X20CrMoV11-1 or 1.4922
C: 0.17%-0.23% Si: 0.40% max Mn: 0.30%-1.00% P: 0.025% max S: 0.015% max Cr: 10.0%-12.5% Mo: 0.80%-1.20% Ni: 0.30%-0.80% V: 0.20%-0.35%
C: 0.17%-0.23% Si: 0.15%-0.50% Mn: 1.00% max P: 0.025% max S: 0.020% max Cr: 10.0%-12.5% Mo: 0.80%-1.20% Ni: 0.30%-0.80% V: 0.25%-0.35% Al: 0.040% max Cu: 0.30% max