C: 0.07%-0.15% Si: 0.50% max Mn: 1.50% max P: 0.035% max S: 0.015% max Cr: 15.5%-17.5% Ni: 12.5%-14.5% Ti: 0.40%-0.70% W: 2.50%-3.00% B: 0.0015%-0.0060%