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C36000 Lead Brass Alloy - Premium Quality Free-Cutting Brass from China Suppliers & Factory
1. Core chemical composition (UNS standard)
| Element | Content Range (%) |
| Copper (Cu) | 60.0–63.0 |
| Lead (Pb) | 2.5–3.7 |
| Zinc (Zn) | Excess |
| Iron (Fe) | ≤0.35 |
| Total impurity content | ≤0.5 |
2. Physical properties (typical values)
| Performance indicators | Typical values |
| Density | 8.50 g/cm³ |
| Melting point | 885–900 ℃ |
| Thermal conductivity | 115 W/(m·K) |
| Electrical conductivity | 26 % IACS (annealed state) |
| Elastic modulus | 105–115 GPa |
3. Main Characteristics
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Excellent machinability, superior to ordinary brass
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Excellent chip removal, does not get stuck on the blade, suitable for high-speed automatic lathes and CNC
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Good cold working performance, capable of slight bending and stamping
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Both electrical conductivity and heat conductivity are relatively good, suitable for terminals or heat dissipation components
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High yield rate, easy for both cold and hot processing
4. Application Fields
Automotive Industry
Fuel system joints, fuel injector housings, nuts and bolts
Electrical and Electronic
Connector terminals, connectors, heat sinks, terminal blocks
Precision Machinery and Instruments
Gears, instrument joints, watch movement parts
Hardware and Consumer Electronics
Small hardware components, electrical enclosures
Water Supply and Valves
Valve bodies, valve cores, valve stems, pipe joints, faucet accessories
Frequently Asked Questions (FAQ)
Q1: What is the UNS designation of this free-cutting brass?
This alloy matches the UNS C36000 standard, which is widely recognized as the industry standard for free-cutting brass components due to its high lead content.
Q2: Why is lead (Pb) added to this brass alloy?
Lead is added (typically 2.5%–3.7%) to act as an internal lubricant and chip breaker. This ensures rapid chip removal and significantly extends tool life during high-speed machining.
Q3: Can this material be easily welded?
Generally, welding is not recommended for high-lead brass alloys because the lead content can cause cracking and toxic fumes. Instead, soldering or brazing is preferred for joining.
Q4: Is C36000 brass corrosion resistant?
Yes, it offers excellent corrosion resistance in non-acidic environments, making it highly suitable for water supply fittings, plumbing valves, and outdoor hardware.
Q5: How does the electrical conductivity of this brass compare to pure copper?
This brass alloy has an electrical conductivity of approximately 26% IACS (International Annealed Copper Standard). While lower than pure copper, it provides a balanced mix of conductivity and mechanical strength for terminals.
Q6: What makes this alloy ideal for CNC and automatic lathes?
Its optimal composition guarantees small, easily clearable chips that do not wrap around the tool. This prevents machine clogging and allows for continuous, high-speed automated production.