... you quality,timely delivery; 3>Had been approved by ASTM. alloy seamless steel tube: Material: 12Cr1MoV, P22(10CrMo910), T91, P91, P9, ... 824mm*2-100mm, or according to the customers requirement Advantage: Super in corrosion resistance, high temperature resistance, low temperature resistance. ... to use the Official API Monogram.2> Boiler and Super-heater Pipes,Seamless Pressure Pipes had been approved by ...