... ALLOY STEEL pipes2. Place of Origin: JAPAN, ITALY, WEST EUROPE3. Material:1) CARBON STEEL: ASTM A106 GR. B & C/ ASTM ... etc.2) ALLOY STEEL: ASTM A335 GR. P-1/P-2/P-5/P-9/P-11/ P- ... /310H/317/317L/ 347/347H & ASTM A358 CL.1/2/3/4/5, GR.304/304L/304H/316/ ... , X46, X52, X56, X60, X65, X70, X80, PSL 1,2.High temp grade: A, B, C.Low temp grade ... : 1, 3, 4, 6, 7, 8, 9, 10, ...