Inconel X-750
2.4669Age-hardenable Ni-Cr-Fe superalloy for high-temperature spring and fastener applications. Strengthened by gamma-prime precipitation (Al+Ti). Oxidation and corrosion resistant to ~700°C service. Used for gas turbine springs, rocket engine thrust chambers, nuclear reactor components, and high-temp fasteners.
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| 🇺🇸 | ASTM | USA | UNS N07750 | N07750 | REF |
| 🇪🇺 | EN | Europe | NiCr15Fe7TiAl | 2.4669 | 100% |
| 🇺🇸 | AMS | USA | AMS 5542/5598/5667/5668 | — | 100% |
Sources: ASTM B637, DIN 17742, AMS
Chemical composition comparison (wt%)
Side-by-side: Inconel X-750 (ASTM) (ASTM B637) vs NiCr15Fe7TiAl (EN)
| Element | Inconel X-750 (ASTM) | NiCr15Fe7TiAl (EN) | Overlap |
|---|---|---|---|
| C | 0–0.08% | — | — |
| Si | 0–0.5% | — | — |
| Mn | 0–1% | — | — |
| S | 0–0.01% | — | — |
| Cr | 14–17% | — | — |
| Ni | ≥ 70% | — | — |
| Cu | 0–0.5% | — | — |
| Al | 0.4–1% | — | — |
| Ti | 2.25–2.75% | — | — |
| Nb | 0.7–1.2% | — | — |
| Co | 0–1% | — | — |
| Fe | 5–9% | — | — |
Mechanical properties
Precipitation hardened
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | ≥ 1100 | MPa |
| Yield Strength | ≥ 690 | MPa |
| Elongation | ≥ 20 | % |
| Hardness HRC | 30–38 | HRC |
| Elastic Modulus | ≥ 214 | GPa |
| Density | ≥ 8.28 | g/cm3 |
Heat treatment
| Process | Temperature | Medium | Holding Time | Notes |
|---|---|---|---|---|
| solution_treating | 1150–1175 °C | air | 2-4 hours | Equalizing treatment for coarse grain (creep resistance) |
| stabilizing | 845–845 °C | air | 24 hours | Stabilize carbides at grain boundaries |
| aging | 705–705 °C | air | 20 hours | Precipitate gamma-prime. Air cool. |
Compatibility verdict
Inconel X-750 and NiCr15Fe7TiAl: 100% composition match
Close equivalents but NOT identical.
Related materials
Hastelloy C-22
2.4602Improved version of Hastelloy C-276 with better resistance to oxidizing media and higher chromium. Considered the most versatile Ni-Cr-Mo alloy for chemical processing. Resists both oxidizing and reducing acids, chlorides, and mixed media. Used for flue gas desulfurization, pharmaceutical, and universal chemical processing.
Alloy 20 / Carpenter 20
2.4660Austenitic Ni-Fe-Cr alloy specifically developed for sulfuric acid resistance. Nb-stabilized against sensitization. Cu addition gives outstanding resistance to H2SO4 at all concentrations up to 80%. Used for sulfuric acid piping, heat exchangers, mixing tanks, pickling equipment, and pharmaceutical processing.
Nimonic 80A
2.4952Nickel-chromium age-hardenable alloy with Ti + Al for gamma-prime strengthening. Developed originally for gas turbine blades. Good creep resistance to ~700°C. Used for exhaust valves, springs at elevated temperatures, nuclear engineering fasteners, and gas turbine components. ≈ UNS N07080.
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