... 0.045≤0.0318.0-20.08.0-10.0---T*SY*SHardnessElongation(Mpa)(Mpa)HRBHB(%)≥520≥205-- --≥40Specifications of ... Blind flange7Sealing surface:FF ,RF, LJ, FM ,R.T.J ,R.J and so on .8Production process:raw material--cutting--heating--forging ... Blind, Socket Welding, Threaded, Lap Joint , Plate, etcFacingRF, FF, FM-M, T-G, RJ, etc.FinishTransparent oil, rust-proof oil, hot galvanizingConnectionButt ...