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Stellite 6
Material Type
Metal
Material Name
Stellite 6
Alternative Names
UNS R30006
Process Compatibility
CNC Milling, CNC Turning
introduction
Stellite 6 in CNC Machining
Stellite 6, with its lowest levels of C and W, exhibits excellent toughness, allowing it to withstand impacts under both cold and hot conditions with minimal risk of cracking.
Stellite 6 alloy, known for its high hardness and wear resistance, requires the use of wear-resistant hard alloy cutting tools during machining. Setting appropriate cutting parameters such as moderate cutting speeds and feed rates ensures machining stability and high-quality surface finish. Coolant should be used to effectively cool the machining process, control chip formation, extend tool life, and improve surface smoothness. Stellite 6 has the best comprehensive performance, taking into account both wear resistance and toughness.
Due to poor weldability of cobalt-based alloys like Stellite 6, welding defects such as cracking and delamination of weld layers are common during overlay welding. Controlling interlayer and surface layer welding, preheating temperatures, interpass temperatures, and heat treatment temperatures and times are critical challenges in the overlay welding process. Stellite 6 is often compared with Stellite 21: Stellite 6 is suitable for high-temperature and wear-resistant applications, while Stellite 21 excels in heat and corrosion resistance under high-temperature conditions.
Properties
Properties Table of Stellite 6
| Mechanical Properties | |
|---|---|
| Ultimate Tensile Strength | 700-900 MPa |
| Yield Strength | 400-600 MPa |
| Young's Modulus(Elasticity) | 220 GPa |
| Elongation at Break | 2-20 % |
| Hardness (without heat treament) | 38-44 HRC |
| Density | 8.44 g/cm³ |
| Physical Properties | |
| Corrosion Resistance | Good |
| Magnetism | Non-Magnetic |
| Weldability | Moderate |
| Thermal Properties | |
| Thermal Expansion Coefficient | 12.6 μm/m°C |
| Thermal Conductivity | 16.4 W/m·K |
| Electrical Properties | |
| Electrical Resistivity | 105-110 μΩ*cm |
TECHNOLOGY OVERVIEW
Basic Knowledge of Stellite 6
What is Stellite 6?
Stellite 6 is a cobalt-based alloy typically containing about 27% chromium, 4% molybdenum, and other alloying elements such as nickel and iron. It is renowned for its excellent wear resistance, high hardness, and outstanding high-temperature performance.
Stellite 6 is commonly used in industrial applications requiring long-term wear and corrosion resistance, such as aerospace, petrochemical, and medical equipment industries. It maintains stable mechanical properties and oxidation resistance in high-temperature and harsh environments, making it an ideal choice for manufacturing wear-resistant parts and components for high-temperature operations. However, due to its poor weldability, careful control of welding processes is necessary to avoid defects.
Advantages of Stellite 6
- Excellent Wear Resistance
- High Hardness
- High Temperature Resistance
- Excellent Corrosion Resistance
- Good Mechanical Properties
- High Strength And Toughness
- Excellent Processability
- Oxidation Resistance
Applications of Stellite 6
- Turbine Components
- Custom Valves
- Automotive Parts
- Orthopedic Implants
- Chemical Parts
- Die Casting Molds
- Electronic Precision Parts
- Food Equipment Components
FAQ
Machining Stellite 6 Buying FAQs
Yes, Stellite 6 is commonly used to manufacture various types of hard alloy cutting tools such as milling cutters, drills, lathe tools, and cutting inserts. It exhibits high hardness, effectively resisting wear and extending the tool life. With excellent wear resistance, it maintains sharp cutting edges even under high-strength and high-speed cutting conditions, thereby enhancing machining efficiency. Additionally, it can withstand high temperatures, possesses good toughness, and is less prone to fracture.
Due to its high hardness and wear resistance, Stellite 6 alloy is indeed more challenging to machine compared to typical steels. Machining Stellite 6 alloy requires specialized technical expertise and experience. However, with appropriate machining techniques and equipment, the challenges associated with its machining can be overcome to achieve high-quality machining results.
Both Stellite 6 and Stellite 21 are cobalt-based alloys, but Stellite 6 is harder and more wear-resistant, making it suitable for high-speed cutting tools and molds; while Stellite 21 is tougher and suitable for situations where it needs to withstand impact forces, such as the manufacture of valves and pump impellers.
Stellite 6 is generally harder and more wear-resistant than stainless steel 316, and is suitable for use in high-wear environments, such as the manufacture of wear-resistant parts for mechanical parts. stainless steel 316 is superior to Stellite 6 in corrosion resistance and is suitable for use in corrosive media. Stellite 6 is generally more stable under high temperature and high strength conditions, while stainless steel 316 has good strength and toughness in mechanical applications.
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