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

CuZn31Si1 Copper

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

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.


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