... :2008 carbon steel /alloy Flat Slip-on Bind /Toruseal Flange Varieties: threaded flange, slip-on flange (SO), socket welding flange, ... flange, welding neck collar, welding-on collar, loose plate flange, companion flange and so on. Facing method: rust preventing oil, ... cold galvanization or colored electroplate, powder coating and so on. Detailed information as follows:1.Standard:ANSI,ASTM,ASME,DIN ...