.42*Cr eqv ≦−13.42; and Ni eqv +0.85*Cr eqv >29.00 wherein Cr eqv =[% Cr]+2*[% Si]+1.5*[% Mo]+5*[% V]+5.5*[% Al]+1.75*[% Nb]+1.5*[% Ti]+0.75*[% W] Ni eqv =[% Ni]+[% Co]+0.5*[% Mn]+0.3*[% Cu]+25*[% N]+30*[% C]; and −37° C.<MD30<−25° C. wherein MD30=(551−462*([% C]+[% N])−9.2*[% Si]−8.1*[% Mn]−13.7*[% Cr]−29*([% Ni]+[% Cu])−68*[% Nb]−18.5*[% Mo])° C.