API 6A blind flange working pressure: 2000~20000psi nominal bore:1 ... ,EN1092,UNI,GOST12820-80Types: plate, slip on, welding neck, blind, thread, socket weld flangeProcess: free forging, plate cutting, heat treat, machiningSurface ... ,C22.8Stainless Steel:F304,F304L,F316,F316L,316Ti and etc API 6A blind flange