X2CrMoTi17-1 or 1.4513
C: 0.025% max Si: 1.00% max Mn: 1.00% max P: 0.040% max S: 0.015% max Cr: 16.0%-18.0% Mo: 1.00%-1.50% Ti: 0.30%-0.60% N: 0.015% max