Tubesheet flange is an accessory with the same outer diameter as the pipe drilled in the steel plate, and the pipe is welded and fixed. Tubesheets flange are widely used in tube heat exchangers, boilers, pressure vessels, steam turbines and other industries. Tubesheets are mainly used for chemical vessels, tubular heat exchangers, pressure vessels, boilers, condensers, and central air conditioners, and play the role of supporting and fixing the tubes. The metal material has not only strong rigidity, but also great heat transfer performance.