Stellite 21

Stellite 21 / CoCr27Mo5Ni2.5 / UNS R30003 / R30008

Stellite 21 is a cobalt-chromium-molybdenum alloy renowned for its exceptional wear resistance, corrosion resistance, and high-temperature performance. As a part of the Stellite family, this alloy is specifically engineered for applications that must withstand extreme conditions, such as wear, heat, and harsh chemical environments.

The composition primarily consists of cobalt (Co), with chromium (Cr), molybdenum (Mo), nickel (Ni), and a small amount of carbon (C) as alloying elements that provide a balanced and durable material.

Properties of Stellite 21

Stellite 21 offers an exceptional combination of properties that make the material particularly suitable for applications with high mechanical and thermal stress. It retains its strength and wear resistance at elevated temperatures while also providing excellent resistance to oxidation and corrosion, even in marine and chemically aggressive environments.

Thanks to the low carbon content in the alloy, there is a good balance between toughness and hardness, which helps prevent fatigue and cracking. These properties make the material widely applicable, even in applications where both mechanical and chemical durability are required.

The standards ASTM F1058 and ISO 5832-7 define the chemical and mechanical specifications of Stellite 21 for use in surgical implants. They ensure that the material meets strict medical requirements, including biocompatibility, structural integrity, and long-term reliability.

Applications of Stellite 21

Stellite 21 is extensively used in the oil and gas industry, particularly for valve seats and closures that need to operate under high pressure and temperature for extended periods. In the aerospace industry, it is used in turbines and engine parts that must withstand significant thermal and mechanical stress.

Furthermore, Stellite 21 is applied in industrial knives, bearings, metal finishing components, and parts exposed to seawater due to its excellent corrosion resistance. In the medical sector, this alloy is also used for implants such as heart valves, where biocompatibility and wear resistance are crucial.

Stellite 21 is the optimal choice for applications that combine extreme wear, corrosion, and temperature challenges.

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