... steel,carbon steel ,alloy steel flange and dual phase steel Standard: JIS,ANSI,UNI,DIN,NF,ASME,API,JPI, ... AWWA 1Type: welding neck flange,slip on flange,lap joint flange,thread flange,blind flange,socket ... welding flange2material:stainless steel,carbon steel ,alloy steel flange and dual phase steel3Standard: JIS,ANSI,UNI ...