Stamping reducer (also known as concentric reducer or variable diameter pipe) is a type of pipe connector formed through stamping process, used to connect pipes of different diameters and achieve smooth transition of pipeline system. It is widely used in engineering systems such as petrochemical, power, HVAC, water supply and drainage.

1、 Product Features

One time stamping forming, high structural strength: using cold/hot stamping technology, continuous metal flow lines, no welds (seamless structure), excellent compressive and fatigue resistance, suitable for medium and high pressure working conditions.

Low fluid resistance and smooth transition: The concentric design ensures a conical smooth transition on the inner wall, avoiding the generation of eddies or turbulence during medium flow and reducing system pressure drop.

High dimensional accuracy: The mold molding ensures that the outer diameter, wall thickness, and length tolerances are controlled within ± 0.5mm, making it easy for on-site butt welding installation.

There are various connection methods: mainly butt welding connection, but can also be customized with socket welding, thread or double clamping structure, suitable for different pipes and construction conditions.

Space and cost savings: Compared to welded assemblies, single stamping reduces the number of connection points, lowers the risk of leakage, and reduces installation time.

Material diversity and adaptability support customization of various materials, including carbon steel (Q235, 20 #), alloy steel, austenitic stainless steel, duplex steel, titanium alloy, Hastelloy, Monel, Inconel, and special metal customization.

Stainless steel stamped fittings have excellent corrosion resistance and are widely used in industries such as chemical, food, and pharmaceutical; Carbon steel pipe fittings are economical and practical, and are the preferred choice for municipal engineering and ordinary industrial pipelines; Alloy steel pipe fittings can meet the requirements of special working conditions such as high temperature and high pressure.

2、 Execution standards

national standard:

GB/T 12459-2017 "Steel butt welded seamless fittings"

GB/T 13401-2017 "Welded Steel Pipe Fittings"

Industry standards:

SH/T 3408-2021 "Steel butt welded fittings for petrochemical industry"

HG/T 21634-2022 "Reducing Pipes for Chemical Pipelines"

International standards:

ASME B16.9 (American standard butt welded pipe fittings)

DIN 2616 (German standard reducer)

ISO 3419 (International General Specification for Welded Pipe Parts)

All products must undergo non-destructive testing (such as RT, UT) and hydrostatic testing (1.5 times working pressure) to ensure compliance with safety requirements.

3、 Size specifications

Note: The annotation method is "DN big end x small end", for example, DN100 x 80 represents big end DN100 and small end DN80; It can also be expressed in inches, such as 4 inches; 3 ";.

The bending length is usually 1.5D~2.0D (D is the diameter of the large end) to ensure a smooth transition of the fluid.

4、 Pressure level

Nominal pressure range: PN1.0MPa~PN420MPa (Sch5s~XXS)

Common level correspondences:

Sch40: Suitable for PN1.6~2.5MPa, conventional industrial and building systems

Sch80/XS: Suitable for PN4.0~10.0MPa, high-pressure steam and petroleum pipelines

XXS: Suitable for environments with PN above 10.0MPa or strong corrosion, such as nuclear power and deep-sea pipelines

Temperature resistance range:

Carbon steel: -20 ℃~+400 ℃

Stainless steel: -40 ℃~+600 ℃

Alloy steel: up to+650 ℃ (such as 15CrMo)

The actual selection should be based on the design pressure, temperature, and medium characteristics, and strength verification should be carried out according to ASME B31.3 or GB 50316 to ensure the safe operation of the system.