... .Standard:ANSI,ASTM,MSS,JIS,DIN,EN HY carbon steel Welding Neck Flange We started to product flanges from 1986.With ... ,GB etc.2. TypeSlip On Flange, Flat Face Flange, Socket Welding Flange, Blind Flange, Non-standard flange ect.3. Size1/2 ... --heating--forging--heat treatment--maching--inspection.7. Inspectionfactory in-house self check or Third Party inspection8. Packingwooden pallets,cases or depends ...