Excellent strength for continues service to 1800 °F. Oxidation and carburization resistance to 1900 °F. Galling resistant, with resistance to marine environments, acids and body fluids. Non-magnetic, even when severely cold reduced, can reach Rc 50 when cold reduced and aged. Resistant to hydrochloric and nitric acid at certain concentrations and temperatures, and wet chlorine environments at room temperature.
Gas turbine engine components: combustion chambers, and afterburners. Other uses also include: high temperature ball bearing service, springs, and heart valves.

Alloy L-605 is the strongest of the formable cobalt alloys, useful for continuous service to 1800 °F. Because of long and widespread use, this alloy has been the subject of many investigations to determine its properties over a wide range of conditions, thus making it an unusually well characterized material. Alloy L-605 is also known as alloy 25.

When exposed for prolonged periods at intermediate temperatures, alloy L-605 exhibits a loss of room temperature ductility in much the same fashion as other super alloys, such as X or 625.

Alloy L-605 is welded using gas tungsten arc, gas metal arc, shielded metal arc, electron beam and resistance welding. Submerged arc welding is not recommended. Use good joint fit-up, minimum restraint, low inter-pass temperature and cool rapidly from welding. For maximum ductility fabricated components should be annealed 2150 - 2250 °F, rapid cool.

Corrosion Resistance
Resistance to high temperature oxidation and carburization is good. The alloy, while not primarily intended for aqueous corrosion, is also resistant to corrosion by acids such as hydrochloric and nitric acid, as well as being resistant to wet chlorine solutions.

Applications

• Gas turbine engine combustion chambers and afterburners

• High temperature ball bearings and bearing races

• Springs

• Heart valves

Features

• Outstanding high temperature strength

• Oxidation resistant to 1800 °F

• Galling Resistant

• Resistant to marine environments, acids and body fluids