Alloy X-750 is a precipitation hardenable Nickel-Chromium alloy with high strength at temperatures up to 1300°F (704°C) and oxidation resistance up to 1800°F (982°C). It offers excellent resistance to relaxation and as a result it is widely used for springs operating at elevated temperatures, It has high ductility and excellent properties at cryogenic temperatures.
| Zeon Grade | Alloy Name | UNS | EN / DIN / W Nr. | Trademarks |
|---|---|---|---|---|
| ZeonX750 | Alloy X750 | UNS N07750 | 2.4669 | Inconel X750 |
| Element | Content (%) |
|---|---|
| Chromium, Cr | 14-17 |
| Iron, Fe | 5-9 |
| Titanium, Ti | 2.25-2.75 |
| Manganese, Mn | 1 max |
| Niobium, Nb | 0.7-1.2 |
| Copper, Cu | 0.5 max |
| Silicon, Si | 0.5 max |
| Aluminum, Al | 0.4-1 |
| Carbon, C | 0.08 max |
| Sulfur, S | 0.01 min |
| Nickel, Ni | Remainder |
| Properties | Metric | Imperial |
|---|---|---|
| Density | 8.26 g/cm³ | 0.298 lb/in³ |
| Melting point | 1413°C | 2575°F |
| Properties | Metric | Imperial |
|---|---|---|
| Tensile strength | 1325 MPa | 192.2 ksi |
| Elongation at break (in 51 mm) | 23.60% | 23.60% |
| Reduction of area | 42% | 42% |
| Properties | Metric | Imperial |
|---|---|---|
| Thermal expansion co-efficient (at 20-500°C/70-800°F) | 14.3 µm/m°C | 7.8 µin/in°F |
| Thermal conductivity (at 200°C/400°F) | 14.1 W/mK | 98 BTU in/hr.ft².°F |
| Machinability | Alloy X750 alloy can be machined using conventional machining methods, which are used for iron-based alloys. Machining operations are performed using machining coolants. High-speed operations such as grinding, turning, or milling, are performed using water-base coolants. Drilling, broaching, tapping, or boring are performed using heavy lubricants. |
|---|---|
| Forming | Alloy X750 alloy can be formed using all conventional techniques. |
| Welding: | Alloy X750 alloy is welded using shielded metal-arc welding, gas-tungsten arc welding, gas metal-arc welding, and submerged-arc welding methods. |
| Heat Treatment | Alloy X750 alloy is heat treated by annealing at 885 to 1149°C (1625 to 2100°F). |
| Forging | Alloy X750 alloy is forged at temperatures ranging from 1205 to 1038°C (2200 to 1900°F). |
| Hot Working | Alloy X750 alloy is hot worked at temperatures ranging from 983 to 1038°C (1800 to 2200°F). |
| Cold Working | Alloy X750 alloy can be cold worked using standard tooling. Soft die materials such as bronze and zinc alloys, are used for providing good finish and reducing galling problems. |
| Annealing | Alloy X750 alloy is annealed at 983 to 1038°C (1800 to 2000°F) followed by cooling. |
| Applications | Alloy X750 alloy is mainly used in structural members of hot sections of gas turbines such as ducts, thrust reversers, discs. |