254 SMO Super-Austenitic vs 310S High-Temperature Austenitic
Property comparison of 254 SMO Super-Austenitic and 310S High-Temperature Austenitic, both stainless steel.
| Property | 254 SMO Super-Austenitic | 310S High-Temperature Austenitic | Difference |
|---|---|---|---|
| Yield strength | 300 MPa | 245 MPa | -18% |
| Tensile strength | 650 MPa | 550 MPa | -15% |
| Elongation | 35 % | 45 % | +29% |
| Elastic modulus | 200,000 MPa | 196,000 MPa | -2% |
| Density | 8,000 kg/m³ | 7,890 kg/m³ | -1% |
| Brinell hardness | 250 HB | 217 HB | -13% |
| Thermal conductivity | 13 W/m·K | 10.8 W/m·K | -17% |
| Specific heat | 460 J/kg·K | 460 J/kg·K | 0% |
Difference is 310S High-Temperature Austenitic relative to 254 SMO Super-Austenitic. Values are taken from the representative row of each material; both materials may have multiple heat treatments or conditions on their individual pages.
Identification
- grade
- S31254
- standard
- ASTM A240
- heat treatment
- Annealed
- grade
- S31008
- standard
- ASTM A240
- heat treatment
- Annealed
About austenitic stainless steels
Austenitic stainless steels are the largest stainless family. They are non-magnetic in the annealed condition and gain corrosion resistance from chromium and nickel (and molybdenum in 316-class grades). They cannot be hardened by heat treatment and rely on cold work for higher strength. Includes the 300-series, super-austenitic grades (904L, AL-6XN), and high-nitrogen variants used in pressure vessels and chemical service.
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