... of Origin: Henan China (Mainland)5.lots stock of carbon steel flangeNameCarbon Steel FlangeTypeWN flange,SO flange,T flange, ... customerDeliveryAccording ro the customerQuanlityFirst gradeCertificationISO9002,ISO9001,CE certification Our Carbon Steel Flange and Stainless Steel Flange be according to ... , BS, JIS, KS standards. the materials are ASTM A105, ST37, Q235, 20 Steel, S.S 304, 304L,316, 316L ...