CuZn33 Brass

Designation

CuZn33 (30% Zinc Brass)

• International Standards: CW509L (EN 12163), Cz107, ZCuZn33Pb2 (cast leaded brass variant).

• Chinese Standards: GB/T 5231 (H68), GB/T 1176-2013 (cast leaded brass).

Key Features

1. High Plasticity & Strength: Best plasticity among brasses, ideal for deep drawing.

2. Machinability: Suitable for forging, welding, and cutting.

3. Corrosion Resistance: Stable in general environments but prone to cracking in ammonia.

4. Conductivity: 27% IACS electrical conductivity, 116–142 W/(m·K) thermal conductivity.

Product Forms & Dimensions

Form	Dimensions
Sheet	Thickness: 0.5–50mm; Width: 100–1500mm
Rod	Diameter: Φ5–300mm; Length: 1000–6000mm
Tube	OD: 5–150mm; Wall Thickness: 0.5–10mm
Wire	Diameter: 1.0–20mm; Custom lengths
Castings	Customized (Max weight: 50kg)

Chemical Composition (%)

Element	Cu	Zn	Pb	Fe	Others
Content	63–67	Balance	≤0.05	≤0.05	≤0.3
Note: Leaded variant (ZCuZn33Pb2) contains 1.0–3.0% Pb.

Physical Properties

Property	Value
Density	8.53 g/cm³
Melting Point	900–932°C
Thermal Conductivity	116–142 W/(m·K)
Electrical Conductivity	27% IACS

Mechanical Properties

Condition	Tensile Strength (MPa)	Yield Strength (MPa)	Elongation (%)	Hardness (HV)
Annealed	300–350	120–150	≥40	80–100
Cold-Rolled	410–650	250–450	≥8	150–180
As-Cast	≥180	≥70	≥12	≥490 (HBS)

Core Advantages

1. Deep-Drawing Capability: Ideal for cartridge cases and radiators.

2. Cost-Effectiveness: Lower cost due to high zinc content.

3. Versatility: Tailorable with Pb/Si for specific applications.

Applications

• Manufacturing: Radiator shells, valves, cartridge cases.

• Construction: Decorative hardware, lighting fixtures.

• Casting: Water equipment housings (leaded variants).

Processing Guidelines

1. Cold Working: Anneal at 600–650°C for soft state.

2. Casting: Melt at 1100–1150°C with charcoal protection.

3. Welding: Use silver-based brazing to avoid cracks.

Key Application Scenarios

Industry	Typical Components	Requirements
Military	Cartridge cases	High plasticity, low cost
Architecture	Bathroom fittings	Aesthetic finish

FAQ

Q1: CuZn33 vs. CuZn30?

A1: CuZn33 has higher Zn (33%) for deep drawing; CuZn30 focuses on casting.

Q2: How to prevent dezincification?

A2: Apply protective coatings or avoid chlorine/sulfur environments.

Q3: Is ZCuZn33Pb2 RoHS-compliant?

A3: Standard variants exceed 0.1% Pb; low-Pb versions require customization.

Standards

Standard	Scope
EN 12163	Rod/wire technical conditions
GB/T 5231	Chinese brass classifications
ASTM B584	Copper alloy castings

Note: Actual parameters may vary depending on manufacturing processes.