Waspaloy: High-Strength Gamma-Prime Strengthened Nickel Superalloy
· Published: 2026-08-10 · Updated: August 2026
Waspaloy is a gamma-prime precipitation-hardened nickel-based superalloy developed by Pratt & Whitney for high-temperature aerospace applications. With a nominal composition of 19% chromium, 14% cobalt, 4.3% molybdenum, 3% titanium, and 1.4%...
Waspaloy is a gamma-prime precipitation-hardened nickel-based superalloy developed by Pratt & Whitney for high-temperature aerospace applications. With a nominal composition of 19% chromium, 14% cobalt, 4.3% molybdenum, 3% titanium, and 1.4% aluminum, Waspaloy achieves an excellent balance of tensile strength, creep resistance, and oxidation resistance at temperatures up to 870°C. It is extensively used in gas turbine engine components including turbine discs, compressor blades, shafts, and spacers where high strength at elevated temperature is critical for safety and performance. Waspaloy requires careful heat treatment including solution treatment and two-step aging to develop optimal mechanical properties.
Quick Facts
| Category | |
| Standard | |
| Density | 8.22 g/cm³ |
| Yield Strength | |
| Tensile Strength |
Global Equivalents & Cross-Reference
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Frequently Asked Questions
What is the yield strength of Waspaloy at room temperature?
Waspaloy in the fully heat-treated condition achieves approximately 760 MPa (110 ksi) yield strength at room temperature, with ultimate tensile strength of 1280 MPa (186 ksi).
Can Waspaloy be welded?
Waspaloy has limited weldability due to its high gamma-prime content and susceptibility to strain-age cracking. Specialized welding procedures including preheat, low heat input, and post-weld heat treatment are required. Inertia welding and electron beam welding are commonly used for Waspaloy components.
References & International Standards
- ASTM International. Standard Specifications for Steel & Metal Alloys. astm.org
- International Organization for Standardization (ISO). Metallic Materials — Cross-Reference Database. iso.org
- American Iron and Steel Institute (AISI). Steel Grade Designations & Equivalents. steel.org
- European Committee for Standardization (CEN). EN Steel Standards & Numbering System. cencenelec.eu
Specialty Metals — Engineering Reference
Non-ferrous metals — aluminum, copper, titanium, zinc, magnesium — serve applications where steel cannot: electrical conductivity, thermal management, weight reduction, corrosion resistance in specific chemical environments. Each metal family has its own classification system and selection logic.
ASTM B209/B221 (Al), ASTM B152/B187 (Cu), ASTM B265/B348 (Ti), ASTM B86 (Zn), ASTM B90/B91 (Mg)
Electrical wiring and busbars (Cu), aircraft structures and automotive bodies (Al), medical implants and aerospace fasteners (Ti), die-cast consumer products (Zn), lightweight electronic enclosures (Mg)
Galvanic corrosion is the #1 failure mode in multi-metal assemblies. When joining dissimilar metals, consult the galvanic series: the more anodic metal will corrode preferentially. Use isolating washers, protective coatings, or select metals close together on the galvanic series.