ASTM A815 UNS S32750 Pipe Cap | Super Duplex ASME B16.9 Pipe End Caps
What Is ASTM A815 UNS S32750 Pipe Cap?
ASTM A815 WPS UNS S32750 pipe caps are super duplex stainless steel butt weld pipe fittings manufactured according to ASME B16.9 dimensional standards.
These fittings are designed to seal the end of pipelines, preventing the flow of liquids or gases and providing reliable closure in high-pressure piping systems.
ASTM A815 S32750 pipe caps are widely used in offshore oil & gas pipelines, desalination plants, petrochemical processing systems, and marine engineering applications where excellent corrosion resistance and mechanical strength are required.
Material Grade – Super Duplex UNS S32750
UNS S32750, also known as Super Duplex Stainless Steel 2507, is a high-alloy duplex stainless steel combining the benefits of both austenitic and ferritic stainless steels.
Key advantages include:
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High mechanical strength
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Excellent resistance to pitting corrosion
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Superior resistance to crevice corrosion
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Excellent resistance to chloride stress corrosion cracking
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Outstanding performance in seawater environments
Because of these properties, ASTM A815 S32750 pipe end caps are commonly used in highly corrosive industrial environments.
ASTM A815 WPS S32750 Pipe Cap Specifications
| Item | Specification |
|---|---|
| Standard | ASTM A815 / ASME SA815 |
| Material Grade | UNS S32750 (Super Duplex 2507) |
| Product Type | Butt Weld Pipe Cap |
| Dimensional Standard | ASME B16.9 |
| Manufacturing Type | Seamless / Welded |
| Size Range | NPS 1/2″ – 48″ |
| Wall Thickness | SCH 10 – SCH XXS |
ASTM A815 covers wrought ferritic, ferritic-austenitic (duplex), and martensitic stainless steel pipe fittings for corrosion-resistant and high-temperature service.
Chemical Composition of UNS S32750
| Element | Content (%) |
|---|---|
| Chromium | 24 – 26 |
| Nickel | 6 – 8 |
| Molybdenum | 3 – 5 |
| Nitrogen | 0.24 – 0.32 |
| Carbon | ≤ 0.03 |
| Manganese | ≤ 1.2 |
The high Cr-Mo-N alloy content provides exceptional resistance to chloride-induced corrosion and localized corrosion.
Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | ≥ 800 MPa |
| Yield Strength | ≥ 550 MPa |
| Elongation | ≥ 15% |
Compared with standard austenitic stainless steels such as 304 or 316, super duplex pipe fittings provide nearly twice the mechanical strength.
Manufacturing Process of ASTM A815 Pipe Caps
ASTM A815 WPS S32750 pipe end caps are produced through controlled forming processes including:
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Plate cutting and preparation
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Hot forming or cold forming
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Solution annealing heat treatment
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Machining and beveling
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Dimensional and visual inspection
All fittings are manufactured according to ASME B16.9 tolerances and welding end preparation requirements.
Corrosion Resistance
UNS S32750 super duplex stainless steel provides excellent resistance to:
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Pitting corrosion
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Crevice corrosion
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Chloride stress corrosion cracking
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Seawater corrosion
Because of these characteristics, ASTM A815 S32750 pipe caps are widely used in marine and offshore pipeline systems.
Applications of ASTM A815 S32750 Pipe End Caps
Super duplex pipe caps are commonly used in:
Offshore Oil & Gas
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Subsea pipelines
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Offshore platforms
Desalination Plants
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Seawater pipelines
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Reverse osmosis systems
Petrochemical Industry
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Corrosion-resistant piping systems
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Chemical processing pipelines
Marine Engineering
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Seawater cooling systems
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Marine pipelines
Related Super Duplex Pipe Fittings
Other fittings manufactured from ASTM A815 UNS S32750 include:
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ASTM A815 S32750 Pipe Tees
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ASTM A815 S32750 Stub Ends
These fittings are typically used together to form complete corrosion-resistant piping systems
