
309S is the low-carbon version of 309, and is recommended for applications where sensitisation, and subsequent corrosion by high temperature gases or condensates during shutdown may pose a problem. 309 is manufactured to ASTM A 167 and 309S to ASTM A240 specifications.

| Element | Type309 |
| Carbon | 0.20 max. |
| Manganese | 2.00 max. |
| Sulfur | 0.030 max. |
| Phosphorus | 0.045 max. |
| Silicon | 0.75 max. |
| Chromium | 22.0 – 24.0 |
| Nickel | 12.0 – 15.0 |
Stainless Steel 309 is a highly alloyed austenitic steel used for its outstanding oxidation resistance, high-temperature strength and creep resistance. The lower nickel content of SS 309 Plates improves resistance to sulfur attack at high temperatures.

| STANDARD | UNS | WERKSTOFF NR. |
| SS 309 | S30900 | 1.4828 |
309 Stainless Steel Plates Chemical Composition :
| Grade | Fe | Cr | Ni | Mn | Si | C | P | S |
| SS 309 | 60% | 23% | 14% | 2% | 1% | 0.20% | 0.045% | 0.030% |
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