Waspaloy
2.4654Nickel-based gamma-prime strengthened superalloy — THE turbine disc material. Excellent creep-rupture strength up to 650°C (rotating) and 870°C (static). Developed 1950s by Pratt & Whitney. Triple-aged (solution + stabilize + precipitation) for peak properties. Superior to Inconel 718 above 650°C. Used for compressor and rotor discs, shafts, spacers, seals, rings, casings, and fasteners in gas turbine engines.
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| 🇺🇸 | UNS | USA | UNS N07001 | N07001 | REF |
| 🇪🇺 | EN | Europe | NiCr20Co13Mo4Ti3Al / 2.4654 | 2.4654 | 100% |
| 🇺🇸 | AMS | USA | AMS 5544 (sheet) / AMS 5706 (bar) | — | 100% |
Sources: ASTM B637, EN ISO 9723, AMS 5706
Chemical composition comparison (wt%)
Side-by-side: Waspaloy (UNS) (ASTM B637) vs NiCr20Co13Mo4Ti3Al / 2.4654 (EN)
| Element | Waspaloy (UNS) | NiCr20Co13Mo4Ti3Al / 2.4654 (EN) | Overlap |
|---|---|---|---|
| C | 0.02–0.1% | — | — |
| Si | 0–0.75% | — | — |
| Mn | 0–1% | — | — |
| Cr | 18–21% | — | — |
| Mo | 3.5–5% | — | — |
| Ni | — | — | — |
| Al | 1.2–1.6% | — | — |
| Ti | 2.75–3.25% | — | — |
| B | 0.003–0.01% | — | — |
| Co | 12–15% | — | — |
| Fe | 0–2% | — | — |
| Zr | 0.02–0.12% | — | — |
Mechanical properties
Aged
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | 1170–1310 | MPa |
| Yield Strength | 720–895 | MPa |
| Elongation | 15–25 | % |
| Hardness HRC | 34–44 | HRC |
| Elastic Modulus | ≥ 213 | GPa |
| Density | ≥ 8.19 | g/cm3 |
Heat treatment
| Process | Temperature | Medium | Holding Time | Notes |
|---|---|---|---|---|
| solution_treatment | 996–1010 °C | air or oil | 2-4 hours | Type B per Special Metals for tensile properties |
| stabilization | 843–843 °C | air | 4 hours | Intermediate aging step |
| precipitation_aging | 760–760 °C | air | 16 hours | Gamma-prime precipitation |
Compatibility verdict
Waspaloy and NiCr20Co13Mo4Ti3Al / 2.4654: 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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