... pipes ,welded pipes(ERW/EFW/SSAW/LSAW)Material: Carbon steel : ASTM A53 A,B ASTME A 106A,B,C-API 5L ... ,9 API 5LX52,60,65,70 Stainless steel: ASTM A240 TP304,310,316,321 ASTM A 213,269,312,TP304,309,310,316 ... ,Alloy steel : ASTM A 335 P1,5,7,9,11,12,22,91 ...