... design, service conditions, mechanical properties, and high-temperature characteristics.This specification covers seamless ferritic alloy ... -steel pipe for high-temperature service. The pipe shall be suitable ... strength, min, (MPa)415585620Yield strength, min, (MPa)205415440Elongation, min, (%), L/T30/2020/…20/… Heat TreatmentA / N+TN+T / Q+TN+T ASTM A572 High Strength ...