*****:Rst37.2, S235JRG2, C22.8, SS400, SF440A, A105, Q235 etc.2.Size:1/2"-40"3.Standard: ANSI;DIN;BS;UNI;JIS;SABS1000/3, etc.*****: :Welding plate flange, Slip-on flange, Welding neck flange, Threaded flange, Socket welding flange, Lap-joint flange , Blind Flange, 5.Surface...