... and Grades:GB5310, GB3087, 10#, 20#, 20G, 20MnG,12Cr1MoVG, 15CrMoG,ASTM A335(P1/P11/P12/P2/P22/P5/P9/P91)DIN17175 ... boilers and heat exchangersDimensions, Mechanical properties, Chemical compositions: Refer to ASTM A355, EN10216 or as per clients' requirements high-pressure boil pipes