Cobalt L-605

Cobalt L-605 is characterized by good formability and fabricability. It can be easily forged and hot worked at temperatures between 1900 °F, and 2300 °F (1038 °C to 1260 °C), or cold worked in case of bending, spinning and drawing.

However, this superalloy hardens very rapidly during working. To mitigate this, we recommend using regular annealing treatments at intermediate temperatures, especially if the end parts are very complex.

Cobalt L-605 can be readily welded using standard methods, including tungsten arc, gas metal arc, shielded metal arc, electron beam, and resistance welding. That said, even though it is doable, welding using the submerged arc welding process is not recommended. Minimum restraint and low interpass temperature are recommended for successful weld, as well as rapid cooling afterward.

What is L-605 used for?

L-605 is used in aerospace and industrial applications that require high-temperature strength, oxidation resistance, and durability, including turbine components, combustion systems, and exhaust hardware.

Is L-605 the same as Haynes® 25?

Yes. L-605 and Haynes® 25 refer to the same cobalt-chromium-tungsten alloy. Both names are commonly used in aerospace and high-temperature material specifications.

Is L-605 suitable for high-temperature service?

Yes. L-605 is specifically designed for elevated-temperature environments and retains strength, ductility, and oxidation resistance at temperatures exceeding the limits of many stainless steels.

Is L-605 magnetic?

L-605 is generally considered non-magnetic, making it suitable for applications where magnetic interference must be minimized.

How does L-605 compare to Haynes® 188?

Both alloys are cobalt-based and designed for high-temperature service. L-605 offers excellent strength and oxidation resistance, while Haynes® 188 typically provides superior resistance to thermal fatigue and oxidation in cyclic high-temperature environments. Alloy selection depends on operating conditions and performance requirements.