Waspaloy (UNS N07001) is a precipitation-hardenable nickel-based superalloy specifically engineered for high-temperature service in gas turbine and aerospace applications. This material has been a cornerstone of high-performance turbine component manufacturing since the 1950s, offering an exceptional combination of creep resistance, oxidation resistance, and high-temperature strength that makes it ideal for turbine blades, discs, and other hot-section components.
The alloy's chemical composition is carefully balanced to achieve optimal performance. With approximately 53-58% nickel as the base element, Waspaloy contains 18-21% chromium for oxidation and corrosion resistance, 12-15% cobalt for solid solution strengthening, 3-4% molybdenum for enhanced creep strength, 2.6-3.25% titanium and 1-1.5% aluminum for precipitation hardening through gamma prime (γ') phase formation. This precise chemistry enables Waspaloy to maintain mechanical integrity under extreme thermal and mechanical loading conditions typical in gas turbine combustion environments.
Waspaloy Chemical Composition (Weight %)
| Element | Content Range (%) | Primary Function |
|---|---|---|
| Nickel (Ni) | Balance (~53-58%) | Base matrix, high-temperature stability |
| Chromium (Cr) | 18.0-21.0 | Oxidation and corrosion resistance |
| Cobalt (Co) | 12.0-15.0 | Solid solution strengthening |
| Molybdenum (Mo) | 3.5-5.0 | Creep strength enhancement |
| Titanium (Ti) | 2.6-3.25 | Gamma prime precipitation hardening |
| Aluminum (Al) | 1.0-1.5 | Gamma prime formation, oxidation resistance |
| Carbon (C) | 0.02-0.10 | Grain boundary strengthening |
| Iron (Fe) | ≤2.0 | Impurity control |
Mechanical Properties are where Waspaloy truly distinguishes itself from competing alloys. At room temperature, the material typically exhibits tensile strength of 185-209 ksi (1275-1440 MPa), yield strength of 142-156 ksi (980-1075 MPa), and elongation of 22-33%, providing excellent ductility alongside strength. More critically, Waspaloy demonstrates exceptional creep rupture strength of approximately 89 ksi at 1200°F for 1000 hours, which is essential for turbine components subjected to sustained high-temperature loading over extended service periods.
I want to manufacture turbine blades with Waspaloy. What are the yield strength and tensile strength at 650°C, and do you have any recommendations? [7]
This real inquiry from an engineering professional on Eng-Tips forum in February 2025 illustrates the practical procurement challenges buyers face when sourcing Waspaloy components. The question specifically targets mechanical properties at elevated temperature (650°C / 1202°F), which is precisely where Waspaloy's creep resistance becomes the critical selection criterion. Community responses consistently directed the buyer to Special Metals technical bulletins and MMPDS (Metallic Materials Properties Development and Standardization) databases, emphasizing the importance of certified material documentation in aerospace procurement [7].

