... ASME, GB, DIN, JIS 4.Material : A105... Steel Flange Type Weld Neck,Slip-On,Blind,Socket Weld,Lap ... Flange,Swivel Flange,Spectacle Blind,Etc. Size 1/2''-72''Class 150#,300#,400#,600#,900#,1500#,2500#,3000# Specification Carbon Steel ... ASTM A105/A694 F42/46/52/60/A350 LF2 Stainless Steel ASTM A182 F304 ... 30 days Country of Origin : Cangzhou , China Carbon steel flange