F22 Flange

F22 flange is a heat-resistant ferritic alloy steel with basic alloy composition of 2.25% CR-1% MO. It is equivalent to the national standard 12CR2MO1 and the German standard 10CRMO910

F22 belongs to the American standard pearlescent heat strength steel forgings. The executive standard: ASTM A182/A182M-2018

F22 has good cold strain plasticity and machinability, and the weldability is acceptable. It is used to manufacture main pipes with steam parameters up to 510 ℃, superheated pipes with pipe wall temperatures up to 540 ℃, and various elastic elements working at high temperatures

When installing a pair of F22 flanges, the bolt holes on the equipment flange should be aligned with the corresponding bolt holes on the fixed flange and parallel to the fixed flange. In order to check and correct the direction of the flange from left to right, it is required to have a diameter deviation of 1.5 ‰ and 90 ° square or less with the outside of the flange. After passing points 3 and 4, spot weld to the next point. Complete the spot welding and fixing of the flange. When selecting the flange matching your equipment or valve assembly, please confirm that the flange of the original equipment or valve assembly is the same as the flange connection size used in your pipeline

Before installing the F22 flange, clean the flange surface, especially the seal surface. When installing the flat welding flange, insert the pipe end into 2/3 of the inner diameter of the flange, and spot weld the flange on the pipe. For horizontal pipe, spot weld the large diameter flange from above, and then use 90 ° angle ruler from different directions. Position the alignment flange so that the sealing surface is perpendicular to the centerline of the pipe and spot weld below the welding point

F22 flange clearance and surface treatment, use brush to remove floating rust on flange clearance and screws; Clean the flange clearance with compressed air; If chemical rust inhibitor is used, it will affect the flange sealing. When installing large diameter flanges, the above installation principles and requirements shall be followed