X1CrNiMoN25-22-2 or 1.4466
C: 0.020% max Si: 0.70% max Mn: 2.00% max P: 0.025% max S: 0.010% max Cr: 24.0%-26.0% Mo: 2.00%-2.50% Ni: 21.0%-23.0% N: 0.10%-0.16%