254 SMO® Alloy
UNS S31254
Description
254 SMO® alloy is a very high end, molybdenum and nitrogen alloyed super austenitic stainless steel with low carbon content, which has been developed for use in halide containing environments such as seawater. Because of its high molybdenum content, it has very high point corrosion resistance and crevice corrosion resistance. In addition, it also has a good uniform corrosion resistance. 254 SMO® alloy is substantially stronger than the common austenitic grades, with strength nearly twice that of 300 series stainless steel. It is also characterized by high ductility and impact strength.
Chemical Component
| C | Mn | Si | P | S | Cr | Ni | Mo | N | Cu |
|---|---|---|---|---|---|---|---|---|---|
| 0.020% max | 1.00% max | 0.080% max | 0.030% max | 0.010% max | 19.5-20.5% | 18.7-18.5% | 6.0-6.5% | 0.18-0.25% | 0.59-1.00% |
Basic Information
| Items | 254 SMO® Alloy |
|---|---|
| Catalog | ACMA-Fe-A046 |
| Density | 0.290 lb/in3, (8.0 g/cm3) |
| Modulus of Elasticity (E) | At 70 °F (20 °C): 28.3 x 103 ksi (195 GPa) |
| Modulus of Rigidity (G) | At 70 °F (20 °C): 10.9 x 103 ksi (75 GPa) |
| Coefficient of Expansion | 9.17 µin/in.-°F (86-200 °F); 16.5 µm/m-°C (30-100 °C) |
| Electrical Resistivity | 34 µohm-in, (86 µohm-cm) |
| Thermal Conductivity | 97.2 Btu-in/ft2hr-°F, (212 °F); 14.0 W/m-°C (100 °C) |
Material Forms
Alfa Chemistry offers 254 SMO® alloy in a variety of forms, including Strip, Foil.
Typical Mechanical Properties
- 254 SMO® alloy strip & foil
| Properties | Annealed |
|---|---|
| Heat Treatment | 2100-2192 °F (1150-1200 °C) |
| Tensile Strength | 100-120 ksi (690-830 MPa) |
| Suggested Operating Conditions | -320 °F to 1000 °F (-196 °C to 538 °C) |
Specifications
Strip& Foil: ASTM A240
Applications
- Industries: Chemical processing, food processing, oil & gas, power generation, pharmaceutical.
- Specifically: Desalination equipment, saltwater handling, flue gas desulfurization, food processing equipment, heat exchangers, pulp mill bleach systems, and oil distillation.
* Technical data included herein should be used as a guideline only, and should not be construed as maximum or minimum values for specification or for final design, or for a particular use or application. The data may be revised anytime without notice.
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