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Reducing pipes, also known as reducers, are one of the pipeline fittings used in fluid pipeline construction for connecting two different pipe diameters. They can be divided into RC concentric reducers and RE eccentric reducers according to their shapes. Reducing pipe/reducer is a type of pipe fitting used for pipe diameter changes. The commonly used forming processes include reducing diameter pressing, expanding diameter pressing, or reducing diameter plus expanding diameter pressing. For some small-sized reducing pipes, stamping forming can also be used

Reducing pipes can be divided into carbon steel according to their manufacturing materials: (20 #, A3, Q235, Q23 excellent, Q235B, 20G, 16Mn, Q345, Q345R, ASTM A234WPB, ASTM A105, etc.); Stainless steel: (304, 304L, 316, 316L, S30408, S30403, S31608, S31603, SUS304, ASTM A403, TP321, TP317L, 347, 0Cr18Ni9, 00Cr19Ni10, 00Cr17Ni14Mo2, 1Cr18Ni9Ti, 06Cr17Ni12Mo2, 022Cr17Ni12Mo2, etc.); Alloy steel: (16MnR, Cr5Mo, 12Cr1MoV, 10CrMo910, 15CrMo, 12Cr2Mo1, A335P22, St45.8/III, A10bB, etc.); Special alloy steel: (TP310S, 904L, Incoloy800, Incoloy825, Incoloy600, Incoloy625, etc.); Dual phase stainless steel: (F51, S31803, S2205, F53, 2507, S32750, F55, 2607, S32760, etc.)

Common execution standards for reducers/reducers:

Standards: GB/T12459-2017, GB/T13401-2017

American standard: ASME B16.9

Petrochemical standards: SH/T3408-2012, SH/T3409-1996

Ministry of Chemical Industry standards: HG/T21635-1987

Power industry standards: DL/T695-2014

Petroleum and gas industry standards: SY/T0510-2017

Application of concentric reducers: When the flow rate of the fluid in the pipeline changes, such as increasing or decreasing, and the flow rate requirement does not change much, it is necessary to use reducing tube; To prevent cavitation during pump procurement, it is necessary to use a reducing pipe; In order to match with the joints of instruments such as flow meters and regulating valves, reducing pipes are also required. At present, most pipe networks require the use of reducers, mainly used in petroleum, chemical, gas, steam pipe networks, hydraulic machinery, etc