CuZn5 Brass

Designation

CuZn5 (Common Brass)

International Standards: CW500L (EN), 2.0220 (DIN 1708), H96 (GB/T 5231).

Key Features

1. High Purity & Workability: Cu ≥95%, excellent cold/hot forming, welding, and forging performance.

2. Conductivity & Thermal Conductivity: Electrical conductivity ≥57.0 Ω*mm²/m (annealed), thermal conductivity 385 W/(m·K).

3. Corrosion Resistance: Stable in atmospheric, freshwater, and mild chemical environments.

4. Moderate Strength: Higher than pure copper but lower than other brasses, with good plasticity.

Product Forms & Dimensions

Form	Dimensions
Rod	Diameter: Φ4–600mm; Length: 1000–5000mm
Sheet	Thickness: 0.2–60mm; Width: 500–2000mm
Tube	OD: 5–200mm; Wall Thickness: 0.5–10mm
Wire	Diameter: 0.5–25mm; Custom lengths
Foil	Thickness: 0.005–0.5mm; Width: 10–500mm
Custom profiles available (e.g., flanges, lead frames).

Chemical Composition (%)

Element	Cu	Zn	Pb	Fe	Total Impurities
Content	94.0–96.0	Balance	≤0.05	≤0.05	≤0.1
Note: Cu content varies by standard (94–96% in DIN 17660, ≥95% in GB).

Physical Properties

Property	Value
Density	8.9 g/cm³
Melting Point	1083°C
Thermal Conductivity	385 W/(m·K)
Electrical Conductivity	57.0–58.0 Ω*mm²/m
Resistivity	1.724×10⁻⁸ Ω·m
Thermal Expansion	17.7×10⁻⁶/K（20–100°C）.

Mechanical Properties

Condition	Tensile Strength (MPa)	Yield Strength (MPa)	Elongation (%)	Hardness (HV)
Annealed	230–280	130	≥45	45–75
Half-Hard	270–350	200	≥19	75–110
Hard	340	280	≥8	110
Data based on EN 1652 and DIN 17672-1.

Core Advantages

1. Hydrogen Embrittlement Resistance: O ≤0.03% prevents cracks in H₂ environments.

2. Precision Machining: Fine-grained structure minimizes deformation.

3. Versatility: Balances conductivity, thermal performance, and corrosion resistance.

Applications

• Electronics: Connectors, wires, cable sheaths (high conductivity).

• Mechanical Parts: Gears, bearings, springs (moderate strength).

• Construction: Water pipes, radiators (corrosion resistance).

• Art & Jewelry: Decorative items (excellent surface finish).

Processing Guidelines

1. Cold Working: Anneal at 520–650°C (under protective atmosphere).

2. Hot Working: Temperature range 750–830°C, final rolling ≥600°C.

3. Welding: Use silver-based filler or TIG welding; avoid reducing atmospheres.

Key Application Scenarios

Industry	Typical Components	Requirements
Power Transmission	HV cable conductors	High current capacity, low resistance
Vacuum Devices	Magnetron anodes	Low gas emission, high-temperature brazing
Mold Manufacturing	Stamping dies	High surface precision, fatigue resistance

FAQ

Q1: Difference between CuZn5 and pure copper?

A1: CuZn5 has higher strength (≥230 MPa) and better corrosion resistance due to zinc, but lower conductivity.

Q2: How to prevent hydrogen embrittlement?

A2: Control oxygen content ≤0.03% and avoid high-temperature hydrogen environments.

Q3: Why does conductivity vary?

A3: Conductivity decreases with cold working (e.g., 58.0 Ωmm²/m in annealed vs. 57.0 Ωmm²/m in hard state).

Standards

Standard	Scope
GB/T 5231	Chinese brass classifications
DIN 17660	German chemical & mechanical specs
EN 1652	European sheet/rod technical conditions
ASTM B152	U.S. specifications for sheet/strip

Note: Actual parameters may vary depending on manufacturing processes.