... , F316L, F321, F321H, F347H, F317, A105, A350LF2, LF3,standard forged carbon steel flange 1)TUV and ISO 9001certificate 2)ANSI /DIN ... 9001 and certificated by PED fromGermany in 2000.We manifacture all kind of flanges,sucn as forged SO flange,bland flanges and ... weled neck flange and more as customer requirements. carbon alloy steel a 105n flange ...