Background

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. CZ130 is a duplex or alpha/beta alloy.
Alloy CZ130

Brass alloy CZ130 is a machinable brass typically used in sections.
Chemical Composition

Table 1. Typical chemical composition for brass alloy CZ130

%


CZ130 / CW624N

Cu


55-57

Pb


1.6-3.0

Sn


-

Fe


-

Al


0.05-0.5

Mn


-

Zn


Balance

Si


-

Ni


-

CZ130 also covers brass with Aluminium removed from the above composition. This variation is CW623N. The addition of Aluminium imparts a golden lustre which eliminates the need for additional polishing.
Properties
Mechanical Properties

Table 2. Typical mechanical properties for brass alloy CZ130

Grade


CZ130

Tensile Strength (MPa)


350-420

Proof Stress 0.2% (MPa)


150-220

Elongation A5 (%)


30-20

Hardness (HV)


100-130


Physical Properties

Table 3. Typical physical properties for brass alloy CZ130

Property


Value

Density


8.44 g/cm3

Melting Point


890°C

Thermal Conductivity


109 W/m.K
Alloy Designations

Brass alloy CZ130 corresponds to the following designations:

CEN


BS


UNS


ISO

CW624N
CW623N


CZ130


C3800


CuZn43Pb2Al
CuZn43Pb2
Corrosion Resistance

CZ130 has good corrosion resistance in most environments.
Fabrication
Cold Working

CZ130 has a poor to fair rating for cold working.
Hot Working

Hot working of CZ130 is excellent. It is normally formed into complex profiles using hot extrusion.

The hot forgeability rating of CZ130 is good to excellent.
Machinability

CZ130 has a very good machinability rating of 90 compared to Alloy 360 FC Brass which is rated as 100.
Welding and Joining

· Soldering of CZ130 is rated as “excellent”.

· Oxyacetylene welding and gas shielded arc welding are not recommended.

· Resistance welding is rated as “fair”.

· Friction welding is rated as “good”.
Supplied Forms

CZ130 is typically supplied by Aalco in the following form:

· Angle