CuZn20 Brass

Designation

CuZn20 (Low Zinc Brass)

International Standards: CW503L (EN 12164), 2.0250 (DIN 17660), H80 (GB/T 5231).

Key Features

1. Balanced Composition: Cu 79–81%, Zn balance, optimized strength and ductility.

2. Workability: Excellent for cold/hot forming, stamping, and welding.

3. Corrosion Resistance: Stable in atmospheric and freshwater environments.

4. Conductivity: Electrical conductivity 32% IACS, thermal conductivity 142 W/(m·K).

5. Eco-Friendly: Lead ≤0.05%, compliant with RoHS.

Product Forms & Dimensions

Form	Dimensions
Sheet	Thickness: 0.2–50mm; Width: 100–1500mm
Strip	Thickness: 0.1–3mm; Width: 10–600mm
Rod	Diameter: Φ5–300mm; Length: 1000–6000mm
Tube	OD: 3–150mm; Wall Thickness: 0.3–8mm
Wire	Diameter: 0.1–20mm; Custom lengths

Chemical Composition (%)

Element	Cu	Zn	Pb	Fe	Total Impurities
Content	79.0–81.0	Balance	≤0.05	≤0.05	≤0.3

Physical Properties

Property	Value
Density	8.7 g/cm³
Melting Point	1030–1050°C
Thermal Conductivity	142 W/(m·K)
Electrical Conductivity	32% IACS
Resistivity	3.5×10⁻⁸ Ω·m
Thermal Expansion	18.8×10⁻⁶/K（20–300°C）

Mechanical Properties

Condition	Tensile Strength (MPa)	Yield Strength (MPa)	Elongation (%)	Hardness (HV)
Annealed	270–320	150	≥48	55–85
Half-Hard	320–400	200	≥28	85–120
Hard	400–480	320	≥12	120–155

Core Advantages

1. Strength-Ductility Balance: Tensile strength up to 480 MPa with elongation ≥12%.

2. Environmental Resistance: Suitable for marine and humid environments.

3. Manufacturing Flexibility: Compatible with rolling, welding, and machining.

Applications

• Mechanical: Bolts, springs, washers (high strength).

• Construction: Corrugated pipes, door handles (aesthetic finish).

• Electrical: Heat sinks, connectors (thermal/electrical conductivity).

Processing Guidelines

1. Cold Working: Anneal at 450–600°C (N₂ protection).

2. Hot Working: Rolling temperature 680–750°C.

3. Welding: Use TIG welding or silver-based brazing.

Key Application Scenarios

Industry	Typical Components	Requirements
Shipbuilding	Seawater condenser tubes	Corrosion resistance, strength
Architecture	Decorative hardware	Surface finish, oxidation resistance
Power Equipment	Heat sinks	Thermal conductivity

FAQ

Q1: CuZn20 vs. CuZn30?

A1: CuZn30 has higher Zn (30%) for casting, while CuZn20 excels in forming.

Q2: How to prevent dezincification?

A2: Avoid sulfur-rich environments or apply protective coatings.

Q3: Why lower conductivity than pure copper?

A3: Zinc increases lattice distortion, reducing electron mobility.

Standards

Standard	Scope
EN 1652	Sheet/rod technical conditions
DIN 17660	Chemical & mechanical specs
GB/T 5231	Chinese brass classifications
ASTM B134	U.S. specifications for wire

Note: Actual parameters may vary depending on manufacturing processes.