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

CuZn28Sn1 Brass

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.


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