253 MA High-Temperature Austenitic vs Alloy 904L Super-Austenitic
Property comparison of 253 MA High-Temperature Austenitic and Alloy 904L Super-Austenitic, both stainless steel.
| Property | 253 MA High-Temperature Austenitic | Alloy 904L Super-Austenitic | Difference |
|---|---|---|---|
| Yield strength | 310 MPa | 220 MPa | -29% |
| Tensile strength | 650 MPa | 490 MPa | -25% |
| Elongation | 40 % | 36 % | -10% |
| Elastic modulus | 200,000 MPa | 190,000 MPa | -5% |
| Density | 7,800 kg/m³ | 7,950 kg/m³ | +2% |
| Thermal conductivity | 15 W/m·K | 12.9 W/m·K | -14% |
| Specific heat | 460 J/kg·K | 460 J/kg·K | 0% |
| Coefficient of thermal expansion | 0.000019 1/K | 0.000015 1/K | -20% |
Difference is Alloy 904L Super-Austenitic relative to 253 MA High-Temperature 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
- S30815
- standard
- ASTM A240 / EN 10028
- heat treatment
- Annealed
- grade
- N08904
- standard
- ASTM A240/B625
- 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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