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

CuZn20Al2 Copper

Copper

Designation

  • Name: Aluminum Brass CuZn20Al2

  • International Designation: CW702N (European Standard), HAl77-2, C68700, DIN 2.0460

  • Standards: ISO 426/1-1983, DIN 17660, EN 12163.


Key Features

1. High Strength & Wear Resistance: Aluminum enhances tensile strength and wear resistance.

2. Corrosion Resistance: Excellent in seawater, humid, and non-oxidizing acid environments.

3. Machinability: Suitable for cold/hot forming, cutting, and forging.

4. Conductivity: Ideal for thermal and electrical components.

5. Lightweight Design: Balances strength and weight for aerospace applications.


Common Forms & Dimensions

Form

Dimensions

Round Bar

Diameter: Φ3.0mm–315mm

Plate

Thickness: 1.0–200mm

Tube

Seamless tubes per EN 12449 (Wall ≤10mm)

Wire

Diameter: 0.1mm–4.0mm

Forged Parts

Custom sizes (e.g., bushings, gears)

Note: Customizable per requirements.


Chemical Composition (wt%)

Element

Cu

Zn

Al

Pb

Fe

As

Impurities

Range

76–79

Bal.

1.8–2.3

≤0.07

≤0.07

0.02–0.06

≤0.1

Data based on DIN 17660 & ISO 426/1.


Physical Properties

Property

Value/Description

Density

8.3 g/cm³

Thermal Conductivity

23.3 W/m·°C (at 492°C)

Elastic Modulus

919 GPa (at 492°C)

Electrical Resistivity

0.22 Ω mm²/m (at 12°C)

Conductivity

~90% IACS

Note: Values from multiple sources.


Mechanical Properties

Property

Range/Typical Value

Tensile Strength (Rm)

330–490 MPa (varies by temper)

Yield Strength (Rp0.2)

140–250 MPa

Elongation (A)

30–50%

Brinell Hardness (HB)

80–170

Note: Properties depend on temper (e.g., soft O, hard HA).


Core Advantages

  • Versatility: Adaptable to welding, forging, and machining.

  • High-Temperature Stability: Stable up to 200°C.

  • Eco-Friendly: ROHS-compliant, lead-free options available.


Applications

  • Marine Engineering: Anchors, seawater valves, pump parts.

  • Electronics: Terminals, heat sinks, connectors.

  • Automotive: Engine components, radiators, bearings.

  • Chemical Industry: Reactors, corrosion-resistant pipes.


Processing Guidelines

1. Machining: Use sharp tools with coolant to prevent adhesion.

2. Welding: Prefer TIG or brazing to avoid oxidation.

3. Heat Treatment: Anneal at 520–650°C to relieve stress.

4. Surface Treatment: Nickel/chrome plating for marine use.


FAQs

Q1: How to distinguish CuZn20Al2 from regular brass?

A: Regular brass is zinc-based, while CuZn20Al2 contains aluminum (1.8–2.3%) for higher strength.


Q2: Suitable for ammonia environments?

A: Not recommended due to stress corrosion risks.


Q3: High-temperature performance?

A: Stable ≤200°C; evaluate beyond this limit.


Standards Reference

  • DIN 17660: Chemical and processing standards.

  • ISO 426/1-1983: International specifications.

  • EN 12163/12449: Rod and tube dimensions.


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