What we call reducer joints is actually an adapter. This adapter is used to reduce pipes with relatively large outer diameters. Reducer joints are also used in MF, FF, and SF type devices. , which plays a slightly related role in reducing the concave head.
Classification of reducers
1. According to appearance and usage specifications, they are divided into two types: concentric reducing joints and eccentric reducing joints.
2. Classify according to material: stainless steel (304, 3041, 316, 3161), alloy steel, carbon steel (20#, Q235B, Q234, Q345), etc.
3. According to the connection form, there are welded reducing joints, internal wire reducing joints, external wire reducing joints, etc.
So, why are reducing pipe joints divided into Type A and Type B? What models are usually available on the market? Generally speaking, they are pipe fittings. Flanges, including pipes, are divided into Type A and Type B. One is imperial and the other is metric. What are the models on the market? Usually there are B series, that is, metric pipes, but most of the threaded pipe joints are imperial.
Introduction to eccentric reducer joints
It is a kind of pipe fitting used at the pipe diameter reduction part. The commonly used forming process is reducing diameter pressing, expanding diameter pressing or reducing diameter plus expanding diameter pressing. For certain specifications of reducing pipes, stamping can also be used. In addition to using steel pipes as raw materials to produce reducers, eccentric reducers of certain specifications can also be produced using steel plates using the stamping forming process. The shape of the punching die used for drawing is designed with reference to the inner surface dimensions of the reducer. The blanked steel plate is punched and stretched using a die. It is expressed as the diameter of the large head multiplied by the diameter of the small head multiplied by the thickness. The standards are national standard, American standard and British standard as well as various non-standard high-pressure stamping. The characteristics of the eccentric reducer are that its strength is significantly higher than that of carbon steel with the same carbon content, and it has good toughness and plasticity, as well as good weldability and corrosion resistance.
What is the difference between large and small heads and reducers?
Reducers are also called big and small heads. One of the chemical pipe fittings, used for connecting two different pipe diameters. It is further divided into concentric and eccentric heads. The reducer materials include stainless steel reducer (30430413163161), alloy steel, carbon steel reducer and reducer, No. 20 steel reducer q234g345, etc. The quality of reducer joints should comply with the current national standard "Steel Butt-Welded Reducer Fittings" GBT12459-2005. The roundness of the reducer should not be greater than 1% of the outer diameter of the corresponding end, and the allowable deviation is ±3mm. ;The allowable deviation of reducer size shall comply with the provisions of Table 4.2.2-3. Reducers comply with SV/T5037, GB/T9711, GB/T8163, American ASTM A106/A53 GRB, API 5L, APT5CT, ASTM A105, ASTM A234, ASTM A106, DIN German standards and customer requirements.
Production of seamless reducing pipe joints
Reducing pipe joint is a pipe fitting used at the pipe diameter reduction point. The commonly used forming processes are reducing diameter pressing, expanding diameter pressing or reducing diameter plus expanding diameter pressing. For certain specifications of reducers, stamping can also be used.
a. Diameter reduction/diameter expansion forming
The reduction forming process of the reducer is to put a tube blank with the same diameter as the large end of the reducer into the forming mold, and by pressing the tube blank along the axial direction, the metal moves along the mold cavity and shrinks to form. According to the size 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 punch to expand the diameter along the inner diameter of the tube blank. The diameter expansion process mainly solves the problem that the reducer with a larger diameter cannot be easily formed by diameter reduction. Sometimes, the diameter expansion and diameter reduction methods are combined according to the material and product forming needs.
During the deformation and pressing process of diameter reduction or expansion, cold pressing or hot pressing is determined according to different materials and diameter reduction conditions. Under normal circumstances, cold pressing is used as much as possible, but for situations where severe work hardening is caused by multiple diameter changes, where the wall thickness is too thick, or for alloy steel materials, hot pressing is always used.
b. Stamping forming
In addition to using steel pipes as raw materials to produce reducers, some specifications of reducers can also be produced using steel plates using the stamping forming process. The shape of the punch die used for drawing is designed with reference to the inner surface dimensions of the reducer, and the blanked steel plate is punched and stretched into shape using the die.
The above is a detailed introduction to the types of reducer joints and eccentric reducer joints. It also analyzes the differences between large and small heads. In addition, the manufacturing industry of seamless reducer joints is explained. I hope it will be useful to everyone. An understanding of reducer joints is helpful.
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