... :ASTM A 16.5 carbon steel Flange 2.Brand; Dong Shou 3.Material: carbon steel 4.Standard: ASTM A ... ASTM A16.47,ISO, nameASTM A 16.5 carbon steel Flangeshapesocket weld flange, threaded flange, lap joint ... joint flange Size1/2"to 72"MaterialCarbon Steel, Stainless Steel, Alloy Steel CertificateAPI, ASME, and ISO9001: 2000Surface treatmentblack ... shipbuilding, construction ASTM A 16.5 carbon steel Flange