CuZn15 Brass

Designation

CuZn15 (15% Zinc Brass)

International Standards: CW502L (EN 12164), 2.0240 (DIN 1708), H85 (GB/T 5231).

Key Features

1. Balanced Composition: Zn 15%, Cu ≥84.5%, optimized strength and corrosion resistance.

2. Workability: Excellent for stamping, forging, and welding.

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

4. Conductivity: Electrical conductivity ≥48.0 Ω*mm²/m (annealed).

5. Aesthetic Appeal: Golden surface finish after polishing.

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
Wire	Diameter: 0.1–20mm; Custom lengths
Tube	OD: 3–150mm; Wall Thickness: 0.3–8mm

Chemical Composition (%)

Element	Cu	Zn	Pb	Fe	Total Impurities
Content	84.5–86.5	Balance	≤0.03	≤0.05	≤0.2

Physical Properties

Property	Value
Density	8.75 g/cm³
Melting Point	1030–1050°C
Thermal Conductivity	110–115 W/(m·K)
Electrical Conductivity	48.0–50.0 Ω*mm²/m
Resistivity	3.5×10⁻⁸ Ω·m
Thermal Expansion	20.5×10⁻⁶/K（20–300°C）

Mechanical Properties

Condition	Tensile Strength (MPa)	Yield Strength (MPa)	Elongation (%)	Hardness (HV)
Annealed	270–320	120–180	≥35	70–90
Half-Hard	380–450	280–350	≥12	110–140
Hard	500–600	450–500	≥4	150–180

Core Advantages

1. Strength-Ductility Balance: 20% higher strength than CuZn10 with retained ductility.

2. Stress Corrosion Resistance: Lower dezincification risk vs. high-zinc brasses.

3. Cost Efficiency: 25–30% lower cost than pure copper.

Applications

• Electronics: Connector terminals, relay springs.

• Automotive: Fuel fittings, sensor housings.

• Architecture: Door locks, bathroom fixtures.

• Mechanical: Spring washers, bearing cages.

Processing Guidelines

1. Cold Working: Anneal at 400–550°C (N₂ protection).

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

3. Welding: Use BAg-5 brazing or TIG welding.

4. Surface Treatment: Acid pickling before plating.

Key Application Scenarios

Industry	Typical Components	Requirements
Consumer Electronics	USB-C contacts	High elasticity, fatigue resistance
Automotive	Turbocharger oil fittings	Corrosion resistance, sealing
Architecture	High-end door lock cores	Wear resistance, aesthetics

FAQ

Q1: CuZn 15 vs. CuZn 30?

A1: CuZn30 has higher Zn (30%) for casting, while CuZn15 excels in forming.

Q2: Why lower conductivity than CuZn10?

A2: Increased zinc content disrupts electron flow.

Q3: How to prevent cracking during forming?

A3: Limit cold work deformation to ≤60% and anneal properly.

Standards

Standard	Scope
EN 12164	Rod/wire technical conditions
GB/T 5231	Chinese brass classifications
DIN 17660	Chemical & mechanical specs
ASTM B134	U.S. specifications for wire

Note: Actual parameters may vary depending on manufacturing processes.