... is designedto transfer stresses to the pipe, thereby reducing high stress concentrationsat the base of the Flange. ... Forging, Mould Forging, Upset Forging.Main Material:Carbon Steel,ASTM A 105, ASTM A 350 LF1, LF2 ... , 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 ...