Stellite™ 21 Alloy Planilha

Wrought Cobalt Alloy

Fornecido por Kennametal Stellite

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Descrição do Produto
Stellite™ 21 (previously known as Stellite™ 8) was developed in the mid 1930s as a corrosion resistant CoCr alloy, and rapidly found application as a biocompatible hip implant and denture alloy. Many of the alloys currently used in medical applications are variants of the original Stellite™ 21 composition. It was also one of the first heat-resistant alloys trialled 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 decrease the ductility. The type, shape, size, and distribution of the carbides is strongly influenced by the processing history of the alloy, and for this reason the mechanical properties of stellite™ 21 are very dependent upon the manufacturing route and any subsequent heat treatments.

Due to the low volume fraction of carbides, the Co-based alloy matrix dominates the wear and corrosion properties. Stellite™ 21 has excellent cavitation, galling and metal-to-metal sliding wear resistance, but is not recommended for severe hard particle abrasion. The surface can work harden considerably during wear or even during machining, and the use of correct machining tools and techniques is important to achieve optimal results.

Stellite™ 21 has excellent resistance to thermal and mechanical shock. Optimum high temperature strength is obtained by solution heat treatments at 1200-1240°C (2190 - 2265°F) followed by quenching, and aging in the temperature range 700-1150°C (1290-2100°F).

Stellite™ 21 can be cast, powder metallurgically processed, or applied as a weld hardfacing. It is recommended for applications involving cavitation, erosion, corrosion and/or high temperatures, such as valve trim for petrochemical and power generation. Due to its good impact resistance, it has been widely used in the building up of forging or hot stamping dies. The oxyacetylene weld deposition method is not recommended for this alloy.
Geral  
Status do Material 
  • Comercial: Ativo
Disponibilidade 
  • América do Norte
  • Ásia/Pacífico
  • Europa
Available Documents
Technical Datasheet (English)
Metals General
Valor Típico
Unidade
 
Applicable Specifications
 
 
Forms Available
 
 
Metal Type
 
 
Alloy Identification
 
 
Metals Type Analysis
Valor Típico
Unidade
 
Type Analysis
     
Carbon
%
 
Chromium
%
 
Cobalt
%
 
Molybdenum
%
 
Nickel
%
 
Metals Physical
Valor Típico
Unidade
 
Densidade
lb/in³
 
Metals Mechanical
Valor Típico
Unidade
 
Tensile Strength (Ultimate) 2 (73°F)
ksi
 
Tensile Strength (Yield), 0.2% 2 (73°F)
ksi
 
Tensile Elongation (Break) 2 (73°F)
%
 
Dureza
     
HRC-Scale
 
 
HV-Scale
 
 
Módulo de Tensão 2 (73°F)
ksi
 
Metals Thermal
Valor Típico
Unidade
 
Mean CTE (68 para 212°F)
in/in/°F
 
Condutividade térmica (73°F)
Btu·in/hr/ft²/°F
 
Metals Electrical
Valor Típico
Unidade
 
Electrical Resistivity (73°F)
ohms·cir·mil/ft
 
Notas
1Propriedades típicas: não devem ser consideradas como especificações.
2Castings
 
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