Cobalt alloys are a type of metal alloy that contains cobalt as the primary element. These alloys have a variety of uses in industries ranging from aerospace to jewelry making due to their unique properties.

The most common cobalt-based alloy is stainless steel. It is composed of iron, chromium, and a small amount of cobalt. This alloy has excellent corrosion resistance and is widely used in aircraft engines, surgical instruments, and marine equipment applications. Other cobalt-based alloys include high-speed steel (HSS), which contains tungsten and molybdenum to increase its heat resistance; Stellite, comprised of chromium, tungsten, and carbon for improved wear resistance; and Hastelloy C276, which has been designed for use in highly corrosive environments.