... depend upon design, service conditions, mechanical properties, and high-temperature characteristics.This specification covers seamless ferritic alloy-steel ... Properties Grade P11, P22, P5, P9Grade P91Grade P92Tensile strength, min, (MPa)415585620Yield strength, min, (MPa)205415440Elongation, min, (%), L/T30 ... / N+TN+T / Q+TN+T ASTM A572 High Strength Low Alloy Columbium and Vanadium Structure Pipe