ThePipingMart Blog Grades Copper Alloy UNS C66300 – Composition, Properties, and Uses

Copper Alloy UNS C66300 – Composition, Properties, and Uses

Copper Alloy (UNS C66300)

Copper Alloy (UNS C66300) is a versatile metal alloy with copper and zinc as its primary components. This alloy is mainly used in conducting equipment, plumbing fixtures, and marine applications. However, it also has various uses in art and architecture. This blog post will discuss the composition, mechanical and physical properties, uses, corrosion resistance, heat treatment, machining, and welding of this unique and durable metal alloy.

UNS C66300 Composition

Copper Alloy UNS C66300 is commonly known as high-strength yellow brass because it has a higher zinc content than traditional yellow brass. The composition of this copper alloy is 62.5% copper (Cu), 35% zinc (Zn), 2% aluminium (Al), and 0.5% manganese (Mn). This alloy is nickel-free because it does not contain nickel, which is often responsible for causing allergies in some people.

Element Content (%)
Copper, Cu +Silver, Ag 84.5-87.5
Tin, Sn 1.5-3
Iron, Fe 1.4-2.4
Phosphorus, P 0.35
Cobalt, Co 0.2
Lead, Pb 0.05
Zinc, Zn Remainder

UNS C66300 Mechanical Properties

Copper Alloy (UNS C66300) is a high-strength, heat-resistant, corrosion-resistant, and durable alloy. It has a tensile strength of 70000 psi (482 MPa), a yield strength of 42000 psi (290 MPa), and an elongation of 18 %.

Properties Metric Imperial
Modulus of elasticity 124 GPa 18000 ksi

UNS C66300 Physical Properties

This alloy is ideal for marine applications due to its excellent resistance to seawater, salt spray, and industrial pollutants. It has a thermal conductivity of 106 Btu/h-ft-°F and an electrical conductivity of 28% of the International Annealed Copper Standard (IACS), making it a good conductor of heat and electricity.

Properties Metric Imperial
Density 8.78 gm/cm3 0.317 lb/in3

UNS C66300 Uses

Copper Alloy (UNS C66300) is used in various applications due to its high strength, corrosion resistance, and durability. It is commonly used to manufacture valves, pumps, marine equipment, plumbing fixtures, electrical equipment, and architectural metalwork. The alloy is also used in art pieces and jewellery because of its beautiful and unique yellow colour.

UNS C66300 Corrosion Resistance

Copper Alloy (UNS C66300) has excellent seawater and salt spray resistance. It can withstand harsh industrial pollutants, making it an ideal choice for marine applications. The alloy is also resistant to tarnishing and atmospheric corrosion, which makes it an excellent choice for outdoor architectural metalwork.

UNS C66300 Heat Treatment

Copper Alloy (UNS C66300) can be heat-treated to increase strength and hardness. This process involves heating the alloy to a specific temperature and cooling it rapidly in water or oil. The process is known as quenching. The alloy can also be annealed, which involves heating it to a specific temperature and cooling it slowly to soften it. This heat treatment can make the alloy more malleable, more accessible to work with, and more conducive to machining.

UNS C66300 Machining

Copper Alloy (UNS C66300) can be easily machined and formed into different shapes and sizes. It has excellent hot and cold workability and can be readily bent, drawn, and stamped. The alloy is readily machinable and drilled, tapped, threaded, and sawed.

UNS C66300 Welding

Copper Alloy (UNS C66300) can be welded using most welding processes, such as gas tungsten arc welding (GTAW), gas metal arc welding (GMAW), and resistance welding. Brazing and soldering are also effective methods of welding this alloy. The welding process should be carried out carefully and with the correct procedures and equipment to avoid damaging the integrity and strength of the alloy.


Copper Alloy (UNS C66300) is a versatile and durable metal alloy with extensive use in different applications. Its unique properties make it ideal for marine, architectural, and industrial applications. Understanding the alloy’s composition, mechanical, and physical properties, as well as its uses and methods of heat treatment, machining, and welding, is critical in utilizing this alloy. Whether you are in construction, art, or manufacturing, investing in Copper Alloy (UNS C66300) is a wise decision.

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