... ISO9001:2008,API ASTM B16.5 carbon steel flange1) ANSI/ASME B16.5 Steel flange,Blind flange,carbon steel flange2) Method:free forging,die ... Joint,Socket Weld,Threaded,5) Material: Carbon steel:A105,ST37.2,S235JR,Q235,P250GH Stainless steel:F304,F316,316L6) Marking: depends ... /ISO900110) Inspection:Internal/Third partyHigh quality is the key to win customers and keep long term cooperation relations.