Steel Flange 1.Standard:DIN ANSI ASME JIS,etc 2.Size:1/2"(DN15) ... class150,300,600,900,1500,2500,etc Plate Flange/Weld Neck FlangeDescription MaterialCarbon Steel:A105(N) C22.8 ST-37.2 ... of Pipeline Materials to oil field and refinery as Steel Pipes, Pipe Fittings, Flange, Valves, Gasket, Petroleum Machinery, Fasteners, UV sterilizer, ... us, and create a bright future together. ASME B16.5 Steel Flange