... all kind of types Forged Flange ring Specification 1,Standard: ASTM, BS,ASME, DIN, SIS ,GB, JIS,ISO,JPI,EURONORM , we can ... Threaded, Lapped, Orifice, Figure 8 Blind, Swivel and etc, we can produce as per buyer's special requirements.5,Surface Treatment ... guarantee certificate : GB/T19001-2000, ISO14000 and ISO180002,we can manufacture all kind of forged flange ring as per customer's requirement ...