ASTM A815 UNS 32750 Buttweld Fittings
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ASTM A815 UNS S32750 is a specification for wrought austenitic, ferritic, duplex steel butt-welded fittings. These fittings are designed for use in high-pressure, high-temperature, and corrosive environments, making them suitable for a wide range of industries, including oil and gas, chemical processing, petrochemical, and more. The term "UNS S32750" refers to a specific grade of duplex stainless steels, also known as Super Duplex Stainless Steels. Duplex stainless steels are characterized by their mixed microstructure of austenite and ferrite phases, which gives them enhanced mechanical properties and corrosion resistance compared to traditional austenitic stainless steels.
ASTM A815 S32750 Super Duplex Steels Pipe Fittings Equivalent Grades
| STANDARD | WERKSTOFF NR. | UNS |
| Super Duplex 2507 | 1.4410 | S32750 |
Super Duplex S32750 ASTM A815 Butt weld Fittings Chemical Composition
| C | Mn | Si | P | S | Cr | Mo | Ni | N | Fe |
| 0.030 max | 1.20 max | 0.80 max | 0.035 max | 0.020 max | 24.00 – 26.00 | 3.00 – 5.00 | 6.00 – 8.00 | 0.24 – 0.32 | 58.095 min |
Ferritic/Austenitic Super Duplex Steels Butt weld Pipe Fittings Mechanical Properties
| Density | Melting Point | Tensile Strength | Yield Strength (0.2%Offset) | Elongation |
| 7.8 g/cm3 | 1350 °C (2460 °F) | Psi – 116000 , MPa – 800 | Psi – 80000 , MPa – 550 | 15 % |
Key features and advantages of ASTM A815 UNS S32750 buttweld fittings include:
Corrosion Resistance: UNS S32750 duplex stainless steels offers excellent resistance to corrosion, especially in aggressive environments containing chloride and sulfide ions.
High Strength: Duplex stainless steels like UNS S32750 exhibit higher tensile and yield strength compared to conventional austenitic stainless steels, allowing for thinner walls and lighter components.
Good Weldability: ASTM A815 UNS S32750 can be easily welded using standard welding techniques, ensuring ease of fabrication and installation.
Versatility: These fittings are suitable for a wide range of applications, from offshore platforms and seawater systems to chemical processing and desalination plants.
Pressure and Temperature Resistance: The duplex stainless steels construction of these fittings provides robust performance in high-pressure and high-temperature environments.
Longevity: Thanks to their corrosion resistance and mechanical properties, ASTM A815 UNS S32750 buttweld fittings can offer a longer service life compared to other materials.
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