... :317L,316L,304H/L,321,310S,347H, ansi b16.5 class 150 weld neck flange1.specificationStandards: ANSI(ASME), AWWA, DIN, EN1092 ... ,A182 F304/F304L,F316/F316L 7 AWWA C207 4"--144" Class B,D,E,F T/1 PL A105,A181 A36 ... .4404 1.4541 1.4571/DIN174402.picture ansi b16.5 class 150 weld neck flange