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Ningbo Jintian Copper (Group) Co., Ltd.
Ningbo Jintian Copper (Group) Co., Ltd.
Code
Brass

CuZn20 Brass

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.


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