ATI 304L Austenitic Stainless Steel (Low Carbon) vs ATI 309S Austenitic Stainless Steel (Low Carbon)
Property comparison of ATI 304L Austenitic Stainless Steel (Low Carbon) and ATI 309S Austenitic Stainless Steel (Low Carbon), both stainless steel.
| Property | ATI 304L Austenitic Stainless Steel (Low Carbon) | ATI 309S Austenitic Stainless Steel (Low Carbon) | Difference |
|---|---|---|---|
| Yield strength | 170 MPa | 351 MPa | +106% |
| Tensile strength | 485 MPa | 670 MPa | +38% |
| Elongation | 40 % | 44.6 % | +12% |
| Elastic modulus | 200,000 MPa | 200,000 MPa | 0% |
| Density | 7,900 kg/m³ | 8,030 kg/m³ | +2% |
| Thermal conductivity | 16.3 W/m·K | 15.6 W/m·K | -4% |
| Specific heat | 460 J/kg·K | 460 J/kg·K | 0% |
| Coefficient of thermal expansion | 0.000017 1/K | 0.000016 1/K | -6% |
Difference is ATI 309S Austenitic Stainless Steel (Low Carbon) relative to ATI 304L 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
- 304L
- standard
- ASTM A240
- heat treatment
- Annealed
- grade
- 309S
- standard
- ASTM A240; ASME SA-240
- 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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