ATI 309S Austenitic Stainless Steel (Low Carbon) vs ATI 31 (Superaustenitic)
Property comparison of ATI 309S Austenitic Stainless Steel (Low Carbon) and ATI 31 (Superaustenitic), both stainless steel.
| Property | ATI 309S Austenitic Stainless Steel (Low Carbon) | ATI 31 (Superaustenitic) | Difference |
|---|---|---|---|
| Yield strength | 351 MPa | 276 MPa | -21% |
| Tensile strength | 670 MPa | 650 MPa | -3% |
| Elongation | 44.6 % | 40 % | -10% |
| Elastic modulus | 200,000 MPa | 198,000 MPa | -1% |
| Density | 8,030 kg/m³ | 8,060 kg/m³ | 0% |
Difference is ATI 31 (Superaustenitic) relative to ATI 309S Austenitic Stainless Steel (Low Carbon). 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
- 309S
- standard
- ASTM A240; ASME SA-240
- heat treatment
- Annealed
- grade
- UNS N08031
- standard
- ASTM B625; EN 1.4562
- heat treatment
- Solution 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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