C: 0.05%-0.12% Si: 0.10%-0.80% Mn: 0.30%-1.30% P: 0.025% max S: 0.015% max Cr: 9.80%-11.20% Mo: 0.50%-1.00% Nb: 0.20%-0.50% Ni: 0.20%-1.20% N: 0.035% max Co: 5.00%-7.00% V: 0.10%-0.40% W: 0.70% max B: 0.005%-0.015%