Cobalt Alloys HY ST31 / Stellite 31 / UNS R30031 Product Introduction
Cobalt alloys such as HY ST31 (Stellite 31) and UNS R30031 are renowned for their exceptional resistance to wear, corrosion, and high temperatures. This article provides a comprehensive introduction to these alloys, covering their 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.
Chemische Zusammensetzung
HY ST31 (Stellite 31) and UNS R30031 have a complex chemical composition designed to achieve their high-performance properties:
| Element | Komposition (%) |
|---|---|
| Kobalt (Co) | 30.0 – 34.0 |
| Chrom (Cr) | 27.0 – 31.0 |
| Tungsten (W) | 12.0 – 15.0 |
| Nickel (Ni) | 3,0 – 5,0 |
| Eisen (Fe) | 3,0 – 4,5 |
| Molybdän (Mo) | 2.0 – 3.5 |
| Kohlenstoff (C) | 0.05 – 0,15 |
| Mangan (Mn) | 1,0 max |
| Silizium (Si) | 1,0 max |
| Phosphor (P) | 0.04 max |
| Schwefel (S) | 0.04 max |
Mechanische Eigenschaften
HY ST31 (Stellite 31) and UNS R30031 exhibit excellent mechanical properties suitable for high-stress applications:
| Eigentum | Wert |
|---|---|
| Zugfestigkeit, ksi (MPa) | 135 (930) Minuten |
| Streckgrenze (0,2 % Offset), ksi (MPa) | 105 (725) Minuten |
| Dehnung (% in 2 Zoll) | 20 Minuten |
| Härte, Rockwell C (HRC) | 38 – 44 |
Leistungsmerkmale
These cobalt alloys offer outstanding performance in severe environments:
- Verschleißfestigkeit: Exceptional resistance to abrasion, erosion, and metal-to-metal wear, making them ideal for high-stress wear applications.
- Korrosionsbeständigkeit: Excellent resistance to oxidation and corrosion in high-temperature and corrosive environments, including acids and alkalis.
- Hochtemperaturfestigkeit: Maintains strength and hardness at elevated temperatures, up to approximately 1200°F (650°C).
Branchenanwendungen
HY ST31 (Stellite 31) and UNS R30031 are utilized across various industries where durability and resistance to wear and corrosion are critical:
| Industriesektor | Anwendungen |
|---|---|
| Luft- und Raumfahrt | Turbine blades, combustion chambers, and high-temperature engine components. |
| Öl und Gas | Valves, pump components, and drilling equipment exposed to abrasive and corrosive fluids. |
| Medical | Surgical instruments, prosthetic devices, and biomedical implants requiring wear and corrosion resistance. |
Formen und Größen
These alloys are available in various forms and sizes to suit different applications:
- Formen: Bleche, Platten, Stangen, Rohre und kundenspezifische Formen.
- Größen: Die Dicke reicht von 0,025 Zoll bis 1,000 Zoll (0,64 mm bis 25,4 mm), der Durchmesser reicht von 0,25 Zoll bis 6,0 Zoll (6,35 mm bis 152,4 mm).
Produktionsstandards
HY ST31 (Stellite 31) and UNS R30031 conform to industry standards ensuring quality and reliability:
| Produkt Form | Verfügbare Formen | Verfügbare Größen | Produktionsstandards |
|---|---|---|---|
| Stangen/Stangen | Rundstäbe, Vierkantstäbe | Durchmesser: 0,25″ – 6,0″ (6,35 mm – 152,4 mm) | ASTM A732, AMS 5759 |
| Platten/Blätter | Platten, Blätter | Dicke: 0,025″ – 1,000″ (0,64 mm – 25,4 mm) | ASTM A732, AMS 5537 |
| Drähte | Drähte | Durchmesser: 0,010″ – 0,250″ (0,25 mm – 6,35 mm) | ASTM A580, AMS 5832 |
| Rohre/Rohre | Rohre, Rohre | Außendurchmesser: 0,250″ – 6,000″ (6,35 mm – 152,4 mm) | ASTM A732, AMS 5759 |
Schweißen und Bearbeiten
HY ST31 (Stellite 31) and UNS R30031 offer good weldability and machinability:
- Schweißen: Kann mit Standardmethoden wie WIG- und MIG-Schweißen mit entsprechender Vorwärmung und Wärmebehandlung nach dem Schweißen geschweißt werden.
- Wird bearbeitet: Bearbeitbar mit Hartmetallwerkzeugen, allerdings ist aufgrund ihrer hohen Härte und Zähigkeit Vorsicht geboten.
Vorteile und Nachteile
| Aspekt | Einzelheiten |
|---|---|
| Vorteile | High wear resistance, excellent strength at elevated temperatures, good corrosion resistance, and versatility in various applications. |
| Nachteile | Höhere Kosten im Vergleich zu herkömmlichen Materialien, erfordert aufgrund ihrer hohen Festigkeit und Härte Fachwissen in der Handhabung. |
Ähnliche Legierungen
| Legierungsname | Vergleich |
|---|---|
| Cobalt Alloy 6 | Higher cobalt content, offering superior wear resistance and hardness compared to HY ST31 and UNS R30031. |
Vergleich ähnlicher Legierungen
| Eigenschaft/Funktion | HY ST31 / UNS R30031 | Cobalt Alloy 6 |
|---|---|---|
| Kobaltgehalt (%) | 30.0 – 34.0 | 54,0 – 62,0 |
| Chromgehalt (%) | 27.0 – 31.0 | 25.0 – 32.0 |
| Wolframgehalt (%) | 12.0 – 15.0 | 8,0 – 10,0 |
| Härte, Rockwell C (HRC) | 38 – 44 | 48 – 55 |
| Anwendungen | Aerospace, Oil & Gas, Medical | Industriewerkzeuge, Verschleißteile |
This detailed article provides a comprehensive introduction to HY ST31 (Stellite 31) and UNS R30031, highlighting their 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-resistant applications will find this information valuable for selecting the appropriate alloy to meet their specific needs.