Products Description
ASTM A312 Uns S31254 Super Duplex 2507 Stainless Steel Pipe
Advantages of ASTM A312 Uns S31254 Super Duplex 2507 Stainless Steel Pipe
- Strong Corrosion Resistance: S31254 and 2507 offer excellent corrosion resistance. S31254 is suitable for acidic, chloride-rich, or seawater environments; 2507 is suitable for high-chloride and high-pressure environments.
- Good Weldability: S31254 and 2507 offer excellent weldability. However, S31254 requires care to avoid hot cracking due to its high alloy content; 2507 requires post-weld heat treatment to maintain duplex phase equilibrium.
applications of UNS S31254 (254 SMO) Stainless Steel Pipe
- Seawater Systems: Piping, pumps, and valves in ship cooling, aquaculture, and ballast systems.
- Desalination Plants: Reverse Osmosis (RO) piping, evaporators, and brine discharge lines.
- Chemical Processing: Transport and storage of acids such as sulfuric acid, nitric acid, and phosphoric acid.
- Food and Beverage: Sanitary process piping with stringent corrosion resistance and hygiene requirements.
Applications of Super Duplex 2507 (UNS S32750) Stainless Steel Pipe
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Oil and Gas: Subsea pipelines, risers, separators, manifolds, and injection lines.
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Offshore Platforms: Process piping, fire protection systems, and seawater cooling circuits.
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Chemical Processing: Reactors, columns, and high-pressure piping exposed to acids and chlorides.
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Desalination Plants: High-pressure RO modules and brine circulation lines.
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Power Generation: Heat exchangers, boiler feedwater, and condenser piping.
Chemical Composition
| Element | Chromium | Nickel | Molybdenum | Nitrogen | Carbon | Manganese | Silicon | Phosphorus | Sulfur | Iron |
| UNS S31254 | 19.5 – 20.5 | 17.5 – 18.5 | 6.0 – 6.5 | 0.18 – 0.22 | ≤ 0.020 | ≤ 1.0 | ≤ 0.8 | ≤ 0.030 | ≤ 0.010 | Balance |
| UNS S32750 | 24.0 – 26.0 | 6.0 – 8.0 | 3.0 – 5.0 | 0.24 – 0.32 | ≤ 0.030 | ≤ 1.2 | ≤ 0.8 | ≤ 0.035 | ≤ 0.020 | Balance |
Mechanical Properties
| Property | Tensile Strength | Yield Strength | Elongation | Hardness | Density | Modulus of Elasticity | Impact Resistance |
| UNS S31254 | ≥ 650 MPa | ≥ 300 MPa | ≥ 35% | ≤ 220 HBW | 8.0 g/cm³ | ~195 GPa | Excellent |
| UNS S32750 | ≥ 795 MPa | ≥ 550 MPa | ≥ 15% | ≤ 310 HBW | 7.8 g/cm³ | ~200 GPa | Excellent(at -50°C) |
Possible Alternative Grades
- UNS S32205 / S31803 (Duplex Stainless Steel): These offer good corrosion resistance and high strength but are more affordable than S32750. Suitable for moderately aggressive environments, especially when budget is a concern.
- Alloy 625 (Nickel Alloy): Known for extreme corrosion and heat resistance, particularly against acidic and high-temperature media. It's a premium option, often used in chemical and aerospace applications.
- UNS N08926 (6Mo Alloy / Alloy 1925 hMo): Similar in corrosion resistance to S31254, offering excellent pitting and crevice resistance, often used interchangeably in seawater applications.
- 316L or 317L Stainless Steel: Lower-cost austenitic grades suitable for general-purpose corrosion resistance. Not suitable for high-chloride or high-pressure environments.
- Titanium Grade 2 or 5: Highly corrosion-resistant and lightweight materials ideal for desalination, marine, or aerospace applications where seawater and extreme environments are involved.
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