Stellite 21

Stellite cobalt-based alloys consist of complex carbides in the alloy matrix. They are resistant to abrasion, abrasion and corrosion and retain these properties at high temperatures. Its excellent wear resistance is mainly attributed to the unique inherent properties of the hard carbide phase dispersed in the CoCr alloy matrix.

Stellite 21 (formerly Stellite 8) developed

It emerged in the mid-1930s as a corrosion-resistant CoCr alloy and quickly found application as a biocompatible hip implant and denture alloy. Many alloys currently used in medical applications are variations of the original Stellite 21 composition. It was also one of the first heat-resistant alloys attempted for use in jet engines.

Stellite 21 consists of a CoCrMo alloy matrix containing dispersed hard carbides, which strengthen the alloy and increase its hardness, but also reduce ductility. The type, shape, size and distribution of carbides are strongly affected

Due to the processing history of the alloy, the mechanical properties of Stellite 21 are highly dependent on the manufacturing route and any subsequent heat treatment.

Due to the low carbide volume fraction, the cobalt-based alloy matrix dominates the wear and corrosion properties. Stellite 21 has excellent resistance to cavitation, abrasion and metal-to-metal sliding wear but is not recommended for severe hard particle wear. During wear and even during machining, the surface hardens significantly and using the correct machining tools and techniques is important to obtain the best results.

Stellite 21 offers excellent resistance to thermal and mechanical shock. Optimum high temperature strength is achieved by solution heat treatment at 1200–1240C (2190–2265F), followed by quenching and aging in the temperature range 700–1150C (1290–2100F).

Stellite 21 can be cast, powder metallurgically processed or used as a welding hard facing. Recommended for applications involving cavitation, erosion, corrosion and/or high temperatures, such as petrochemical and power generation valve trim. Due to its good impact resistance, it is widely used in the manufacture of forging or hot stamping dies. Oxyacetylene welding deposition methods are not recommended for this alloy.

Nominal Composition (Mass %) and Physical Properties

Be used in a wide range of industries.

 

pipe

sheet

rod

OEM&ODM

OEM&ODM

OEM&ODM

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