309 is an austenitic heat resistant alloy with oxidation resistance to 1900°F under constant temperature conditions. When frequent thermal cycling is involved, the alloy is resistant to about 1850°F. The high chromium and relatively low nickel content of 309 provide good resistance to high temperature sulfur bearing atmospheres. 309 has only moderate resistance to carbon absorption and is not suggested for use in highly carburizing atmospheres.
The chemical composition of grade 309/309s Stainless Steel is outlined in the following table
| Element | 309 |
|---|---|
| Chromium | 22.0 min.-24.0 max. |
| Nickel | 12.0 min.-15.0 max. |
| Carbon | 0.20 |
| Manganese | 2.00 |
| Phosphorus | 0.045 |
| Sulfer | 0.030 |
| Silicon | 0.75 |
| Iron | Balance |
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