ASTM A234 WP5 Concentric Reducer ASME B16.9 Alloy Steel Pipe Reducer

ASTM A234 WP5 concentric reducer is a high-temperature alloy steel butt weld pipe fitting manufactured according to ASME B16.9 standards. It is widely used in oil & gas, petrochemical, refinery, and power generation industries for connecting pipes of different diameters while maintaining a common centerline.

Astm A234  / A234M – 19 

Standard Specification for Piping Fittings of Wrought Carbon Steel and Alloy Steel for Moderate and High Temperature Service

WP5 alloy steel reducers offer excellent resistance to high temperature, pressure, oxidation, and corrosion, making them suitable for demanding industrial piping systems.

A234 WP5 butt weld Pipe fittings matches ASTM A335 chrome-moly Gr P5 pipes. and A182 F5 Flanges,A182 F5 Forged fittings

1.7362 12 CrMo 19 5

X11CrMo5

A 234 Grade WP5

We perform strict quality control,MT,UT,PMI will be conducted for the A234 WP5 Pipe fittings.

Check the ASTM A234 WP5 elbow butt weld fittings specification

What is ASTM A234 WP5 Concentric Reducer?

An ASTM A234 WP5 concentric reducer is a cone-shaped pipe fitting designed to reduce pipe diameter in a straight pipeline system. Both ends of the reducer share the same centerline, ensuring smooth flow transition and balanced fluid movement.

ASTM A234 WP5 is a chromium-molybdenum alloy steel material developed for elevated temperature service applications.

ASTM A234 WP5 elbow butt weld fitting specification

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ASME B16.9 Standard for Concentric Reducers

Our alloy steel concentric reducers are manufactured according to:

• ASME B16.9
• ASTM A234 WP5
• MSS SP-75
• ASME B16.25

All bevel ends are prepared according to ASME B16.25 requirements for butt welding installation.

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Chemical Composition of ASTM A234 WP5

Element	Content (%)
Chromium (Cr)	4.0 – 6.0
Molybdenum (Mo)	0.45 – 0.65
Carbon (C)	0.15 Max
Manganese (Mn)	0.30 – 0.60
Silicon (Si)	0.50 Max

The chromium and molybdenum content provide excellent heat resistance and corrosion resistance for high-temperature piping systems.

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Features of ASTM A234 WP5 Concentric Reducer

Excellent High Temperature Resistance

WP5 alloy steel reducers are suitable for elevated temperature service in refineries, boilers, and power plants.

Superior Corrosion Resistance

The chromium-molybdenum alloy improves resistance to oxidation and corrosion in harsh operating environments.

Smooth Flow Transition

Concentric reducers provide uniform flow and minimize turbulence in pipeline systems.

High Mechanical Strength

ASTM A234 WP5 fittings offer excellent strength under high-pressure conditions.

Long Service Life

The alloy steel composition ensures durability and reliable long-term performance.

Available Size Range

ASTM A234 WP5 BW Pipe fittings according to ASME B16.9 dimension

Size
1/2” to 48”

Wall Thickness:

• SCH10
• SCH20
• SCH40
• SCH80
• SCH160
• XXS

Custom sizes are available upon request.

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Types of Reducers Available

We can manufacture:

• Concentric Reducer
• Eccentric Reducer
• Seamless Reducer
• Welded Reducer

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Manufacturing Standards

Our ASTM A234 WP5 reducers comply with:

• ASTM A234
• ASME B16.9
• ASME B16.25
• NACE MR0175 (Optional)

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Surface Treatment

Available surface finishes include:

• Black Painting
• Anti-rust Oil
• Sand Blasting
• Varnish Coating

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Inspection and Testing

All reducers can be supplied with:

• Hydrostatic Test
• Ultrasonic Test (UT)
• PMI Inspection
• Dimensional Inspection
• Hardness Test
• Third-Party Inspection

EN 10204 3.1 Mill Test Certificate is available upon request.

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Applications of ASTM A234 WP5 Reducer

ASTM A234 WP5 concentric reducers are widely used in:

• Oil & Gas Pipelines
• Petrochemical Plants
• Refineries
• Thermal Power Stations
• Boiler Systems
• High Temperature Steam Pipelines
• Chemical Processing Plants

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ASTM A234 WP5 vs WP11

Grade	Main Alloy Element	Typical Application
WP5	5% Chromium	Moderate high-temperature service
WP11	1.25% Chromium	General elevated temperature piping

WP5 offers better oxidation and corrosion resistance at higher operating temperatures.

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Advantages of ASME B16.9 Concentric Reducer

Reduced Pressure Loss

The smooth transition design minimizes pressure drop and turbulence.

Improved Pipeline Stability

Concentric reducers maintain balanced flow in vertical piping systems.

Easy Welding Installation

Prepared bevel ends allow efficient butt weld installation.

Wide Industrial Compatibility

Suitable for carbon steel, alloy steel, and stainless steel piping systems.

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Packaging

Standard export seaworthy packing:

• Wooden cases
• Wooden pallets
• Fumigation-free packaging
• Customized packing available

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FAQ

What is the difference between concentric and eccentric reducers?

A concentric reducer maintains the same centerline, while an eccentric reducer has an offset centerline to avoid air accumulation or liquid pooling.

What is ASTM A234 WP5 material?

ASTM A234 WP5 is a chromium-molybdenum alloy steel used for high-temperature and high-pressure piping systems.

What standard covers concentric reducers?

ASME B16.9 is the standard for factory-made wrought butt welding fittings including concentric reducers.

Where are WP5 reducers used?

WP5 reducers are widely used in power plants, petrochemical industries, refineries, and boiler systems.

Are seamless reducers available?

Yes. We can supply both seamless and welded ASTM A234 WP5 concentric reducers according to customer requirements.

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How to Order ASTM A234 WP5 Concentric Reducer?

Example:

ASTM A234 WP5 Concentric Reducer
6” × 4”
SCH40
ASME B16.9
Bevel End
Seamless
Quantity: 50 PCS