... ,GB 3.Material: carbon steel (seam & seamless) ProductsPIPES,Elbow, Bend, Tee ,Reducers ,Flange ,Cap , Corrugated Expansion Joint, Metal hoseMaterialASTM:A234-WPB, WP1 ... , EN10253-2UsePetroleum, Chemical, Power, Gas, Metallurgy, Shipbuilding, Construction, etc WN stainless steel flange