High neck butt welded flange is a kind of flange, mainly because the higher neck has improved the stiffness and carrying capacity of the flange.

Its purpose is to transfer the pressure of the pipe, thereby reducing the high stress concentration butt welding flange in Franchi, also known as the high neck flange, the rigidity is large, suitable for high pressure and temperature occasions. The main production processes are integral forging, forging and casting, rolling and so on.