CuZn30 Brass

Designation

CuZn30 (30% Zinc Brass)

International Standards: CW505L (EN 12164), 2.0265 (DIN 17660), H68 (GB/T 5231)

Key Features

1. High Zinc Content: Zn 30%, Cu 60–63%, optimized for strength and casting.

2. Workability: Suitable for casting and hot rolling; cold working requires controlled deformation.

3. Corrosion Resistance: Stable in atmospheric environments; prone to dezincification in chlorine/sulfur.

4. Conductivity: Electrical conductivity 28% IACS, thermal conductivity ≥100 W/(m·K).

5. Cost Efficiency: Lower material cost due to high zinc content.

Product Forms & Dimensions

Form	Dimensions
Sheet	Thickness: 0.5–50mm; Width: 100–1500mm
Rod	Diameter: Φ10–300mm; Length: 1000–6000mm
Tube	OD: 5–150mm; Wall Thickness: 0.5–10mm
Castings	Customized (Max weight: 50kg)
Wire	Diameter: 1.0–20mm; Custom lengths

CuZn30 Chemical Composition (%)

Element	Cu	Zn	Pb	Fe	Total Impurities
Content	60.0–63.0	Balance	≤0.1	≤0.1	≤0.5

CuZn30 Data Sheet

Physical Properties

Property	Value
Density	8.5 g/cm³
Melting Point	900–925°C
Thermal Conductivity	100–110 W/(m·K)
Electrical Conductivity	28% IACS
Resistivity	6.0×10⁻⁸ Ω·m
Thermal Expansion	21.2×10⁻⁶/K（20–300°C）

Mechanical Properties

Condition	Tensile Strength (MPa)	Yield Strength (MPa)	Elongation (%)	Hardness (HV)
As-Cast	300–350	–	10–15	80–100
Hot-Rolled	400–500	250–300	≥20	100–130
Cold-Rolled	550–650	450–500	≥8	150–180

Core Advantages

1. High Strength & Wear Resistance: Cold-rolled tensile strength up to 650 MPa.

2. Superior Castability: Ideal for intricate castings (e.g., faucet bodies).

3. Economic Efficiency: 15–20% lower cost than low-zinc brasses.

Applications

• Hardware: Locks, valve cores (casting + polishing).

• Mechanical: Gears, bearing cages.

• Decoration: Antique-style fixtures, lamp frames.

• Military: Training cartridge cases (non-combat).

Processing Guidelines

1. Casting: Melt at 1100–1150°C with charcoal cover.

2. Cold Working: Anneal at 450–550°C (protective atmosphere).

3. Welding: Use BAg-7 brazing; avoid fusion welding.

4. Surface Protection: Nickel/chrome plating or passivation.

Key Application Scenarios

Industry	Typical Components	Requirements
Plumbing	Faucet bodies, showerheads	Casting precision, corrosion resistance
Machinery	Gear blanks, bushings	High strength, wear resistance
Military	Training cartridge cases	Cost-effectiveness, machinability

FAQ of CuZn30 Material

Q1: Cu Zn 30 vs. low-zinc brass (e.g., Cu Zn 20)?

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

Q2: How to prevent dezincification?

A2: Apply protective coatings (Ni/Cr) or avoid chlorine/sulfur exposure.

Q3: Why low conductivity?

A3: High zinc content disrupts electron flow, reducing conductivity to 28% IACS.

Standards

Standard	Scope
EN 12164	Rod/wire technical conditions
GB/T 5231	Chinese brass classifications
DIN 17660	Chemical & mechanical specs
ASTM B584	Copper alloy castings

Note: Actual parameters may vary depending on manufacturing processes.