Seamless Reducer

Seamless reducer is a key component used in industrial pipeline systems to connect pipes of different diameters. Its notable feature is the absence of welded joints, and it is manufactured through integral molding processes, providing higher structural integrity, pressure resistance, and leak resistance. It is widely used in high-pressure, high-temperature, corrosive, and other scenarios that require strict pipeline safety requirements. The following provides a detailed introduction from the aspects of manufacturing process, performance characteristics, classification, and application:

1、 Core Definition and Manufacturing Process

Seamless reducing pipe is a type of reducing pipe formed from seamless steel billets through cold or hot processing technology. It has no welding joints throughout the entire process, thus avoiding defects such as porosity, slag inclusion, and cracks that may exist in the weld seam. It can withstand higher pressure and more complex working conditions.

Main manufacturing process:

Cold extrusion molding

Process: The seamless steel pipe blank is extruded through a mold at room temperature, causing local deformation of the pipe and forming a conical transition structure with different diameters at both ends.

Advantages: High dimensional accuracy (tolerance ≤± 0.5mm), smooth surface (Ra ≤ 1.6 μ m), suitable for small and medium-sized diameter (DN15-DN200), thin-walled (wall thickness ≤ 10mm) reducing pipes.

Applicable materials: Low carbon steel, stainless steel (304, 316) and other materials with good plasticity.

Hot extrusion molding

Process: Heat the steel pipe blank to a high temperature (about 800-1200 ℃ for carbon steel and 1000-1250 ℃ for stainless steel), and use a hydraulic press to extrude and deform it through a mold to form a reducing structure.

Advantages: It can process thick walled (wall thickness 10-50mm) and large-diameter (DN200-DN600) reducers, with refined internal grain size and better mechanical properties (increased tensile strength by 10% -15%).

Applicable materials: high-strength alloy steel pipes (such as chromium molybdenum steel, low-temperature steel), thick walled stainless steel, etc.

Forging Forming

Process: Heating and forging the steel billet, forging it into a reduced diameter shape using a forging hammer or press, and then machining and adjusting the size.

Advantages: Suitable for large-diameter (DN600 or above) or high-pressure thick walled (such as Class 2500) reducers, with high material density and no internal defects.

Applicable scenarios: High pressure pipeline systems (such as oil and gas extraction, chemical reactor connections).