Patent ID: 8097098

Claim:
Martensitic stainless steel, characterised in that its composition is, in percentages by weight: 9%≦Cr≦13% 1.5%≦Mo≦3% 8%≦Ni≦14% 1%≦Al≦2% 0.5%≦Ti≦1.5% with Al+Ti≧2.25% traces≦Co≦2% traces≦W≦1% with Mo+(W/2)≦3% traces≦P≦0.02% traces≦S≦0.0050% traces≦N≦0.0060% traces≦C≦0.025% traces≦Cu≦0.5% traces≦Mn≦3% traces≦Si≦0.25% traces≦O≦0.0050% and is such that: M S (° C.)=1302−42Cr−63Ni−30Mo+20Al−15W−33Mn−28Si−30Cu−13Co+10Ti≧50 Cr eq/Ni eq≦1.05 with Cr eq (%)=Cr+2Si+Mo+1.5Ti+5.5Al+0.6W Ni eq (%)=2Ni+0.5Mn+30C+25N+Co+0.3Cu.