Copper is renowned for its excellent electrical conductivity, corrosion resistance, and ductility. However, not all copper is created equal when it comes to machining. In this blog post, we will explore the top 5 copper alloys that offer the best balance of machinability, mechanical properties, and cost-effectiveness for a wide range of applications.
1. C11000 Electrolytic Tough Pitch (ETP) Copper
C11000 ETP Copper is the most commonly used copper alloy for general-purpose electrical applications. With a purity level of 99.9%, it offers excellent electrical and thermal conductivity. Its machinability rating is around 20%, making it suitable for simple machining operations and forming processes.
Applications:Electrical wiring, busbars, heat exchangers, and transformer windings.
2. C14500 Tellurium Copper
C14500 Tellurium Copper, also known as free-machining copper, is an alloy that contains small amounts of tellurium. This addition significantly improves its machinability, with a rating of around 85%. It retains good electrical conductivity, making it ideal for applications requiring intricate machining without compromising on electrical performance.
Applications:Electrical connectors, switchgear components, and intricate parts for the electronics industry.
3. C17200 Beryllium Copper
C17200 Beryllium Copper is a high-strength, high-conductivity copper alloy that contains around 1.8% beryllium. This alloy offers excellent machinability, with a rating of around 50%. It also has outstanding mechanical properties, including high fatigue strength and wear resistance.
Applications:Aerospace components, electrical contacts, and non-sparking tools for hazardous environments.
4. C18200 Chromium Copper
C18200 Chromium Copper is a heat-treatable copper alloy that contains around 1% chromium. This alloy offers good machinability, with a rating of around 40%. It has high strength, excellent wear resistance, and good electrical conductivity, making it an ideal choice for applications that require both mechanical strength and electrical performance.
Applications:Resistance welding electrodes, electrical contacts, and heavy-duty electrical components.
5. C93200 Bearing Bronze
C93200 Bearing Bronze, also known as SAE 660, is a popular alloy for bearings and bushings. It contains 83% copper, 7% tin, and 7% lead, with the remaining elements being zinc and other trace elements. This alloy offers good machinability, with a rating of around 70%. It has excellent wear resistance and is suitable for applications that require low friction and long-lasting performance.
Applications:Bearings, bushings, and wear plates in heavy machinery and equipment.
In conclusion, the best copper alloy for machining depends on the specific requirements of your application. By selecting the right alloy, you can unlock the full potential of copper and achieve the perfect balance of machinability, mechanical properties, and cost-effectiveness.
