ThePipingMart Blog Grades Medium Leaded Brass UNS C34000 – Composition, Properties, and Uses

Medium Leaded Brass UNS C34000 – Composition, Properties, and Uses

UNS C34000

When choosing the right material for a project, various options are available. One such material is UNS C34000, an alloy known for its excellent corrosion resistance and high ductility. But what exactly is UNS C34000, and what are its properties? This blog post deeply explores the composition, physical and mechanical properties, uses, hardness, heat treatment, welding, and corrosion resistance of UNS C34000. By the end of this post, you’ll better understand whether this material is right for your next project.

UNS C34000 Composition

UNS C34000 is a brass alloy of 60% copper and 40% zinc. In addition to these primary elements, it also contains small amounts of lead and iron, which can improve its machinability and strength, respectively. Overall, UNS C34000 is a relatively simple alloy, but its combination of copper and zinc results in a material with excellent corrosion resistance and high ductility.

Element Content (%)
Cu 62.5 – 66.5
Fe  0.10
Pb 0.80-1.40
Zn 34
Other  0.50

UNS C34000 Physical Properties

UNS C34000 has a density of 8.47 g/cm^3, making it slightly denser than pure copper. It has a melting point of 905°C and a boiling point of 1650°C. On the Mohs hardness scale, UNS C34000 has a hardness of 2.5, making it a relatively soft material. It also has a high coefficient of thermal expansion, meaning that it will expand and contract significantly with temperature changes.

Properties Metric Imperial
Density 8.47 g/cm3 0.306 lb/in³
Melting point 888°C 1630°F

UNS C34000 Mechanical Properties

UNS C34000 has high ductility, which can be easily formed and shaped without cracking or breaking. It also has a high tensile strength (ranging from 380 to 520 MPa depending on the temper), which makes it ideal for applications that require structural stability. However, due to its relatively soft nature, it may not be suitable for high-wear applications.

Properties Conditions
T (°C) Treatment
Poisson’s ratio 0.34 25
Elastic modulus 117 GPa 25
Tensile strength 324-607 MPa
Yield strength 103-414 MPa 25 (flat products, wire)
Elongation 60%

UNS C34000 Theral Properties

Properties Metric Imperial
Thermal expansion coefficient (@20-300°C/68-572°F) 20.3 µm/m°C 11.3 µin/in°F
Thermal conductivity (@20°C/68°F) 115 W/mK 798 BTU in/hr.ft².°F

UNS C34000 Equivalent

  • ASTM B121
  • ASTM B453

UNS C34000 Uses

UNS C34000 is used in various applications, including electrical components, decorative hardware, plumbing fixtures, and musical instruments. Its high corrosion resistance makes it particularly well-suited for marine or other harsh environmental applications. It is also commonly used in applications requiring strength, flexibility, and corrosion resistance.

UNS C34000 Hardness and Heat Treatment

As previously mentioned, UNS C34000 is a relatively soft material, with a hardness of 2.5 on the Mohs scale. It is unsuitable for high-wear applications, as it may deform or scratch easily. However, it can be heat-treated to improve its hardness and strength. Specifically, UNS C34000 can be annealed (heated to remove internal stresses), quenched (rapidly cooled to improve strength), and tempered (heated and then cooled slowly to improve toughness). The specific heat treatment method will depend on the intended application of the material.

UNS C34000 Welding and Corrosion Resistance

UNS C34000 is considered very weldable and compatible with a wide range of welding processes. This makes joining with other materials or repairing damaged parts easy. Additionally, UNS C34000 has excellent corrosion resistance, particularly to saltwater and other corrosive environments. This makes it ideal for marine or other applications where exposure to harsh chemicals or water is likely.


UNS C34000 is a brass alloy with excellent corrosion resistance and high ductility. While it may not be suitable for high-wear applications due to its relatively soft nature, it is widely used in various applications requiring a combination of strength, ductility, and corrosion resistance. With proper heat treatment and welding, it can be customized to suit a wide range of applications. Overall, UNS C34000 is a versatile material for your next project.

Related Post