Alloy X750
2.4669 – N07750
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Material description
The material 2.4669 is a precipitation-hardenable nickel-chromium alloy. The material has excellent corrosion and oxidation resistance up to temperatures of approx. 980 °C. In addition, 2.4669 (Alloy X750) has a high strength up to approx. 700 °C.
After ageing, the material also exhibits high creep rupture strength and a low creep rate up to approx. 815 °C. The good ductility (even at low temperatures) rounds off the positive material properties.
AN OVERVIEW OF THE PROPERTIES OF 2.4669:
- Excellent corrosion and oxidation resistance
- High strength
- High creep strength
- Low creep rate
- Good ductility
Applications
- Aircraft engines
- Heat treatment devices
- Extrusion and moulding tools
Chemical composition in %
| ASTM B637 | ||
|---|---|---|
| C, max. | 0,08 | |
| Mn, max. | 1,00 | |
| Si, max. | 0,50 | |
| S, max. | 0,01 | |
| Cr | 14,00 – 17,00 | |
| Co, max. | 1,00 | |
| Nb + Ta | 0,70 – 1,20 | |
| Ti | 2,25 – 2,75 | |
| Al | 0,40 – 1,00 | |
| Fe | 5,00 – 9,00 | |
| Cu, max. | 0,50 | |
| Ni, min. | 70,00 |
Mechanical properties
| solution annealed at 1149°C, stabilised + precipitation hardened | Bar | forging Type 1 | |
|---|---|---|
| Rm (MPa) | ≥ 965 | |
| Rp 0,2 (MPa) | ≥ 620 | |
| A (%) | ≥ 8 | |
| Hardness (HB) | ≥ 262 |
Mechanical properties
| solution annealed at 982°C + precipitation hardened | Bar | forging Type 2 / D < 63,5 mm | Bar | forging Type 2 / 63,5 mm ≤ D ≤ 101,6 mm |
|---|---|---|
| Rm (MPa) | ≥ 1170 | ≥ 1170 |
| Rp 0,2 (MPa) | ≥ 790 | ≥ 790 |
| A (%) | ≥ 18 | ≥ 15 |
| Z (%) | ≥ 18 | ≥ 15 |
| Hardness (HB) | 302 – 363 | 302 – 363 |
Mechanical properties
| solution annealed at 1100°C + precipitation hardened | Bar | forging Type 3 | |
|---|---|---|
| Rm (MPa) | 1103 – 1276 | |
| Rp 0,2 (MPa) | 689 – 896 | |
| A (%) | ≥ 20 | |
| Z (%) | ≥ 20 | |
| Hardness (HB) | 267 – 363 |
The specified values are non-binding guide values.