Large-diameter flanges are used for butt welding of flanges and pipes. They are mainly used in welding technology. They have good use characteristics and performance. They have reasonable structure, high strength and rigidity, and can withstand high temperature and high pressure, repeated bending and temperature fluctuations. , The sealing performance is reliable, and the rolling flange with a nominal pressure of 0.25-2.5MPA adopts a concave-convex sealing surface. The main application environment of the rolled flange is suitable, and it needs to be determined according to the specific situation to ensure the specific use value and performance of the rolled flange and withstand high temperature and high pressure.