ThePipingMart Blog Grades UNS C32000 Copper Alloy – Composition, Properties And Uses

UNS C32000 Copper Alloy – Composition, Properties And Uses

UNS C32000 Copper Alloy

Copper is a popular metal that has been in use for centuries. It has high conductivity and excellent corrosion resistance making it ideal for a wide range of applications. One of the many varieties of copper alloys is UNS C32000. This copper alloy is popular in manufacturing due to its unique properties. This blog post will discuss everything you need about UNS C32000, including its composition, physical and mechanical properties, uses, hardness, heat treatment, welding, and corrosion resistance.

UNS C32000 Copper Alloy Composition

UNS C32000 is a leaded yellow brass copper alloy that contains 62-65% copper, 0.8-1.2% lead, and 27-32% zinc. The alloy also contains small amounts of iron, manganese, and nickel. The lead content in UNS C32000 provides excellent machinability, which makes it highly desirable in the manufacturing industry.

Element Content (%)
Copper, Cu 83.5-86.5
Lead Pb 1.5-2.2
Nickel, Ni 0.25
Iron, Fe 0.1
Zinc, Zn Remainder

UNS C32000 Copper Alloy Physical Properties

UNS C32000 has a density of 8.53 g/cm³ and a melting point of 895-935°C. It has a good thermal conductivity of 97 W/m·K and a specific heat capacity of 385 J/kg·K. The electrical conductivity of UNS C32000 is 30% IACS (International Annealed Copper Standard).

UNS C32000 Copper Alloy Mechanical Properties

UNS C32000 has excellent tensile strength but is brittle when subjected to severe cold working. It has a yield strength of 240 MPa, a tensile strength of 415-570 MPa, and an elongation of up to 40%. The alloy also has a high fatigue strength and can withstand bending, twisting, and other forms of deformation without cracking.

Temper Thickness Tensile Str. Yield Str. Elong.
H04 2 mm (0.08 in) 496 MPa (72 ksi) 386 MPa (56 ksi) 4%
OS050 2 mm (0.08 in) 296 MPa (43 ksi) 124 MPa (18 ksi) 38%

UNS C32000 Copper Alloy Equivalent

  • UNS C32000 leaded red brass has a copper content of not less than 83.5%.

UNS C32000 Copper Alloy Uses

UNS C32000 copper alloy is widely used in manufacturing due to its excellent machinability, corrosion resistance, and high tensile strength. It is commonly used to produce valves, pumps, hardware, and electrical components. The alloy is also used in marine applications due to its excellent resistance to seawater corrosion.

UNS C32000 Copper Alloy Hardness

UNS C32000 has a hardness of 90 HRB, making it easy to machine and form. The alloy has good wear resistance and can withstand heavy loads and impact without deforming or cracking.

UNS C32000 Copper Alloy Heat Treatment

UNS C32000 copper alloy is not heat-treatable. However, it can be annealed to improve its machinability and formability. Annealing should be carried out at temperatures between 480-600°C for one hour.

UNS C32000 Copper Alloy Welding

UNS C32000 copper alloy can be welded using soldering or brazing. However, it is not recommended for welding as it can lead to embrittlement of the material.

UNS C32000 Copper Alloy Corrosion Resistant

UNS C32000 copper alloy has excellent corrosion resistance, particularly in seawater, making it perfect for use in marine environments. The lead content in the alloy provides a protective film on the material’s surface, preventing corrosion.


UNS C32000 copper alloy is a popular material in the manufacturing industry due to its unique properties. Its composition, physical and mechanical properties, uses, hardness, heat treatment, welding, and corrosion resistance have been discussed in detail in this blog post. Understanding these properties will help engineers and designers to choose the right material for their application. With its excellent machinability, tensile strength, and corrosion resistance, UNS C32000 remains a top choice for many industrial applications.

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