High temperature alloys
| UNS Number | UNS N07001 |
| Industry Name | W.Nr.2.4654, NiCr20Co13Mo4Ti3Al |
Product Forms | Billets, Rods, Bars, Wires |
General Characteristics
Waspaloy is a precipitation-hardening nickel-based superalloy. It was originally developed to address the limitations of early Nimonic alloys, which suffered from insufficient creep and rupture strength at temperatures above 760 °C for rotating gas turbine components. Early Nimonic grades offered good performance but lacked adequate high-temperature strength and microstructural stability under long-term thermal exposure.
It retains mechanical properties under high centrifugal and thermal loads, making it ideal for gas turbine discs, shafts, blades and hot-section fasteners.
Compared to Inconel 718, Waspaloy maintains strength far above 650°C while Inconel 718 degrades rapidly beyond this threshold. It has higher temperature capability but poorer machinability and higher cost. Compared to Nimonic 90, Waspaloy has superior creep performance for rotating turbine parts, whereas Nimonic 90 is more targeted to springs and static fasteners.
C | Cr | Mo | Ni | Co | Al | Ti | Fe | Si | Mn | P | S | B | Zr | Cu |
0.03-0.1 | 18.0-21.0 | 3.5-5 | Balance | 12.0-15.0 | 1.2-1.6 | 2.75-3.25 | ≤2 | ≤0.15 | ≤0.1 | ≤0.015 | ≤0.015 | 0.003-0.01 | 0.02-0.08 | ≤0.1 |
Oil & Petrochemical||High-temperature reactor fasteners|Valve stem components|Heat exchanger hardware|Pressure vessel bolting
Power Generation||Gas turbine rotor parts|Combustion assembly fasteners
Technical Standards | Product Form |
ASTM B637 | Bar, Forging, Forged Billet, Ring |
AMS 5708 | Bar, Forging, Ring, Wire |
AMS 5388 | Investment Castings, Master Alloy Ingots |
AMS 5709 | Wire |
Product form | Size range (mm) |
Forged bar | Dia.70-500 |
Rolled bar | Dia.2.0-70 |
Flat bar | T4-50*W60-300 |
Wire | Dia.0.25-18.0 |
Q1: What is its maximum continuous operating temperature?
A: Typical continuous service up to 760°C. Short peak temperature can reach 870°C. Creep rate increases sharply above 760°C.
Q2: Waspaloy vs Inconel 718?
A: Waspaloy retains strength well above 650°C while Inconel 718 degrades rapidly beyond this point. Waspaloy has higher temperature capability, but poorer machinability and higher material cost.
Q3: Waspaloy vs Nimonic 90?
A: Waspaloy uses molybdenum for solid-solution strengthening and has superior creep performance for rotating turbine discs and shafts. Nimonic 90 is optimized for static springs and high-temperature preload fasteners.
Q4: Can Waspaloy be used for springs?
A: It can be made into wire springs, but it is primarily engineered for rotating turbine components. Nimonic 90 or X 750 are more common choices when stress relaxation of springs is the top priority.