... steel 2,professional UT 3,all kind of types Forged Flange ring Specification 1,Standard: ASTM, BS,ASME, DIN, ... PN2.5-404,Type: Flat, Slip on, Blind, Welding Neck, Threaded, Lapped, Orifice, Figure 8 Blind, Swivel and etc ... and ISO180002,we can manufacture all kind of forged flange ring as per customer's requirement.3, inspection: ... Accepted 7, Professional engineers 8, Prompt Delivery forged flange ring