GRADE ASME/ ASTM A335 P5/ A213 T5 / Cr5Mo (STFA25 STPA25 STBA25) ASME/ ASTM A335 P12/ A213 T12 / 15CrMo (STFA22 STPA22 STBA22 T12 P12) ASME/ ASTM A335 P11/ A213 T11 / 1.25Cr0.5Mo (STFA23 STPA23 STBA23 T11 P11) ASME/ ASTM A335 P9/ A213 T9 / Cr9Mo (STFA26 STPA26 STBA26 T9 P9) 12Cr1MoV ASME/ ASTM A335 P22/ A213 T22 / 12Cr2Mo (10CrMo910 T22 P22) ASME/ ASTM A335 P921 A213 T91 / 10Cr9Mo1VNb T91 (P91) 12Cr2MoWVTiB (R102) WB36 (15NICUMOB5)