ThePipingMart Blog Grades Brass CZ131 (CW606N) – Composition, Properties, and Uses

Brass CZ131 (CW606N) – Composition, Properties, and Uses

Brass CZ131

Brass is a highly versatile and commonly used alloy, with various formulations catering to specific applications. One such type of brass that holds immense value in the industrial sector is brass CZ131. This alloy is widely known for its incredible strength, durability, and resistance to corrosion. Keep reading if you want to learn more about brass CZ131, its composition, properties, and industrial uses!

What is Brass CZ131?

Brass CZ131 is an alpha-beta brass alloy with excellent machinability. It can be cold-worked, hot-formed, soldered, extruded, and die-cast. The alloy contains smaller amounts of copper, zinc, lead, and tin as its main component. Its properties make it famous for various features, including fittings, valve bodies, gears, switch parts and locks.

Brass CZ131 Composition

Brass CZ131, or CW606N, is alpha brass created from copper, zinc, and a minimum percentage of lead. The lead element in the formulation enhances the machinability of the alloy, making it easier to work with. Brass CZ131 contains 64-66% copper, 33-34% zinc, and 0.3-0.6% lead, per the British standard BS EN12168.

Chemical Element

% Present


61.00 – 63.00


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



Brass CZ131 Mechanical Properties

Brass CZ131 boasts exceptional mechanical properties, making it a popular choice for various applications. It has a tensile strength ranging from 345-570 N/mm² and an elongation capacity of 30-39%. The alloy also has a high yield strength of 150-420 N/mm², which makes it suitable for heavy-duty industrial applications.



Tensile Strength

340 – 480 MPa

Proof Stress

200 – 350 MPa

Elongation A

20 – 8%

Hardness Brinell

70 – 140 Max HB

Brass CZ131 Physical Properties

Apart from its mechanical properties, brass CZ131 has some unique physical characteristics that set it apart from other brass alloys. It is a lightweight alloy with approximately 8g/cc density. The thermal conductivity of brass CZ131 is also noteworthy, measuring at 100-130 W/m.K.




8.50 g/cm3

Melting Point

885 °C

Modulus of Elasticity

105 GPa

Electrical Resistivity

0.66 x 10-6 Ω.m

Thermal Conductivity

115 W/m.K

Brass CZ131 Equivalents









Brass CZ131 Specifications

  • C35340
  • C35300
  • CW606N
  • BS2874
  • CuZn37Pb2

Brass CZ131 Uses

Because of its strength, durability, and excellent machinability, brass CZ131 has become a popular choice for various industrial applications. It is ideal for producing marine, gas, and water components, such as couplings, plumbing fittings, and pump parts. It also finds use in the automotive industry, where it is used for valve guides and transmission parts.

Brass CZ131 Corrosion Resistance

Brass CZ131 is an alloy renowned for its exceptional corrosion resistance. This makes it ideal for use in harsh environments, where exposure to water, oxygen, and other corrosive elements is inevitable. The lead in the alloy reduces the possibility of dezincification, making it suitable for marine environments.

Brass CZ131 Heat Treatment and Machining

Heat treatment of brass CZ131 is generally not required, given its already remarkable mechanical properties. However, it can be annealed or stress-relieved to improve its machinability further. Brass CZ131 is also an easy-to-machine alloy, which makes it a go-to choice for industries looking for components that require complex machining processes.

Brass CZ131 Welding

Brass CZ131 is generally difficult to weld as it is susceptible to porosity formation. However, it can be brazed using soldering or soft soldering methods.


Brass CZ131 is a popular and highly versatile alloy widely used for its strength, durability, and resistance to corrosion. Its excellent machinability and mechanical and physical properties make it suitable for various industrial applications. From plumbing fittings to automotive components, and marine equipment, brass CZ131 is undoubtedly a valuable part of modern-day manufacturing.

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