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Reducer

Steel pipe reducers are butt-weld pipe fittings used to connect pipes of different diameters and provide a smooth transition between the larger and smaller pipe sizes. The two main types are concentric reducers, which maintain a common centerline, and eccentric reducers, which have offset centerlines and are commonly used where drainage, pump suction, or pipeline elevation needs to be controlled.

Central Steel supplies carbon steel and stainless steel reducers in a wide range of sizes, schedules, and material grades. Our reducers can be manufactured according to standards such as ASME B16.9, MSS SP-43, JIS B2312, and JIS B2313, depending on the material, size, and application.

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Steel Pipe Reducer Specifications

Item	Carbon Steel Reducer	Stainless Steel Reducer
Product Type	Concentric / Eccentric	Concentric / Eccentric
Size	NPS 1/2–48	NPS 1/2–48
Material Grades	ASTM A234 WPB, WPC ASTM A420 WPL6 (Low Temp) ASTM A860 WPHY 42, 52, 60, 65, 70 DIN/EN 1.0405 (P265GH), P235GH	ASTM A403 WP304, WP304L, WP316, WP316L, WP321, WP347 Duplex Steel: S31803 / S32205, S32750
Dimension Standard	ASME B16.9, JIS B2312, JIS B2313	ASME B16.9, MSS SP-43, JIS B2312, JIS B2313
Wall Thickness	SCH 5S–SCH 160, STD, XS, XXS	SCH 5S–SCH 160, STD, XS, XXS
Connection	Butt Weld	Butt Weld
Manufacturing	Hot Formed / Cold Formed	Hot Formed / Cold Formed
Customization	Available	Available

Types of Steel Pipe Reducers
Concentric reducer

A concentric reducer connects two pipes of different diameters while keeping their centerlines aligned. It is commonly used in vertical piping and applications where maintaining a symmetrical flow path is important.

Stainless Steel Concentric Reducer

Stainless Steel Concentric Reducer

Eccentric reducer

An eccentric reducer connects pipes of different diameters with an offset centerline. It is commonly used in horizontal piping, particularly where drainage, pump suction, or prevention of air accumulation is important.

Stainless Steel Eccentric Reducer

Carbon Steel Eccentric Reducer

Applications

Steel pipe reducers are commonly used in:

Oil and gas pipelines
Petrochemical and chemical processing
Power generation
Water treatment and distribution
Industrial process piping
Shipbuilding and offshore engineering
HVAC and chilled-water systems

How to Choose a Pipe Reducer?

The selection of a pipe reducer should consider the following factors:

Reducer type — Choose a concentric reducer when the pipe centerlines need to remain aligned; choose an eccentric reducer when an offset transition is required.
Pipe size — Specify the large-end and small-end NPS.
Material — Select carbon steel, stainless steel, or another alloy according to the fluid and operating conditions.
Wall thickness — Match the reducer schedule or wall thickness with the connected piping system.
Dimension standard — Confirm ASME B16.9, MSS SP-43, JIS, or another project-specific standard.
Service conditions — Consider pressure, temperature, corrosion resistance, and applicable piping codes.