Application of reducer (small head) in process pipeline

The reducer, also known as the reducer, is one of the commonly used pipe fittings in chemical power plants and other projects. It is used for the connection of two different pipe diameters and is divided into concentric reducers and eccentric reducers. National standard American standard and various non-standard high-pressure stamping pipe fittings. Commonly used implementation standards are: "Steel plate butt welded pipe fittings" GB/T13401-2005 stipulated reducing pipe standards. Butt welding seamless pipe fittings" GB/T 12459-2005, Ministry of Electric Power GD0506~0507.

       The reducing forming process of the reducing tube is to put a tube blank with the same diameter as the large end of the reducing tube into a forming die, and press the tube along the axial direction of the tube blank to move the metal along the mold cavity and shrink into shape. According to the size of the reducing diameter of the reducer, it is divided into one-time press forming or multiple press forming.

Diameter expansion forming is to use a tube blank smaller than the diameter of the large end of the reducer, and use an inner die to expand the diameter along the inner diameter of the tube blank. Diameter expansion technology mainly solves the problem that the diameter-reducing reducer is not easy to be formed by reducing diameter. Sometimes according to the material and product forming needs, the method of expanding diameter and reducing diameter is combined.

In the process of reduction or expansion deformation, cold pressing or hot pressing is determined according to different materials and diameter changes. Under normal circumstances, cold pressing should be used as much as possible, but hot pressing should be used for severe work hardening caused by multiple diameter changes, thicker walls or alloy steel materials.