Item name:SS blind flange(Steel flange,fitting) Seal Cover:FF,RF,MFM, ... :ASTM A105,20#Q23516Mn ASTM A350 LF1, L Item name:SS blind flange(Steel flange,fitting)Seal Cover:FFRFMFMTGRJMaterial: Carbon Steel ... ,ANSI B16.5HG20622-1997GB/T9123.1-2000GB/T9123.4-2000 SS blind flange(Steel flange,fitting)