STELLITE® Alloy 20 Product Introduction
STELLITE® Alloy 20 is a cobalt-based alloy known for its exceptional resistance to wear, corrosion, and high temperatures. This article provides a detailed introduction to STELLITE® Alloy 20, covering its chemical composition, mechanical properties, performance at different temperatures, industry applications, shapes and sizes, production standards, welding and processing capabilities, advantages and disadvantages, and comparisons with similar alloys.
Composition chimique
STELLITE® Alloy 20 is primarily composed of cobalt, chromium, tungsten, and carbon, with additional elements for enhanced properties.
| Élément | Composition (%) |
|---|---|
| Cobalt (Co) | 32.0 – 38.0 |
| Chrome (Cr) | 19.0 – 21.0 |
| Tungstène (W) | 2,0 – 3,0 |
| Carbone (C) | 0.15 – 0.35 |
| Nickel (Ni) | 2,0 maximum |
| Fer (Fe) | 3,0 maximum |
| Manganèse (Mn) | 1,0 maximum |
| Silicium (Si) | 1,0 maximum |
| Phosphore (P) | 00,03 maximum |
| Soufre (S) | 00,03 maximum |
Propriétés mécaniques
STELLITE® Alloy 20 exhibits excellent mechanical properties suitable for high-wear applications:
| Propriété | Valeur |
|---|---|
| Résistance à la traction, ksi (MPa) | 105 (725) min |
| Limite d'élasticité (compensation de 0,2 %), ksi (MPa) | 45 (310) minutes |
| Allongement (% en 2 pouces) | 30 minutes |
| Dureté, Rockwell C (HRC) | 25 – 35 |
Caractéristiques de performance
STELLITE® Alloy 20 offers outstanding performance in severe conditions:
- Résistance à l'usure : Exceptional resistance to abrasion, erosion, and metal-to-metal wear, making it ideal for high-stress wear environments.
- Résistance à la corrosion : Excellent resistance to oxidation and corrosion in high-temperature environments, including acids and alkalis.
- Résistance à haute température : Maintient une résistance et une dureté élevées à des températures élevées, jusqu'à environ 1 200 °F (650 °C).
Applications industrielles
STELLITE® Alloy 20 is widely used across various industries for its wear and corrosion resistance properties:
| Secteur industriel | Applications |
|---|---|
| Aérospatial | Bearing surfaces, valve components, and turbine blades requiring high wear resistance and durability. |
| Pétrole et Gaz | Pump components, valve seats, and drilling tools exposed to abrasive environments and corrosive fluids. |
| Production d'électricité | Boiler components, steam turbine seals, and high-wear parts in power plant equipment. |
| Machines industrielles | Outils de coupe, matrices d'extrusion et plaques d'usure dans les équipements de fabrication. |
Formes et tailles
STELLITE® Alloy 20 is available in various forms and sizes to meet specific application requirements:
- Formes: Feuilles, plaques, barres, tubes et formes personnalisées.
- Tailles : Épaisseur allant de 0,025 pouces à 1,000 pouces (0,64 mm à 25,4 mm), diamètre allant de 0,25 pouces à 6,0 pouces (6,35 mm à 152,4 mm).
Normes de production
STELLITE® Alloy 20 complies with industry standards for quality and performance:
| Formulaire de produit | Formes disponibles | Tailles disponibles | Normes de production |
|---|---|---|---|
| Barres | Barres rondes, barres carrées | Diamètre : 0,25″ – 6,0″ (6,35 mm – 152,4 mm) | ASTMA732 |
| Plaques/Feuilles | Plaques, Feuilles | Épaisseur : 0,025″ – 1,000″ (0,64 mm – 25,4 mm) | ASTMA732 |
| Baguettes de soudage | Tiges | Diamètre : 0,125″ – 0,500″ (3,18 mm – 12,7 mm) | AWS A5.13 |
Soudage et transformation
STELLITE® Alloy 20 offers good weldability and machinability:
- Soudage: Peut être soudé en utilisant des méthodes conventionnelles telles que le soudage TIG et MIG avec préchauffage et traitement thermique après soudage pour conserver les propriétés.
- Traitement: Machinable using carbide tooling, although care is needed due to its high cobalt content.
Avantages et inconvénients
| Aspect | Détails |
|---|---|
| Avantages | High wear resistance, excellent strength at elevated temperatures, good corrosion resistance, and ease of fabrication. |
| Désavantages | Coût plus élevé par rapport aux matériaux conventionnels, nécessite des techniques d'usinage et de soudage spécialisées en raison de la teneur élevée en cobalt. |
Alliages similaires
| Nom de l'alliage | Comparaison |
|---|---|
| STELLITE® Alliage 6 | Higher cobalt content, offering superior wear resistance and hardness compared to Alloy 20. |
Comparaison d'alliages similaires
| Propriété/caractéristique | STELLITE® Alloy 20 | STELLITE® Alliage 6 |
|---|---|---|
| Teneur en cobalt (%) | 32.0 – 38.0 | 54,0 – 62,0 |
| Teneur en chrome (%) | 19.0 – 21.0 | 27,0 – 32,0 |
| Teneur en tungstène (%) | 2,0 – 3,0 | 8,0 – 10,0 |
| Dureté, Rockwell C (HRC) | 25 – 35 | 48 – 55 |
| Applications | Composants de vannes, filières d'extrusion | Aerospace components, turbine blades |
This comprehensive article provides an in-depth introduction to STELLITE® Alloy 20, highlighting its chemical composition, mechanical properties, performance characteristics, industry applications, available forms and sizes, production standards, welding and processing capabilities, as well as advantages, disadvantages, and comparisons with similar alloys. Engineers and professionals seeking durable materials for high-wear and corrosion resistance applications will find this information valuable for selecting the appropriate alloy to meet their specific needs.