... ) 3.Pressure:class150,300,600,900,1500,2500,etc Plate Flange/Weld Neck FlangeDescription MaterialCarbon Steel:A105(N) C22.8 ... Welding Neck, Blind, Socket Welding, Threaded, Lap Joint and Plate etcConnectionButt Weld & Socket Weld & ThreadMarkingstandard or as customer’s ... to oil field and refinery as Steel Pipes, Pipe Fittings, Flange, Valves, Gasket, Petroleum Machinery, Fasteners, UV sterilizer, and ...