ASTM A815 WPS UNS S32750 Concentric Reducer
Super Duplex 2507 Butt Weld Reducer | ASME B16.9
Product Overview
ASTM A815 WPS UNS S32750 concentric reducers are super duplex stainless steel butt-weld fittings used to connect pipes of different diameters on the same centerline.
Manufactured in accordance with ASME B16.9, these reducers ensure a smooth flow transition, reduced turbulence, and excellent mechanical integrity in high-pressure and highly corrosive environments.
Made from Super Duplex Stainless Steel UNS S32750 (2507), these concentric reducers are widely used in offshore oil & gas, subsea systems, seawater pipelines, chemical processing, and desalination plants.
What Is ASTM A815 WPS UNS S32750?
ASTM A815 is the standard specification covering wrought ferritic, ferritic/austenitic (duplex), and martensitic stainless steel pipe fittings for pressure service.
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WPS indicates wrought pipe fittings
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UNS S32750 is a super duplex stainless steel (2507) grade with very high strength and exceptional corrosion resistance
ASTM A815 UNS S32750 fittings are selected when standard duplex (S31803 / S32205) is not sufficient for corrosion or pressure requirements.
Concentric Reducer Design
A concentric reducer features a symmetrical cone shape with both ends sharing the same centerline.
Equivalent Grades
| Standard | Grade |
|---|---|
| ASTM | A815 WPS |
| UNS | S32750 |
| ASTM Flange Equivalent | A182 F53 |
| EN | 1.4410 |
| EN Name | X2CrNiMoN25-7-4 |
Corrosion Resistance & PREN
UNS S32750 provides a PREN value ≥ 42, delivering outstanding resistance to:
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Pitting corrosion
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Crevice corrosion
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Stress corrosion cracking (SCC)
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Seawater and chloride-rich environments
This makes ASTM A815 S32750 concentric reducers ideal for marine, offshore, and subsea applications.
Dimensions & Standards
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Material Standard: ASTM A815 WPS UNS S32750
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Fitting Standard: ASME B16.9
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Type: Concentric Reducer
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Size Range: 1/2″ × 1/4″ up to 48″ × 36″
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Wall Thickness: SCH 10, 20, 40, STD, XS, XXS
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Manufacturing: Seamless / Welded
Heat Treatment & Manufacturing
Super duplex S32750 concentric reducers are typically supplied in the solution annealed and quenched condition, ensuring:
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Correct ferrite-austenite balance
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Maximum corrosion resistance
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Consistent mechanical performance
Inspection & Quality Control
ASTM A815 WPS UNS S32750 reducers are supplied with strict inspection and testing, including:
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Chemical composition analysis
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Mechanical property testing
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Ferrite content control
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PMI (Positive Material Identification)
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Dimensional inspection
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Visual examination
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Certification: EN 10204 3.1 / 3.2
ASTM A815 WPS UNS S32750 concentric reducers manufactured to ASME B16.9 provide a superior solution for diameter transitions in critical piping systems.
Related Products
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ASTM A815 UNS S32750 Tee
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ASTM A182 F53 / F55 Super Duplex Flanges
