Eccentric reducing pipe is a kind of pipe fitting used for reducing the diameter of pipe. Usually, the forming process is reducing pressing, expanding pressing or reducing plus expanding pressing. For reducing pipe of some specifications, stamping can also be used.

Apart from using steel pipe as raw material to produce eccentric reducing pipe, steel sheet can also be used to produce partial specification reducing pipe by stamping forming process. The shape of the die used for drawing is designed according to the surface size of the reduced-diameter tube. The die is used to press and draw the steel plate after blanking.