material: stainless steel,carbon steel ,alloy steel flange and dual phase steel Standard: JIS,ANSI,UNI,DIN,NF,ASME,API,JPI,AWWA ... ,thread flange,blind flange,socket welding flange2material:stainless steel,carbon steel ,alloy steel flange and dual phase steel3Standard: JIS,ANSI,UNI,DIN,NF,ASME ...