X19CrMoNbVN11-1 or 1.4913
C: 0.17%-0.23% Si: 0.50% max Mn: 0.40%-0.90% P: 0.025% max S: 0.015% max Cr: 10.0%-11.5% Mo: 0.50%-0.80% Ni: 0.20%-0.60% Alg: 0.020% max B: 0.0015% max N: 0.05%-0.10% Nb: 0.25%-0.55% V: 0.10%-0.30%