253 MA, also known as Alloy 253 MA, 1.4835, or S30815, is a high-temperature, heat-resistant austenitic stainless steel. Its unique properties, including excellent strength and oxidation resistance at elevated temperatures, are primarily attributed to its specific chemical composition. This alloy is designed for applications requiring high performance under extreme heat.
The exact composition of 253 MA is carefully balanced to achieve its desirable characteristics. The key alloying elements and their typical percentage ranges are detailed below:
Chemical Composition of 253 MA
The following table outlines the standard chemical composition of 253 MA based on typical material specifications:
| Element | Percentage (%) |
|---|---|
| Carbon (C) | 0.05 – 0.12 |
| Silicon (Si) | 1.40 – 2.50 |
| Manganese (Mn) | ≤ 1.00 |
| Chromium (Cr) | 20.0 – 22.0 |
| Nickel (Ni) | 10.0 – 12.0 |
| Nitrogen (N) | 0.12 – 0.20 |
| Iron (Fe) | Balance |
Key roles of some alloying elements:
- Chromium (Cr): Provides excellent oxidation resistance at high temperatures and contributes to general corrosion resistance.
- Nickel (Ni): Stabilizes the austenitic structure and enhances ductility and toughness.
- Silicon (Si): Significantly improves oxidation resistance, especially in cyclic heating conditions.
- Nitrogen (N): Acts as a powerful austenite former, increases strength, and improves stability at elevated temperatures.
- Carbon (C): Contributes to high-temperature strength.
For detailed specifications and further technical data, you can refer to relevant datasheets, such as those provided by manufacturers like Metalcor: Datasheet
