The Alloy L605 is a cobalt-based, solid-solution strengthened alloy that has excellent high temperature strength, good oxidation resistance up to 1093°C, and excellent sulfidation resistance. This alloy also offers good resistance to wear and galling. The high temperature strength results from solid-solution strengthening by tungsten with second phase strengthening by precipitated carbides. Alloy L605 alloy is used in the hot sections of aircraft gas turbine engines (i.e., combustion liners), and for industrial furnace and other high temperature applications. Elsewhere, this grade is known as alloy 25.
Quken offers Alloy L605 in following forms:
| Product form |
|---|
| Strip | Sheet | Plate | Bar | Wire | Forgings |
Designations and standards :
| Standard | Material designation |
|---|
| UNS | R30605 |
Chemical composition %:
| | C | Mn | Si | P | S |
|---|
| MIN. | 0.05 | 1.00 | | | |
| MAX. | 0.15 | 2.00 | 0.40 | 0.040 | 0.03 |
| | Cr | Ni | W | Fe | Co |
|---|
| MIN. | 19.00 | 9.00 | 14.00 |
| Balance |
| MAX. | 21.00 | 11.00 | 16.00 | 3.00 | Balance |
Physical Constants:
| Density | 0.335 lb/in3 (9.27 g/cm3) |
| Melting Range | 2425 - 2570 °F (1330 - 1410 °C) |
| Electrical Resistivity | 34.9 µΩ⋅in (88.6 µΩ⋅cm) |
| Magnetic Permeability at 200 oersteds | 1.002 |
| Thermal Conductivity | 65 Btu⋅in/ft2 ⋅h⋅°F (9.4 W/m⋅K) |
| Specific Heat | 0.092 Btu/lb⋅°F (385 J/kg⋅°C) |
| Coefficient of Thermal Expansion, RT – 200°F | 6.8 × 10-6 in/in⋅°F (12.3µm/m⋅°C) |
Mechanical Properties (RT):
| 0.2% Yield Strength | Tensile Strength | Elongation in 2 in. or 50 mm |
|---|
| KSI | MPa | KSI | MPa | % |
|---|
| 75 | 517 | 154 | 1061 | 55 |
