Corrosion Resistant 254SMO Stainless Steel Pipe with High Molybdenum Content for Seawater Applications
254SMO Stainless Steel Pipe Tube UNS S31254 is a super-austenitic stainless steel designed for maximum resistance to pitting and crevice corrosion. With high levels of chromium, molybdenum, and nitrogen, this alloy is especially suited for high chloride environments including brackish water, seawater, pulp mill bleach plants, and other high chloride process streams.
254SMO pipes offer superior chloride resistance compared to Alloy 904L, Alloy 20, Alloy 825, and Alloy G. The copper content improves corrosion resistance in certain acids, while the high nickel, chromium, and molybdenum content provides excellent stress corrosion cracking performance.
- Superior resistance to pitting and crevice corrosion
- Excellent performance in high chloride environments
- Enhanced stress corrosion cracking resistance
- Substantially stronger than common austenitic grades
- High ductility and impact strength
- Excellent fabricability and weldability
- Cost-effective alternative to nickel-based alloys and titanium
| Element | Min (%) | Max (%) |
|---|---|---|
| Nickel (Ni) | 17.5 | 18.5 |
| Chromium (Cr) | 19.5 | 20.5 |
| Molybdenum (Mo) | 6.0 | 6.5 |
| Copper (Cu) | 0.50 | 1.00 |
| Nitrogen (N) | 0.18 | 0.22 |
| Carbon (C) | - | 0.020 |
| Manganese (Mn) | - | 1.00 |
| Silicon (Si) | - | 0.80 |
| Phosphorus (P) | - | 0.03 |
| Sulfur (S) | - | 0.010 |
- Petroleum and petrochemical equipment including bellows
- Pulp and paper bleaching equipment
- Power plant flue gas desulphurization systems
- Seawater processing systems and condensers
- Desalination industry equipment
- Heat exchangers in chloride environments
- Hydraulic and instrumentation tubing
- Chemical tanks and pipelines with high halide contents
254SMO features a face-centered cubic lattice structure and is typically annealed at 1150-1200°C to obtain austenitic structure. The material maintains excellent impact strength and corrosion resistance under normal operating conditions.
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