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Cobalt L-605 (also known as alloy 25) is a cobalt-based superalloy with high levels of chromium and tungsten. It is characterized by outstanding high-temperature strength up to 1500 °F (1093 °C), excellent oxidation resistance at high temperatures up to 2000 °F (1093 °C) in corrosive environments, and superior resistance to sulfidation wear and galling. Cobalt L-605 has other less-known qualities like high ductility and biocompatibility. Cobalt L-605 is non-magnetic.
That said, like most other superalloys, Cobalt L-605 can lose its ductility when exposed to intermediate temperatures for more extended periods.
The strength of Cobalt L-605 is achieved thanks to solid-solution strengthening by tungsten in the first phase and strengthening with precipitated carbides in the second phase. Cobalt L-605 has very good forming characteristics and can be readily forged, hot-worked, or cold worked.
Thanks to all of its characteristics, Cobalt L-605 finds use in the aerospace industry. It is mainly used for manufacturing of gas turbine engine components, especially those that are often subjected to high heat. These include rings and blades for turbines, and combustion chamber parts (combustor liners).
Apart from the aerospace industry, Cobalt L-605 finds use in land-based gas turbines in power plants, and in industrial furnaces for muffles and liners in high-temperature kilns. Cobalt L-605 can also be used for manufacturing of high-temperature ball bearings and bearing races. This superalloy can also find a use for parts used in corrosive environments, mainly with wet chlorine, hydrochloric acid, and nitric acid.
Chemical Composition of Cobalt L-605
|Element||Min (%)||Max (%)|
|Manganese, Mn||—||≤ 2.00|
|Silicon, Si||—||≤ 0.40|
|Sulfur, S||—||≤ 0.015|
|Phosphorus, P||—||≤ 0.02|
|Iron, Fe||—||≤ 3.00|
Mechanical and Physical Properties
|Density||0.335 lb/in3||9.27 g/cm3|
|Melting Range||2425 – 2570 °F||1330 – 1410 °C|
|Tensile Strength||154 ksi||1061 MPa|
|Tensile Strength, Yield 0.2%||75 ksi||517 MPa|
|Elongation in 2 inches (50 mm)||55 %||55 %|
|Elongation A5||25 %||25 %|
|Electrical Resistivity||34.9 µΩ in||88.6 µΩ cm|
|Magnetic Permeability at 200 oersteds||1.002||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||12.3 µm/m °C|
|Resistance on air (up to the temperature listed)||1994 °F||1090 °C|