X750 is a Nickel-Chromium alloy made precipitation hardenable by additions of Al and Ti, having creep-rupture strength at high temperatures to about 700oC (1290oF). It is widely used for high temperature conditions but is not as strong as Nimonic 90.
Inconel® X750 is also known as Nicrofer 7016, Superimphy 750, Haynes X750, Pyromet X750, and Udimet X750.
| Element | Min % | Max % |
| C | – | 0.08 |
| Mn | – | 1.00 |
| Si | – | 0.50 |
| S | – | 0.01 |
| Cr | 14.00 | 17.00 |
| Ni | 70.00 | – |
| Nb/Cb | 0.70 | 1.20 |
| Ti | 2.25 | 2.75 |
| Al | 0.40 | 1.00 |
| Fe | 5.00 | 9.00 |
| Co | – | 1.00 |
| Ta | – | 0.05 |
| Cu | – | 0.50 |
Density
8.28g/cm³ | 0.299 lb/in³
Melting Point
1430°C | 2600°F
Coefficient of Expansion
12.6 μm/m °C (20 – 100°C) | 7.0 x 10-6 in/in °F (70 – 212°F)
Modulus of Rigidity
75.8 kN/mm² | 10994 ksi
Modulus of Elasticity
218.0 kN/mm² 212.4 kN/mm² 213.7 kN/mm² | 31619 ksi 30806 ksi 30995 ksi
Heat Treatment of Finished Parts
| Condition as supplied by Alloy Wire | Type | Temperature | Time (Hr) | Cooling | |
| °C | °F | ||||
| Spring Temper | Age Harden | 650 | 1200 | 4 | Air |
| Spring Temper (3 Part) | Anneal Stabalize Age Harden |
1150 843 704 |
2100 1550 1300 |
2 † 24 20 |
Air Air Air |
| No. 1 Temper | Age Harden | 730 | 1350 | 16 | Air |
Properties
| Condition | Approx. tensile strength | Approx. operating temperature | ||
| N/mm² | ksi | °C | °F | |
| Annealed | 800 – 1000 | 116 – 145 | – | – |
| No 1 Temper | 900 – 1150 | 130 – 167 | – | – |
| Spring Temper | 1100 – 1500 | 160 – 218 | – | – |
| No 1 Temper + Aged | 1300 – 1450 | 188 – 210 | -200 to +550 | -330 to +1020 |
| Spring Temper + Aged | 1350 – 1750 | 196 – 254 | -200 to +370 | -330 to +700 |
| Spring Temper + 3 part heat treated | 1100 – 1250 | 159 – 181 | -200 to +550 | -330 to +1020 |