Specification size: DN15-1200 (NPS: 1/2-36 inches)
Wall thickness: 1-18mm (Sch5s to Sch80s)
Material: GR1/GR2/TA10/GR12
Executive standard: HG/T3651 ASME B16.9
Reducing pipe (large and small head) is a kind of pipe fitting used in the pipe reducing. The commonly used forming process is reduced-diameter pressing, expanded-diameter pressing or reduced-diameter plus expanded-diameter pressing, and certain specifications of different-diameter pipes can also be formed by stamping. The reducing-diameter forming process of the different-diameter tube is to put the tube blank equal to the large-end diameter of the different-diameter tube into the forming mold, and press the tube along the axial direction of the tube blank to move the metal along the mold cavity and shrink-mold it. According to the size of the reducer, it can be divided into one press forming or multiple press forming.
The diameter-expanding process mainly solves the situation that the reducer with a large diameter is not easy to be formed by reducing the diameter. Sometimes, according to the material and product forming needs, the methods of expanding and reducing the diameter are used together.
In the process of diameter reduction or diameter expansion deformation pressing, cold or hot pressing is determined according to different materials and diameter reducing conditions. Normally, cold pressing is used as much as possible, but hot pressing should be used for the case of severe work hardening caused by multiple diameter changes, thick wall thickness, or alloy steel materials. In addition to using steel pipes as raw materials to produce reducers, some of the reducers with different specifications can also be produced by stamping and forming processes using steel plates. The shape of the die used for stretching is designed with reference to the inner surface size of the reducer, and the steel plate after blanking is stamped and stretched with a die.
