Stainless Steel Flange, Pipe Fittings, Valve manufacturer / supplier in China, offering GOST 12821-80 Standard Pn16 Welding Neck Flanges in 304/316, High-Quality SABS 1123 Stainless Steel Weld Neck Flange, High-Quality ANSI Sch20 Stainless Steel F304 Reducer Fitting and so on.