... Flanges:The threaded flange is similar to the slip-on flange, but the bore is threaded. Itschief merit ... Forging, Mould Forging, Upset Forging.Main Material:Carbon Steel,ASTM A 105, ASTM A 350 LF1, LF2 ... 347, 347H, 347LN, 348, 348H, 904, 904L etc.Alloy Steel,ASTM A182 F1, F5a, F9, F11, F12, F22, ... DIN 1.4462 SAF2205 SA182 F51Super duplex stainless steel,Super duplex 2507 UNS S32750 F53 ASTM A182 ...