API 6A blind flange working pressure: 2000~20000psi nominal bore:1 13/ ... SABS1123,EN1092,UNI,GOST12820-80Types: plate, slip on, welding neck, blind, thread, socket weld flangeProcess: free forging, plate cutting, heat ... the formal orderInspection: factory in-house self check or Third Party inspectionCarbon Steel:A105,SS400,SF440,RST37.2,S235,C22 ... F304,F304L,F316,F316L,316Ti and etc API 6A blind flange