item name:cast steel flanges(pipe flange,fitting) Material: Carbon Steel:ASTM A105,20#Q23516Mn ASTM A350 LF1, ... LF2 CL1/CL2, LF3 item name: cast steel flanges(pipe flange,fitting)Seal Cover:FFRFMFMTGRJMaterial: Carbon Steel:ASTM A105,20#Q23516Mn ASTM ... -1997GB/T9123.1-2000GB/T9123.4-2000 cast steel flanges(pipe flange,fitting)