CuZn28Sn1 Brass

Grade Name

International Designations:

• DIN: CuZn28Sn1 (2.0470)

• EN: CW706R

• China: GB/T 14954-1994

Product Features

• Corrosion Resistance: Excellent in marine and chemical environments.

• High Strength: Tensile strength ≥365 MPa, yield strength ≥525 MPa.

• Machinability: Suitable for cold/hot forming and welding.

• Thermal & Electrical Conductivity: 28% IACS, 120 W/(m·K).

Common Forms & Dimensions

Form	Dimensions
Sheet	Hot-rolled: 4–50 mm, Cold-rolled: 0.2–10 mm, Width: 305–600 mm
Bar	Diameter: Φ5–Φ80 mm (Drawn), Φ30–Φ120 mm (Extruded)
Tube	OD: Φ10–Φ200 mm, Wall: 1–20 mm
Wire	Diameter: Φ0.05–Φ2.0 mm (Cold-drawn)

Chemical Composition (% wt.)

Element	Cu	Zn	Sn	Pb (≤)	As (≤)	Fe (≤)	Others (≤)
Content	70–72.5	Bal.	0.9–1.3	0.07	0.035	0.07	0.3

Physical Properties

Property	Value
Density	8.5 g/cm³
Elastic Modulus	110 GPa
Thermal Expansion	13×10⁻⁶/K (20°C)
Thermal Conductivity	120 W/(m·K)
Resistivity	0.31 Ω·mm²/m

Mechanical Properties (By Condition)

Condition	Tensile Strength (MPa)	Yield Strength (MPa)	Elongation (%)	Hardness (HB)
Soft (Annealed)	≥365	≥525	≥23	≤100
Hard (Cold-worked)	≥500	≥350	≥5	120–140

Key Advantages

• Marine Durability: Ideal for seawater systems.

• Cost Efficiency: Reduces machining costs with high formability.

• Multi-Functionality: Balances strength, conductivity, and wear resistance.

Applications

• Marine Engineering: Ship valves, condenser tubes.

• Precision Instruments: Watch components, optical devices.

• Chemical Systems: Corrosion-resistant pipelines.

Processing Guidelines

• Hot Working: 760–800°C recommended.

• Cold Working: Annealing at 550–650°C required.

• Welding: Use protective gas (e.g., argon).

• Surface Treatment: Ni/Cr plating for marine use.

Key Application Scenarios

• Shipbuilding: Seawater pumps, pipeline fittings.

• Electronics: Connectors, terminals.

FAQ

Q1: Is it RoHS compliant?

A: Contains trace lead (≤0.07%), compliant with exemptions for industrial use.

Q2: Alternatives for lead-free applications?

A: Use CW614N (lead-free brass) for potable water systems.

Q3: How to enhance seawater resistance?

A: Apply protective coatings and conduct regular inspections.

Standards Reference

• International: DIN 17660-1983, EN 12451 (CW706R), ASTM B505.

• China: GB/T 14954-1994.