... ., The main executive standards include for carbon steel: ASTM A106 A179A192A199A210A213DIN2391DIN17175 etc. and for stainless steel: ASTM A213/A312 TP304,304L,316 ... ,316L,321,304,304H etc.and Alloy steel :A335.A213. The products are exported to Korea, India, Southeast ... long-term business relationship for our mutual benefit and developing ERW Steel Pipe