... . Place of Origin: TPCO,Tianjin,Chengde,Cangzhou,Shangdong etc3. Material:1) CARBON STEEL: ASTM A106 GR. B & C/ ASTM A53 ... 2) ALLOY STEEL: ASTM A335 GR. P-1/P-2/P-5/P-9/P-11/ P-12/P-22/P-91/P-92/P-122.3) STAINLESS STEEL: ASTM A312 ... /310S/310H/317/317L/ 347/347H & ASTM A358 CL.1/2/3/4/5, GR.304/304L/304H/316/316L ... : X42, X46, X52, X56, X60, X65, X70, X80, PSL 1,2.High temp grade: A, B, C.Low temp grade ...