With the addition of aluminium and titanium, WASPALOY® has excellent strength at temperatures up to 650°C for critical gas turbine engine applications and good oxidation resistance for non-rotating parts in gas turbine applications up to 870°C.
| % | Cr | Ni | Mo | Co | Al | Ti | B | C | Zr | Fe | Mn | Si | P | S | Cu |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Min | 18 | - | 3.50 | 12 | 1.20 | 2.75 | 0.003 | 0.02 | 0.02 | - | - | - | - | - | - |
| Max | 21 | Balance | 5 | 15 | 1.60 | 3.25 | 0.01 | 0.10 | 0.08 | 2.00 | 0.10 | 0.15 | 0.015 | 0.015 | 0.10 |
WASPALOY® is an alloy of choice for both rotating and non-rotating parts in aerospace gas turbines due to its high strength and oxidation resistance at elevated temperatures.
Welding of WASPALOY® is difficult and best performed on material in the solution annealed condition. Limiting the amperage whilst minimising the fusion zone, combined with rapid cooling from welding, is necessary to minimise aging stresses. After welding, the fabrication should be solution treated, using rapid heating and cooling rates through the aging range. This should be followed by a stabilisation and aging treatment.
Waspaloy® is the registered trademark of United Technologies Corp.
| Mechanical & Physical Properties | 204°C | 538°C | 649°C | 760°C | 871°C | 982°C |
|---|---|---|---|---|---|---|
| Coefficient of Thermal Expansion µm/m⁰C | 12.6 | 14 | 14.6 | 15.1 | 16 | 17.5 |
| Thermal Conductivity /kcal/(hr.m.°C) | 10.9 | 15.5 | 17.3 | 19 | 20.7 | - |
| Modulus of Elasticity/ x105 MPa | 2.07 | 1.86 | 1.79 | 1.65 | 1.59 | 1.45 |
| Temperature °C | 649°C | 704°C | 760°C | 816°C | 871°C |
|---|---|---|---|---|---|
| 100 hours, ksi | 92 | 75 | 53 | 32 | 18 |
| 1,000 hours, ksi | 80 | 57 | 35 | 19 | 10 |
Proud members of the British Valve & Actuator Association