... 300#--2500# 4: C/S ,S/S , Alloy Steel 5:Marking as Customer design. Carbon Steel Swivel Ring Flange Type Weld Neck,Slip- ... 300#,400#,600#,900#,1500#,2500# Specification Carbon Steel ASTM A105/A694 F42/46/52/60/A350 LF2 ... F5/F9/F11/F22/F91/Etc. Duplex stainless steel ASTM A182 F51/F53/F55/F60 Nicke alloys ... Incoloy 825/800 Cu-Ni 90/10,70/30Forged Steel Flanges:* ASME/ANSI B16.5 : WELDING NECK FLANGE, ...