CuZn31Si1 Copper

Designation

• Name: Silicon Brass CuZn31Si1

• International Designation: CW708R (German Standard), DIN 2.0490

• Standards: DIN 17660, EN 12163, EN 12449.

Key Features

1. Excellent Machinability: Easy to cut, high flatness, suitable for hot/cold forming.

2. High Strength & Creep Resistance: Silicon enhances stress relaxation resistance at high temperatures.

3. Corrosion & Wear Resistance: Performs well in atmospheric, freshwater, seawater, and dilute sulfuric acid environments.

4. Conductivity: Ideal for electrical and thermal components.

5. Non-Magnetic: Suitable for anti-magnetic applications.

Common Forms & Dimensions

Form	Dimensions
Round Bar	Diameter: Φ3.0mm–315mm
Plate	Thickness: 1.0–200mm
Tube	Seamless tubes per EN 12449
Wire	Diameter: 0.1mm–4.0mm
Forged Parts	Custom sizes available.

Chemical Composition (wt%)

Element	Cu	Zn	Si	Pb	Fe	Ni	Impurities
Range	66–70	Bal.	0.7–1.3	≤0.8	≤0.4	≤0.5	≤0.5
Data based on DIN 17660 .

Physical Properties

Property	Value/Description
Density	8.4 g/cm³
Thermal Conductivity	High (copper-based)
Magnetism	Non-magnetic
Electrical Conductivity	Complies with G28357 (IACS reference).

Mechanical Properties

Property	Range/Typical Value
Tensile Strength (Rm)	460–600 MPa
Yield Strength (Rp0.2)	250–370 MPa
Elongation (A)	12–30%
Brinell Hardness (HB)	115–170
Note: Properties vary with temper (e.g., soft O, hard H).

Core Advantages

• Versatile Processing: Supports welding, brazing, machining, and stamping.

• High-Temperature Stability: Silicon reduces stress relaxation in cold-worked parts.

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

Applications

• Electronics: Terminals, heat sinks, connectors.

• Architecture & Decoration: Premium handles, decorative parts.

• Industrial Piping: Corrosion-resistant valves, fittings.

• Mechanical Components: Springs, bushings, wear-resistant liners.

Processing Guidelines

1. Machining: Use sharp tools to avoid adhesion.

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

3. Surface Treatment: Nickel/chrome plating for enhanced corrosion resistance.

4. Cold Working: Annealing recommended to relieve stress.

FAQs of CuZn31Si1 Material

Q1: How to distinguish CuZn31Si1 from bronze?

A: Bronze contains tin/aluminum (grayish), while CuZn31Si1 is brass (yellow) with silicon.

Q2: Suitable for seawater use?

A: Yes, but surface passivation is advised for long-term exposure.

Q3: Performance under high temperatures?

A: Stable up to 200°C due to silicon’s creep resistance.

Standards Reference

· DIN 17660: Chemical and processing standards.

· EN 12163/12449: Rod and tube specifications.

· GB/T: Chinese national standards for mechanical properties.