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

Chromium Copper Alloy UNS C18200 – Composition, Properties and Uses

UNS C18200

UNS C18200 is a copper alloy with excellent mechanical and physical properties, making it suitable for multiple industrial applications. This alloy contains chromium and copper, giving it outstanding corrosion resistance and wear. With its unique characteristics, UNS C18200 has become popular in various applications, from aerospace to electrical and electronic devices. Here, we’ll discuss the essential information you need about this special alloy to understand why it’s a popular choice in the industry.

What is UNS C18200?

UNS C18200 is a copper alloy that is highly sought after for its unique properties and numerous applications in various industries. Also known by its trade name, Chromium Copper, this alloy contains a small percentage of chromium, which enhances its strength, corrosion resistance and thermal conductivity. Chromium Copper has found its niche in areas where high temperatures are a concern, such as electrical and electronic devices, aerospace engineering, and welding applications. This special alloy is durable and malleable, making it easier for manufacturers to shape and mould it into intricate designs. If you’re looking for a versatile material that can withstand extreme conditions, UNS C18200 is worth considering.

C18200 Composition

UNS C18200 comprises 96% copper and 2% chromium, resulting in excellent wear resistance and exceptional strength. Copper improves the alloy’s electrical conductivity, while chromium enhances corrosion resistance.

Element Content (%)
Cu 99.1
Cr 0.9

C18200 Physical Properties

This alloy has excellent mechanical properties, including high tensile strength, hardness, and wear resistance. Its thermal and electrical conductivity are also high, making it ideal for heat exchangers and electrical conductors.

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

C18200 Mechanical Properties

UNS C18200 has a tensile strength of 689-896 MPa, Rockwell B75 – 97 hardness, and a 15-20% elongation. Additionally, it has an ultimate tensile strength of 2380 MPa, yield strength of 1035 MPa and compression strength of 1302 MPa.

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

C18200 Uses

UNS C18200 is used in various industrial applications, including electrical and electronic devices, marine engineering, and aerospace technology. This alloy is commonly used in applications requiring excellent corrosion and wear resistance.

C18200 Hardness

UNS C18200 can achieve a maximum hardness of 97 on the Rockwell B scale. The high hardness of this alloy results from the presence of chromium, which enhances its strength and wear resistance.

C18200 Heat treatment

Heat treatment is crucial in improving the mechanical properties of UNS C18200. The solution annealing process involves heating the alloy to 927°C for 30 to 60 minutes, followed by a quench in water or air. This process enhances the alloy’s ductility and toughness.

C18200 Welding

Welding UNS C18200 is relatively easy. Gas tungsten arc welding (GTAW) and gas metal arc welding (GMAW) can join the alloy with other metals. However, welding the alloy can result in a reduction of its electrical conductivity.

C18200 Corrosion Resistance

UNS C18200 has excellent corrosion resistance properties due to its high chromium content. It is resistant to oxidizing, reducing, and marine environments. This makes it a suitable material for applications exposed to harsh environments.


UNS C18200 is a copper alloy with exceptional mechanical and physical properties that enhance its corrosion and wear resistance. Its unique composition makes it popular for various industrial applications, including electrical and electronic devices, marine engineering, aerospace technology, etc. The alloy’s high hardness and excellent thermal and electrical conductivity perform well in harsh environments. If you’re looking for an alloy that combines strength, durability, and corrosion resistance, UNS C18200 is an excellent choice.

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