ThePipingMart Blog Grades Chromium Copper UNS C18200 – Composition, Properties, and Uses

Chromium Copper UNS C18200 – Composition, Properties, and Uses

UNS C18200

Are you familiar with UNS C18200? UNS C18200, also known as Chromium Copper, is a famous copper alloy with many excellent properties and uses. This alloy is used in various electrical, automotive, and aerospace industries. This blog post will explore the composition, physical and mechanical properties, uses, hardness, and heat treatment of UNS C18200.

UNS C18200 Composition

UNS C18200 is a copper alloy that contains around 2% chromium. This alloy contains other elements, such as lead, zinc, and iron. The presence of chromium in UNS C18200 gives this alloy excellent corrosion resistance, which makes it well-suited for various applications.

Element Content (%)
Cu 99.1
Cr 0.9

UNS C18200 Physical Properties

UNS C18200 is a highly conductive alloy that has good ductility and malleability. The density of this alloy ranges from 8.9 to 8.94 g/cm³. Its melting point is about 1090°C, and the coefficient of thermal expansion is 17.5 μm/m°C. UNS C18200 also has an excellent thermal conductivity of 300 W/m·K.

Properties Metric Imperial
Density 8.89 g/cm3 0.321 lb/in3
Melting point 1070°C 1958°F

UNS C18200 Mechanical Properties

UNS C18200 has excellent mechanical properties, with a tensile strength of around 600 MPa. This alloy also has high corrosion fatigue strength, which means that it can withstand cyclic loading in a corrosive environment. UNS C18200 has Young’s modulus of around 120 GPa and a Poisson’s ratio of 0.32.

Properties Metric Imperial
Hardness, Rockwell B (50.8 – 76.2 mm/2.00 – 3.00 in) 65 65
Hardness, Rockwell B (25.4 – 50.8 mm/1.00 – 2.00 in) 70 70
Hardness, Rockwell B (≤25.4 mm/1.00 in, heat treated)  75.0  75.0
Tensile strength at break (any thickness)  379 MPa  55000 psi
Yield strength (0.500, any thickness)  379 MPa  55000 psi
Modulus of elasticity 117 GPa 17000 ksi
Poissons ratio 0.181 0.181
Shear modulus 49.6 GPa 7200 ksi

UNS C18200 Thermal Properties

Properties Metric Imperial
Thermal Conductivity (20.0°C/ 68.0°F) 323.4 W/mK 2244 BTU in/hr.ft².°F

UNS C18200 Uses

UNS C18200 is a widely used copper alloy found in various applications. This alloy is primarily used in electrical applications, including contacts, terminals, connectors, and switches. UNS C18200 also has applications in the automotive and aerospace industries, where it is used for welding electrodes and components.

UNS C18200 Hardness

UNS C18200 is known for its excellent hardness and wear resistance. The Brinell hardness of this copper alloy ranges from 110 to 130 HB. The alloy has a Vickers hardness of around 130 HV, making it an excellent material for wear-resistant applications.

UNS C18200 Heat Treatment

UNS C18200 can be heat-treated to enhance its mechanical properties. This alloy can be annealed at temperatures ranging from 425°C to 650°C to improve its ductility and machinability. Alternatively, UNS C18200 can be quenched and tempered to improve its hardness and wear resistance.


UNS C18200 is a versatile and valuable copper alloy with many excellent properties and uses. This alloy contains chromium, lead, zinc, and iron, which give it excellent corrosion resistance and wear resistance. UNS C18200 is used in many electrical, automotive, and aerospace industries. It is known for its superb hardness, ductility, and thermal conductivity. If you need a copper alloy that is strong, durable, and can withstand harsh environments, then UNS C18200 might be the perfect material for your project.

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