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.
Kimyasal bileşim
STELLITE® Alloy 20 is primarily composed of cobalt, chromium, tungsten, and carbon, with additional elements for enhanced properties.
| Öğe | Kompozisyon (%) |
|---|---|
| Kobalt (Co) | 32.0 – 38.0 |
| Krom (Cr) | 19.0 – 21.0 |
| Tungsten (W) | 2.0 – 3.0 |
| Karbon (C) | 0.15 – 0.35 |
| Nikel (Ni) | Maksimum 2,0 |
| Demir (Fe) | Maksimum 3,0 |
| Manganez (Mn) | Maksimum 1,0 |
| Silikon (Si) | Maksimum 1,0 |
| Fosfor (P) | 0.03 max |
| Kükürt (S) | 0.03 max |
Mekanik özellikler
STELLITE® Alloy 20 exhibits excellent mechanical properties suitable for high-wear applications:
| Mülk | Değer |
|---|---|
| Çekme Dayanımı, ksi (MPa) | 105 (725) min |
| Akma Dayanımı (%0,2 ofset), ksi (MPa) | 45 (310) min |
| Uzama (2 inç cinsinden) | 30 min |
| Hardness, Rockwell C (HRC) | 25 – 35 |
Performance Characteristics
STELLITE® Alloy 20 offers outstanding performance in severe conditions:
- Wear Resistance: Exceptional resistance to abrasion, erosion, and metal-to-metal wear, making it ideal for high-stress wear environments.
- Corrosion Resistance: Excellent resistance to oxidation and corrosion in high-temperature environments, including acids and alkalis.
- High Temperature Strength: Maintains high strength and hardness at elevated temperatures, up to approximately 1200°F (650°C).
Endüstri Uygulamaları
STELLITE® Alloy 20 is widely used across various industries for its wear and corrosion resistance properties:
| Sanayi Sektörü | Uygulamalar |
|---|---|
| Havacılık | Bearing surfaces, valve components, and turbine blades requiring high wear resistance and durability. |
| Petrol ve Gaz | Pump components, valve seats, and drilling tools exposed to abrasive environments and corrosive fluids. |
| Güç üretimi | Boiler components, steam turbine seals, and high-wear parts in power plant equipment. |
| Industrial Machinery | Cutting tools, extrusion dies, and wear plates in manufacturing equipment. |
Şekiller ve boyutlar
STELLITE® Alloy 20 is available in various forms and sizes to meet specific application requirements:
- Forms: Sheets, plates, bars, tubes, and custom shapes.
- Sizes: Thickness ranging from 0.025 inches to 1.000 inches (0.64mm to 25.4mm), diameter ranging from 0.25 inches to 6.0 inches (6.35mm to 152.4mm).
Üretim Standartları
STELLITE® Alloy 20 complies with industry standards for quality and performance:
| Ürün Formu | Mevcut Şekiller | Mevcut Boyutlar | Üretim Standartları |
|---|---|---|---|
| Barlar | Round bars, square bars | Diameter: 0.25″ – 6.0″ (6.35mm – 152.4mm) | ASTM A732 |
| Plates/Sheets | Plakalar, Çarşaflar | Thickness: 0.025″ – 1.000″ (0.64mm – 25.4mm) | ASTM A732 |
| Welding Rods | Rods | Diameter: 0.125″ – 0.500″ (3.18mm – 12.7mm) | AWS A5.13 |
Welding and Processing
STELLITE® Alloy 20 offers good weldability and machinability:
- Welding: Can be welded using conventional methods such as TIG and MIG welding with preheating and post-weld heat treatment to maintain properties.
- Processing: Machinable using carbide tooling, although care is needed due to its high cobalt content.
Avantajlar ve dezavantajlar
| Bakış açısı | Detaylar |
|---|---|
| Avantajları | High wear resistance, excellent strength at elevated temperatures, good corrosion resistance, and ease of fabrication. |
| Dezavantajları | Higher cost compared to conventional materials, requires specialized machining and welding techniques due to high cobalt content. |
Similar Alloys
| Alloy Name | Karşılaştırmak |
|---|---|
| STELLITE® Alloy 6 | Higher cobalt content, offering superior wear resistance and hardness compared to Alloy 20. |
Comparison of Similar Alloys
| Özellik/Özellik | STELLITE® Alloy 20 | STELLITE® Alloy 6 |
|---|---|---|
| Cobalt Content (%) | 32.0 – 38.0 | 54.0 – 62.0 |
| Krom İçeriği (%) | 19.0 – 21.0 | 27.0 – 32.0 |
| Tungsten Content (%) | 2.0 – 3.0 | 8.0 – 10.0 |
| Hardness, Rockwell C (HRC) | 25 – 35 | 48 – 55 |
| Uygulamalar | Valve components, extrusion dies | 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.