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Raised face(RF) flanges Product specifications Materials of Industrial Flange Carbon steel:A105 Alloy steel:A192 F 1-F 2-F 5-F 9-F 10-F 91-F 92-F 122-F 911-F 11-F 12-F 21-F 22 A350 LF2 CL1 , A350 LF1 ...