Alloy 690
2.4642 – N06690
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Material description
The material 2.4642 is a nickel-chromium alloy.
The alloy has excellent resistance to high-temperature and moisture corrosion as well as good resistance to oxidising media. In addition, 2.4642 (Alloy 690) has high strength and good metallurgical stability. These properties make the material very easy to machine.
AN OVERVIEW OF THE PROPERTIES OF 2.4642:
- Resistant to high-temperature and moisture corrosion
- Resistance to oxidising media
- High strength
- Good metallurgical stability
Applications
- Power plant technology
- Coal gasification
- Saltpetre, sulphuric and hydrochloric acid processing
Chemical composition in %
| ASTM B166/564 | DIN 17742 | |
|---|---|---|
| Ni | min. 58,0 | Rest |
| Cr | 27,0 – 31,0 | 27,0 – 31,0 |
| Fe | 7,0 – 11,0 | 7,0 – 11,0 |
| Mn, max. | 0,5 | 0,50 |
| C, max. | 0,05 | 0,05 |
| Cu, max. | 0,5 | 0,50 |
| Si, max. | 0,5 | 0,50 |
| S, max. | 0,015 | 0,015 |
| P, max. | 0,020 | |
| Al, max. | 0,50 | |
| Ti, max. | 0,50 |
Mechanical properties
| solution annealed | Bar | forging ASTM B166 | ASTM B564 | Bar D ≤ 100 mm DIN 17752 |
|---|---|---|
| Rm (MPa) | ≥ 586 | ≥ 590 |
| Rp 0,2 (MPa) | ≥ 241 | ≥ 240 |
| A (%) | ≥ 30 | ≥ 30 |
The specified values are non-binding guide values.