Chemical Composition (Weight %)
| Element | Composition Range (%) | Typical Value (%) |
|---|---|---|
| Copper (Cu) | 68.5 – 71.5 | 70.0 |
| Zinc (Zn) | Balance | ~30.0 |
| Lead (Pb) | ≤ 0.07 | 0.05 |
| Iron (Fe) | ≤ 0.05 | 0.03 |
| Other Impurities | ≤ 0.15 total | – |
| Note | This alloy is designated as a Low-Lead Brass. | – |
Physical Properties
| Property | Condition | Value / Description |
|---|---|---|
| Density | – | 8.53 g/cm³ (0.308 lb/in³) |
| Melting Point (Liquidus) | – | 955 °C (1750 °F) |
| Melting Point (Solidus) | – | 915 °C (1680 °F) |
| Electrical Conductivity | Annealed | 28 % IACS (at 20°C) |
| Thermal Conductivity | – | 120 W/(m·K) (at 20°C) |
| Coefficient of Thermal Expansion | 20-300°C | 20.2 × 10⁻⁶ /K |
| Modulus of Elasticity (Young's Modulus) | – | 110 GPa (16 × 10⁶ psi) |
| Magnetic Permeability | – | Essentially non-magnetic (μ ≈ 1.0) |
Mechanical Properties (Typical)
| Condition | Tensile Strength (MPa) | Yield Strength (0.2% Offset, MPa) | Elongation (% in 50 mm) | Rockwell Hardness |
|---|---|---|---|---|
| Annealed (O60) | 325 – 380 | 105 – 170 | ≥ 50 | F 60 – 75 |
| ¼ Hard (H01) | 345 – 415 | 140 – 240 | 40 – 50 | F 75 – 85 |
| ½ Hard (H02) | 380 – 450 | 170 – 290 | 25 – 40 | F 80 – 90 |
| Hard (H04) | 415 – 485 | 240 – 345 | 10 – 25 | B 55 – 75 |
| Spring (H08) | 460 – 530 | 380 – 450 | 4 – 12 | B 80 – 90 |
| Extra Hard (H10) | 485 – 550 | 415 – 485 | 3 – 10 | B 85 – 95 |
Key Characteristics & Advantages
Excellent Cold Workability: The standard for severe deep drawing, stamping, bending, and spinning.
Good Corrosion Resistance: Resists atmospheric corrosion, fresh water, and many chemicals. Susceptible to dezincification in specific environments; inhibited grades are available.
High Ductility: Especially in the annealed condition.
Attractive Golden Color: Suitable for decorative applications.
Non-Sparking: Under specific conditions, making it suitable for some safety tools.
Good Electrical & Thermal Conductivity: Suitable for many electrical and heat exchanger applications.
Machinability: Rated at 20% of free-cutting brass (C36000). Acceptable but requires proper tooling and technique.
Fabrication & Processing Notes
Heat Treatment: Can be stress-relief annealed at 260-370°C (500-700°F).
Hot Working: Performs well in the range of 650-825°C (1200-1500°F).
Cold Working: Responds exceptionally well to all cold working processes.
Joining: Excellent for brazing and soldering. Good for silver alloy brazing and welding (both gas and arc).
Cleaning/Pickling: Standard copper alloy solutions (e.g., dilute sulfuric acid) are effective.
Standard Specifications & Equivalents
| Standard | Designation |
|---|---|
| UNS | C26000 |
| ASTM | B36, B134, B135 |
| SAE | CA260 |
| CDA (Copper Dev. Assoc.) | 260 |
| EN (European) | CW508L (CuZn30) |
| ISO | CuZn30 |
| JIS (Japanese) | C2600 |
| China GB | H68 |
Typical Applications
Ammunition Components: Cartridge cases (primary use).
Electrical Components: Terminals, connectors, sockets, switch parts.
Heat Exchangers & Radiators: Tubes, cores, fins.
Architectural & Decorative: Door/window hardware, trim, nameplates, decorative trim.
General Mechanical: Stampings, fasteners, plumbing fittings (non-pressurized), low-stress springs, musical instruments.
Beacon Reflectors & Lamp Components: Due to its excellent reflectivity.
Our factory
Our factory specializes in the production and manufacturing of high-quality copper products. We operate a comprehensive, end-to-end production line equipped with advanced continuous casting and rolling mills, precision drawing machines, high-speed rolling mills, and automated heat treatment systems. We professionally produce a wide range of copper tubes, plates, bars, wires, and foils. A strict quality inspection system is implemented throughout the entire process, from raw material intake to finished product delivery. Supported by precision instruments such as spectrometers, metallographic microscopes, tensile testing machines, eddy current flaw detectors, and laser dimension gauges, we ensure that our products fully comply with international and domestic standards-including ASTM, EN, JIS, and GB-in terms of chemical composition, mechanical properties, dimensional accuracy, and surface quality. We are committed to providing global customers with stable, reliable, and fully-specified copper material solutions.
copper product packaging
Our products are packaged using professional, customized industrial packaging solutions to ensure they remain intact during long-distance transportation and multiple handlings. For long products such as copper tubes and bars, we use sturdy waterproof wooden crates or metal-frame boxes for secure fixing and protection. Copper plates and foils are individually wrapped with anti-rust paper, then packed into steel-edged boxes or on pallets with reinforced hard corners. Copper wires are wound with moisture-proof film and neatly coiled onto custom-designed reels or placed in wooden cases. All packaging is clearly marked according to customer requirements with shipping marks, specifications, batch numbers, and handling symbols. Desiccants can also be placed inside the packages when needed, providing complete protection against rust, moisture, and impact throughout the entire journey from production to the destination port.
