... steel, cast steel, alloy steel, stainless steel, copper, aluminum, plastic, ppc, etc.. (2)According to production methods ,divided into ... Steel Pipe Flanges and Flanged Fittings >ANSI B16.47A/B <Large Diameter Steel Flanges> ,B16.36 etc.. a ... threaded flange b, welding flange, welding neck flange, welding neck flange, socket weld flange with neck , slipon plate flange c, Loose flange ...