CuZn20Al2 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.