C: 0.080% max Si: 1.00% max Mn: 1.00%-2.00% P: 0.025% max S: 0.015% max Cr: 13.0%-16.0% Mo: 1.00%-1.50% Ni: 24.0%-27.0% B: 0.001%-0.010% Al: 0.35% max Ti: 1.90%-2.30% V: 0.10%-0.50%