NAS335X is also an austenitic super alloy, mainly composed of nickel, iron and chromium, with additional copper and molybdenum elements added to resist corrosion in acidic environments. It also maintains good mechanical properties in high temperature environments up to 930°F (500°C).
In high temperature environments, NAS335X alloy steel can maintain high strength and hardness without softening or deformation, ensuring the reliability of equipment under long-term high-temperature working conditions. It has excellent oxidation resistance, which can effectively prevent oxidation reactions on the surface of metal materials and extend the service life of materials.
The Chemical Composition of NAS335X is as follows:
| Nickel (Ni) | 32.00–38.00 |
| Chromium (Cr) | 19.00–21.00 |
| Iron (Fe) | Bal. |
| Molybdenum (Mo) | 2.00–3.00 |
| Copper (Cu) Max. | 3.00–4.00 |
| Manganese (Mn) Max. | 2.00 |
| Niobium (Nb) plus Tantalum | 8xC–1.00 |
| Carbon (C) Max. | 0.07 |
| Silicon (Si) Max. | 1.00 |
| Sulphur (S) Max. | 0.035 |
| Phosphorous (P) Max. | 0.045 |
The mechanical property of NAS 335X is as follows:
| 0.2% proof stress (MPa) |
Tensile strength (MPa) |
Elongation (%) |
Hardness (HB) |
| R 241 | R 551 | R 30.0 |
Q 217 |
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