Long neck flange features:
(1)stainless steel flange and carbon steel flange
(2)standard: ASME, ANSI, API, JIS, JPI, DIN, UNI, BS, AS
(3)material: 316L, 316Ti, 304L, 321, 321H, Rst37.2, C22.8
(4)production with anneal solution for stainless performance
(5)special design avaliable