Item name:forged flange(steel flange,flat flange) Carbon Steel:ASTM A105,20# ... A350 LF1, LF2 CL1/CL2, LF3 CL1/CL2AS time name:forged flange(steel flange,flat flange)Carbon Steel:ASTM A105,20 ... ,ANSI B16.5HG20622-1997GB/T9123.1-2000GB/T9123.4-2000 forged flange(steel flange,flat flange)