Stellit

Stellit is a family of cobalt-based superalloys developed by Elwood Haynes in the early 20th century. The name "Stellite" is a registered trademark. These alloys are known for their exceptional hardness, wear resistance, and ability to retain their strength at high temperatures. The primary alloying element in Stellit is cobalt, with significant additions of chromium, tungsten, and often molybdenum and nickel.

The unique properties of Stellit alloys make them suitable for a wide range of demanding applications. They are frequently used in components subjected to high stress, friction, and elevated temperatures. Common uses include cutting tools, bearings, valves, pump components, and wear-resistant coatings on various industrial machinery. The resistance to corrosion and oxidation further expands their utility in harsh environments.

The specific composition of a Stellit alloy can be tailored to optimize for particular performance characteristics. For example, variations in tungsten content can influence hardness and wear resistance, while the amount of chromium affects corrosion resistance. Due to their excellent performance, Stellit alloys are often used where other materials would fail prematurely. Their production involves specialized casting and manufacturing processes to achieve the desired microstructures and properties.