HAYNES 25 (L605) Alloy Product Introduction
HAYNES 25, also known as L605 or Stellite 25, is a cobalt-based superalloy renowned for its excellent high-temperature strength, wear resistance, and corrosion resistance. This article provides a comprehensive introduction to HAYNES 25 (L605), 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.
Chemical Composition
HAYNES 25 (L605) has a complex chemical composition designed to achieve its high-performance properties:
| Element | Composition (%) |
|---|---|
| Cobalt (Co) | 50.0 |
| Chromium (Cr) | 20.0 |
| Tungsten (W) | 15.0 |
| Nickel (Ni) | 10.0 |
| Iron (Fe) | 3.0 |
| Molybdenum (Mo) | 1.0 |
| Carbon (C) | 0.10 max |
| Manganese (Mn) | 1.0 max |
| Silicon (Si) | 1.0 max |
| Phosphorus (P) | 0.04 max |
| Sulfur (S) | 0.03 max |
| Boron (B) | 0.01 max |
Mechanical Properties
HAYNES 25 (L605) exhibits impressive mechanical properties suitable for high-stress applications:
| Property | Value |
|---|---|
| Tensile Strength, ksi (MPa) | 160 (1100) min |
| Yield Strength (0.2% offset), ksi (MPa) | 120 (828) min |
| Elongation (% in 2 inches) | 15 min |
| Hardness, Rockwell C (HRC) | 40 – 50 |
Performance Characteristics
HAYNES 25 (L605) offers exceptional performance in extreme environments:
- High Temperature Strength: Maintains strength and toughness at temperatures up to 1800°F (980°C), making it suitable for gas turbine engines and other high-temperature applications.
- Wear and Corrosion Resistance: Excellent resistance to wear, corrosion, and oxidation in harsh environments, including aerospace and industrial applications.
Industry Applications
HAYNES 25 (L605) is utilized across various industries where high performance and reliability are crucial:
| Industry Sector | Applications |
|---|---|
| Aerospace | Gas turbine components, combustion chambers, thrust reversers, and other hot section parts requiring high strength and heat resistance. |
| Medical | Surgical implants, prosthetic devices, and other biomedical applications due to biocompatibility and corrosion resistance. |
| Industrial | Cutting tools, bearings, valves, and components for chemical processing and oil & gas industries. |
Shapes and Sizes
HAYNES 25 (L605) is available in various forms and sizes to meet specific application needs:
- Forms: Sheets, plates, bars, tubes, wires, and custom shapes.
- Sizes: Thickness ranging from 0.010 inches to 1.000 inches (0.25mm to 25.4mm), diameter ranging from 0.125 inches to 12.000 inches (3.18mm to 304.8mm).
Production Standards
HAYNES 25 (L605) complies with stringent industry standards for quality and performance:
| Product Form | Shapes Available | Sizes Available | Production Standards |
|---|---|---|---|
| Bars/Rods | Round bars, square bars | Diameter: 0.125″ – 12.000″ (3.18mm – 304.8mm) | AMS 5759, AMS 5796 |
| Plates/Sheets | Plates, Sheets | Thickness: 0.010″ – 1.000″ (0.25mm – 25.4mm) | AMS 5537, AMS 5759 |
| Wires | Wires | Diameter: 0.010″ – 0.250″ (0.25mm – 6.35mm) | AMS 5796, AMS 5797 |
| Tubes/Pipes | Tubes, Pipes | OD: 0.250″ – 6.000″ (6.35mm – 152.4mm) | AMS 5759, AMS 5796 |
Welding and Processing
HAYNES 25 (L605) offers good weldability and machinability:
- Welding: Can be welded using conventional methods such as TIG and MIG welding with proper preheating and post-weld heat treatment.
- Processing: Machinable using carbide tooling, although it tends to work-harden and requires adequate cooling during machining.
Advantages and Disadvantages
| Aspect | Details |
|---|---|
| Advantages | High strength at elevated temperatures, excellent wear and corrosion resistance, biocompatibility for medical applications, and good machinability. |
| Disadvantages | Higher cost compared to conventional materials, requires expertise in handling due to its high strength and hardness. |
Similar Alloys
| Alloy Name | Comparison |
|---|---|
| HAYNES 188 | Similar high-temperature capabilities but with higher cobalt content and better oxidation resistance compared to HAYNES 25. |
Comparison of Similar Alloys
| Property/Feature | HAYNES 25 (L605) | HAYNES 188 |
|---|---|---|
| Cobalt Content (%) | 50.0 | 39.0 |
| Chromium Content (%) | 20.0 | 22.0 |
| Tungsten Content (%) | 15.0 | 13.0 |
| Yield Strength (ksi) | 120 | 90 |
| Applications | Gas turbine components, medical implants | Aerospace components, high-temperature structural parts |
This detailed article provides a comprehensive introduction to HAYNES 25 (L605), 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 high-performance materials for applications demanding strength, corrosion resistance, and reliability will find this information useful in selecting the appropriate alloy for their specific needs.