1.Brand; Dong Shou 2.material: carbon steel 3.Standard: ASTM A 16.5, ASTM A16.47,ISO,DIN,GB,BS NAMERF FlangeSHAPEsocket weld flange, threaded flange, lap joint flange, ring joint flange Size 1/2"to 72" MaterialCarbon Steel, Stainless Steel, Alloy Steel Types of faceRF, FF, RJ, Tongue&Groove Facing, etc. CertificateAPI, ASME, and ISO9001: 2000 Applicationspetroleum, gas, chemical, metallurgy, ...