Free Machining Brass C36000 Brass Plate

C36000, commonly known as Free Machining Brass, is a widely used copper alloy that combines copper, zinc, and a small percentage of lead, typically between 2.5% and 3.7%. This specific composition grants it exceptional machinability, earning it a machinability rating of 100%, which makes it the benchmark for comparing other copper alloys

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solid lubricant C36000 Brass Plate

C36000 Free-Cutting Brass plate

Overview of C36000 Free-Cutting Brass Plate

C36000 Free-Cutting Brass Plate is a highly sought-after alloy known for its exceptional machinability and versatility, making it a preferred choice for various applications across multiple industries.

C36000 Free-Cutting Brass Plate is distinguished by its machinability rating of 100, the industry benchmark for copper alloys. This high rating means that the alloy can be machined at high speeds with ease, making it particularly well-suited for automatic screw machining. The plate’s composition encourages the formation of short, broken chips during machining, which not only increases efficiency but also minimizes tool wear.

C36000 Free-Cutting Brass Plate

Performance of C36000 Free-Cutting Brass in Extreme Temperatures

High Temperature Performance

  • Creep Strength: C36000 brass exhibits excellent creep strength at elevated temperatures. After being exposed to 100°C for 100 hours, its creep strength remains on par with its strength at normal temperatures. Even at 140°C, it retains 80% of its room temperature strength.
  • Stress-Relaxation: The alloy outperforms others in stress-relaxation above 60°C, meaning it maintains its mechanical properties more effectively at high temperatures.
  • Melting Point: With a melting point range of 1630-1650°F (888-899°C), C36000 brass can endure very high temperatures before it begins to melt.

Low Temperature Performance

  • Thermal Expansion: C36000 has a coefficient of thermal expansion of 11.4 x 10^-6 per °F (20.5 x 10^-6 per °C) from 68-572°F (20-300°C), indicating strong dimensional stability even in colder environments.
  • Modulus of Elasticity: The alloy maintains a high modulus of elasticity at low temperatures, ensuring it remains stiff and strong.
  • Ductility: Unlike some metals, C36000 brass does not become brittle in cold conditions, retaining its ductility even in freezing environments.

C36000 Brass with Graphite

Incorporation of Graphite in C36000 Brass

Recent innovations have focused on integrating graphite into lead-free versions of C36000 brass. This approach seeks to retain the beneficial characteristics of traditional C36000 brass while addressing environmental and health concerns associated with lead. The addition of graphite enhances machinability and wear resistance, making this modified brass ideal for applications that require lead-free materials.

Manufacturing and Processing

C36000 brass is typically produced through an extrusion process, where a heated billet is extruded to form smaller diameters. However, for larger components that exceed the standard extrusion limits (around 4 to 4.5 inches in diameter), alternatives such as cast and turned C36000 brass or substitution with other alloys like C93200 bearing bronze are considered. These alternatives maintain similar mechanical properties while accommodating larger dimensions.

Recommended Machining Techniques for C36000 Brass with Graphite
  • High-Speed Machining: C36000 brass is optimized for high-speed machining, making it well-suited for CNC machines. Using high spindle speeds can enhance productivity and efficiency.
  • Appropriate Tooling: Tools made from high-speed steel (HSS) or carbide are recommended. The presence of graphite may require adjustments in tool geometry to match the material’s properties and ensure optimal cutting performance.
  • Coolant Use: Employing cutting fluids helps manage heat and prolong tool life. The choice of coolant should be tailored to the graphite content and the specific application.
  • Feed Rate Adjustments: Proper feed rate adjustments are crucial. Higher feed rates can reduce tool wear and improve surface finish when machining C36000 brass.
  • Chip Management: Effective chip removal is essential, especially during high-speed machining. Clearing chips from the cutting area prevents re-cutting and improves surface quality.
  • Surface Finish Considerations: For applications requiring specific surface finishes, fine-tuning machining parameters such as speed and feed is necessary to achieve the desired results.

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