ThePipingMart Blog Grades Brass CZ121 (CW614N) – Composition, Properties, and Uses

Brass CZ121 (CW614N) – Composition, Properties, and Uses

Brass CZ121

When it comes to durable and malleable materials for various applications, brass is one of the popular choices. Among the brass grades, CZ121 is a common variant used in multiple industries, including marine, construction, and automotive. This expert guide will dive into brass CZ121’s composition, mechanical and physical properties and their uses, corrosion resistance, heat treatment, machining, and welding techniques.

What is Brass CZ121?

Cz121 (CW614N or EN12165) is a lead-free high tensile brass alloy with excellent machinability, formability and weldability. It offers superior corrosion resistance, high strength and thermal conductivity, making it an ideal material for various applications, from engineering components to decorative items.

Brass CZ121 Composition

Brass CZ121 is an alpha brass type comprising 68% copper, 2% lead, and 30% zinc. Alpha brass has excellent ductility and can be easily modified to fit various machining applications. In contrast, information offers increased machinability, and zinc balances the copper-lead alloy ratios, creating a material with excellent corrosion resistance.

Chemical Element



57.00 – 59.00


2.50 – 3.50

Al 0.0 – 0.05
Fe 0.0 – 0.30
Ni 0.0 – 0.30
Others (Total) 0.0 – 0.20
Tin 0.0 – 0.30



Brass CZ121 Mechanical Properties

Brass CZ121 is a versatile material with excellent mechanical properties. It has a tensile strength of 350 MPa and a yield strength of 140 MPa. CZ121 also has a high modulus of elasticity of approximately 108 GPa, making it an ideal material for applications that require a balance of toughness and durability.


Flat Bar & Profiles


Tensile Strength

360 – 500 MPa

360 – 500 MPa

Proof Stress

220 – 350 MPa

230 – 350 MPa

Elongation A

20 – 5%

20 – 5%

Hardness Brinell

90 – 160 HB

90 – 160 HB

Brass CZ121 Physical Properties

CZ121 has a density of 8.44 g/cm3, making it one of the densest brass variants available. It has a thermal conductivity of 117 W/(m⋅K), which is higher than copper and is an essential property for applications that require heat transfer.




8.47 kg/m3

Melting Point

875 °C

Modulus of Elasticity

97 GPa

Electrical Resistivity

0.62 x 10-6 Ω.m

Thermal Conductivity

123 W/m.K

Thermal Expansion

20.9 x 10-6/K

Brass CZ121 Equivalents






BS2874 CZ121



Brass CZ121 Uses

Due to its durability, malleability, and excellent machinability properties, CZ121 is used in various industries. It is widely used in the automotive, marine, and plumbing industries. Specifically, CZ121 manufactures train components, valve gears, fittings, and marine hardware.

Brass CZ121 Corrosion Resistance

CZ121 brass has high corrosion resistance, especially in marine and atmospheric environments. The zinc component provides the material with self-healing properties, which improves its longevity when exposed to saltwater and other harsh conditions.

Brass CZ121 Heat Treatment

Heat treatment is crucial in brass CZ121 manufacturing to improve its mechanical properties. The annealing process is the most common heat treatment method used in CZ121 production. The annealing process extends CZ121’s lifespan by minimizing cracks, increasing ductility, and reducing stress.

Brass CZ121 Machining

CZ121 brass exhibits excellent machineability properties, such as high-quality surface finish, sound chip forming, and good mechanical properties, making it an ideal material for precision machining projects. Machining processes such as turning, milling, drilling, and tapping are commonly used in CZ121 production.

Brass CZ121 Welding

Brass CZ121 is also weldable, provided the correct welding techniques are used. Procedures like brazing and soldering are recommended for joining CZ121 with other materials.


Brass CZ121 is a popular alloy utilized worldwide, well-known for its excellent mechanical and physical properties. CZ121’s durability, machinability, and corrosion resistance make it ideal for various applications, from automotive to marine industries. Proper heat treatment and machining techniques guarantee CZ121’s longevity and quality for years. Brass CZ121 is an excellent choice for durable and high-quality materials in different manufacturing applications.

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