304H Austenitic Stainless Steel (UNS S30409) vs Alloy 904L Super-Austenitic
Property comparison of 304H Austenitic Stainless Steel (UNS S30409) and Alloy 904L Super-Austenitic, both stainless steel.
| Property | 304H Austenitic Stainless Steel (UNS S30409) | Alloy 904L Super-Austenitic | Difference |
|---|---|---|---|
| Yield strength | 206.8 MPa | 220 MPa | +6% |
| Tensile strength | 517.1 MPa | 490 MPa | -5% |
| Elongation | 40 % | 36 % | -10% |
| Elastic modulus | 199,955 MPa | 190,000 MPa | -5% |
| Coefficient of thermal expansion | 0.000017 1/K | 0.000015 1/K | -8% |
Difference is Alloy 904L Super-Austenitic relative to 304H Austenitic Stainless Steel (UNS S30409). 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
- 304H
- standard
- ASTM A240
- 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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