C: 0.08%-0.15% Si: 0.50% max Mn: 0.40%-0.90% P: 0.025% max S: 0.015% max Cr: 11.0%-12.5% Mo: 1.50%-2.00% Ni: 2.00%-3.00% N: 0.020%-0.040% V: 0.25%-0.40%