Brass Alloys - Brass CZ131 Properties, Fabrication and Applications

Brasses are alloys of Copper and Zinc. They may also contain small amounts of other alloying elements to impart advantageous properties. Brasses have high corrosion resistance and high tensile strength. They are also suited to fabrication by hot forging. Free machining grades of brass set the standard for machining, by which other metals are compared.

Brass Classes

Brasses are divided into two classes. The alpha alloys, with less than 37% zinc, and the alpha/beta alloys with 37-45% zinc. Alpha alloys are ductile and can be cold worked. Alpha/beta or duplex alloys have limited cold ductility and are harder and stronger. CZ131 is an alpha/beta alloy.

Alloy CZ131

The composition of Brass alloy CZ131 has been designed to provide a compromise between machinability and strength. Thus, it can be used in applications when machinability and riveting are required.

Chemical Composition of Brass alloy CZ131

Table 1. Chemical composition for brass alloy CZ131

Chemical Element

% Present

Cu

61.00 - 63.00

Pb

1.70 - 2.80

Al

0.0 - 0.05

Fe

0.0 - 0.10

Ni

0.0 - 0.30

Others (total)

0.0 - 0.20

Sn

0.0 - 0.10

Mn

0.0 - 0.10

Zn

Balance

Properties of Brass alloy CZ131

Mechanical Properties of Brass alloy CZ131

Table 2. Mechanical properties for brass alloy CZ131

Property

Value

Tensile Strength

340 - 480 MPa

Proof Stress

200 - 350 MPa

Elongation A

20 - 8%

Hardness Brinell

70 - 140 Max HB

Physical Properties of Brass alloy CZ131

Table 3. Physical properties for brass alloy CZ131

Property

Value

Density

8.50 g/cm3

Melting Point

885 °C

Modulus of Elasticity

105 GPa

Electrical Resistivity

0.066 x 10-6 Ω.m

Thermal Conductivity

115 W/m.K

Alloy Designations

Brass alloy CZ131 corresponds to the following designations:

CEN

BS

UNS

ISO

CW606N

CZ131

C35300

CuZn37Pb2

Corrosion Resistance of Brass alloy CZ131

Corrosion resistance of Brass alloy CZ131 is rated from fair to excellent in most environments.

Fabrication of Brass alloy CZ131

Cold Working of Brass alloy CZ131

Brass alloy CZ131 has only a fair rating for cold working.

Hot Working of Brass alloy CZ131

Hot forming of Brass alloy CZ131 is poor.

Heat Treatment of Brass alloy CZ131

Solution treatment or annealing can be done by rapid cooling after heating to 430-600°C.

Machinability

This alloy has a machinability rating of 90 when Alloy 360 FC Brass is 100.

Welding and Joining of Brass alloy CZ131

Soldering of Brass alloy CZ131 is rated as “excellent” and brazing is “good”. Butt welding is fair but all other welding methods are not recommended.

Applications of Brass alloy CZ131

Brass alloy CZ131 is typically used in:

  • Fasteners
  • Rivets
  • Domestic appliances
  • Automotive engineering
  • Hose fittings
  • Intricate parts such as clock components

Supplied Forms

Brass alloy CZ131 is typically supplied by Aalco in the following form:

  • Round bar

DISCLAIMER

This Data is indicative only and must not be seen as a substitute for the full specification from which it is drawn. In particular, the mechanical property requirements vary widely with temper, product and product dimensions. The information is based on our present knowledge and is given in good faith. However, no liability will be accepted by the Company is respect of any action taken by any third party in reliance thereon.

As the products detailed may be used for a wide variety of purposes and as the Company has no control over their use; the Company specifically excludes all conditions or warranties expressed or implied by statute or otherwise as to dimensions, properties and/or fitness for any particular purpose.

Any advice given by the Company to any third party is given for that party’s assistance only and without liability on the part of the Company. Any contract between the Company and a customer will be subject to the company’s Conditions of Sale. The extent of the Company’s liabilities to any customer is clearly set out in those Conditions; a copy of which is available on request.

This information has been sourced, reviewed and adapted from materials provided by Aalco - Ferrous and Non-Ferrous Metals Stockist.

For more information on this source, please visit Aalco - Ferrous and Non-Ferrous Metals Stockist.

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