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254 SMO Stainless Steel (UNS S31254) is a high-end, super-austenitic stainless steel characterized by excellent corrosion resistance, particularly in chloride-rich environments. With high levels of molybdenum and nitrogen, it exhibits outstanding resistance to pitting, crevice corrosion, and stress-corrosion cracking, making it ideal for applications exposed to seawater, brackish water, and harsh chemical environments. Notably, 254 SMO outperforms conventional austenitic grades and can be a cost-effective substitute for high-nickel and titanium alloys.
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| Element | Composition (%) |
|---|---|
| Carbon (C) | ≤ 0.02 |
| Silicon (Si) | ≤ 0.70 |
| Manganese (Mn) | ≤ 1.0 |
| Phosphorus (P) | ≤ 0.03 |
| Sulfur (S) | ≤ 0.01 |
| Chromium (Cr) | 19.5 – 20.5 |
| Nickel (Ni) | 17.5 – 18.5 |
| Molybdenum (Mo) | 6.0 – 6.5 |
| Copper (Cu) | 0.5 – 1.0 |
| Nitrogen (N) | 0.18 – 0.25 |
| Iron (Fe) | Balance |
| Property | Metric | Imperial |
|---|---|---|
| Density | 8.0 g/cm³ | 0.289 lb/in³ |
| Modulus of Elasticity | 195 GPa | 28,300 ksi |
| Thermal Conductivity | 13 W/m·K | 97.2 BTU·in/hr·ft²·°F |
| Coefficient of Thermal Expansion | 16.5 µm/m·°C | 9.17 µin/in·°F |
| Specific Heat (20°C) | 500 J/kg·K | 0.12 BTU/lb·°F |
| Electrical Resistivity | 0.85 µΩ·m | 33.5 µΩ·in |
| Property | Value (Metric) | Value (Imperial) |
|---|---|---|
| Yield Strength (0.2% Offset) | 300 MPa | 43,500 psi |
| Ultimate Tensile Strength | 650 – 850 MPa | 94,300 – 123,200 psi |
| Elongation at Break | 35% | – |
| Hardness (Brinell) | ≤ 210 | – |
| Property | Metric | Imperial |
|---|---|---|
| Thermal Conductivity | 13 W/m·K | 97.2 BTU·in/hr·ft²·°F |
| Mean Coefficient of Thermal Expansion | 16.5 µm/m·°C | 9.17 µin/in·°F |
| Melting Range | 1350 – 1450°C | 2462 – 2642°F |
| Property | Value |
|---|---|
| Electrical Resistivity | 0.85 µΩ·m |
| Product Type | Standards | Sizes | Types | Applications |
|---|---|---|---|---|
| Sheets & Plates | ASTM A240 | Thickness: 3mm – 100mm | Hot Rolled, Cold Rolled | Marine, oil & gas, chemical processing |
| Pipes & Tubes | ASTM A312, A213 | Diameter: 6mm – 500mm | Seamless, Welded | Saltwater systems, condensers, heat exchangers |
| Bars | ASTM A276 | Diameter: 6mm – 200mm | Round, Square, Hex | High-stress structural components |
| Angles, Channels, Beams | ASTM A479 | Custom sizes available | L-Angles, U-Channels | Offshore oil rigs, marine platforms |
| Fittings | ASTM A182, B366 | Size: 1/2″ – 36″ | Buttweld, Socket Weld | Corrosive environment connections |
254 SMO is well-suited for challenging industrial environments where resistance to seawater, brackish water, and high-chloride solutions is essential:
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