... for low and medium pressure boiler working at a temperature below450°C ,Tubes , economizer, superheater and reheater, petrochemical ... line pipe etc. used for high pressure boiler working temperature between 450°C ~ 650 °C ... ,12Cr1MoVG,12Cr2MoWVTiB,10Cr9Mo1VNbetc.ASTM: Grade A,C,D, Grade A-1,C,BS: 320 CFS, 440,243 ...