254 SMO Super-Austenitic vs Alloy 330 High-Temperature Austenitic
Property comparison of 254 SMO Super-Austenitic and Alloy 330 High-Temperature Austenitic, both stainless steel.
| Property | 254 SMO Super-Austenitic | Alloy 330 High-Temperature Austenitic | Difference |
|---|---|---|---|
| Yield strength | 300 MPa | 172 MPa | -43% |
| Tensile strength | 650 MPa | 483 MPa | -26% |
| Elongation | 35 % | 30 % | -14% |
| Elastic modulus | 200,000 MPa | 196,000 MPa | -2% |
| Density | 8,000 kg/m³ | 8,080 kg/m³ | +1% |
| Thermal conductivity | 13 W/m·K | 12.5 W/m·K | -4% |
| Specific heat | 460 J/kg·K | 460 J/kg·K | 0% |
Difference is Alloy 330 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
- N08330
- standard
- AMS 5592 / ASTM B536
- 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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