ThePipingMart Blog Grades C706 Copper (UNS C70600) – Composition, Properties and Uses

C706 Copper (UNS C70600) – Composition, Properties and Uses

Copper C706

UNS C70600 is a type of copper alloy that has been praised for its strength and durability. It is popularly used in electrical engineering, aerospace, automotive, and shipbuilding industries. In this blog post, we will discuss the composition, chemical properties, mechanical properties, physical properties, uses, corrosion resistance and heat resistance of copper C706, as well as its heat treatment and machining processes.

C70600 Composition

UNS C70600 is composed primarily of copper (99.3% minimum) with alloying elements including nickel (4-4.5%), silver (0.15-0.45%), zinc (0.15-0.45%), tin (0-1%), phosphorus (maximum 0.05%) and lead (maximum 0.2%). This combination of metals makes it a powerful alloy with excellent wear resistance and high strength at elevated temperatures.

Element Content (%)
Cu 88.7
Fe 13
Ni 10

C70600 Chemical Properties

The chemical properties of this alloy are excellent; it is resistant to atmospheric corrosion and seawater corrosion due to its low carbon content, which inhibits pitting corrosion when exposed to high chloride concentrations such as salt water spray or sea fog. Additionally, it has good formability due to its low carbon content, allowing easy bending or forming without cracking or splitting during the process.

C70600 Physical Properties

UNS C70600 is an alloy that contains 90% metallic copper combined with 10% other metals as alloying elements. This alloy exhibits outstanding corrosion resistance and has excellent electrical conductivity, making it the perfect choice for applications requiring stability and efficient performance. Its malleability also makes it useful in construction projects where secure and long-lasting connections are needed. In addition, Copper C706 has extra strength due to its high tensile strength and longer service life. As a result of all these benefits, Copper C706 is the optimal choice for anyone looking for a reliable material to meet their needs.

Properties Metric Imperial
Density 8.94 g/cm3 0.323 lb/in³

C70600 Thermal Properties

Properties Metric Imperial
Thermal expansion co-efficient (@20-300°C/68-572°F) 17.1 µm/m°C 9.50 µin/in°F
Thermal conductivity (@20°C/ 68°F ) 40 W/mK 278 BTU in/hr.ft².°F

C70600 Equivalent

ASTM B543 ASTM B608 DIN 2.0872 MIL C-15726
MIL T-15005 MIL T-16420 MIL T-22214 SAE J461
SAE J463

C70600 Uses

UNS C70600 is an all-in-one material with many uses in the industrial and commercial sectors. It boasts excellent thermal and electrical conductivity properties, making it ideal for wiring and circuitry applications and high-temperature insulation. When exposed to corrosion and oxidization, Copper C706 remains relatively stable under harsh conditions making it a prime choice for underground piping systems. Furthermore, its malleability allows for endless customizations in many of these projects, allowing for a perfect fit in any environment. Its superior strength even withstands extreme pressure, meaning it can easily be used for hydraulic components too. With so many intriguing capabilities, Copper C706 is the optimum choice of material when seeking efficiency in engineering works.

Heat Resistance

Copper C706 exhibits superior thermal stability with a melting point between 1025°C – 1035°C depending on the alloying elements present in the material’s composition; due to this feature, the material can be used for applications requiring continuous exposure up to 1000°C without suffering from any significant loss in mechanical properties over time.

Heat Treatment

Copper C706 can be hardened by solution annealing followed by aging precipitation hardening treatments; however, due to the low carbon content within the material’s composition, quenching treatments are not recommended because they could cause a brittle fracture in specific components that have been previously formed using cold working processing methods.

Corrosion Resistance

Copper C706 has always been considered a versatile and reliable material because of its excellent corrosion resistance. This durable alloy is often used to build tanks, pipes, and core bodies due to its ability to withstand harsh conditions such as salt water and extreme weather. Its superior properties make it well-suited for coastal environments, industrial applications, and chemical processes where corrosion protection is essential. With the added advantage of being recyclable and cost-efficient, copper C706 is the obvious choice for projects requiring optimal corrosion resistance.


When machined, this material behaves similarly to most other grades of copper alloys meaning that standard machine tools can be used without any major modifications being needed before preparation. However, some operations, such as tapping threads, might need slight adjustments depending on the size of the hole tapped into the workpiece.


Copper C706 can be welded using standard fusion techniques such as gas metal arc welding. However, careful consideration should be taken when welding thin sections because these areas tend to suffer from excessive distortion when subjected to high levels of heat; brazing using fluxes is also possible, but again care should be taken when performing these types of operations because excessive heat input can cause cracking along the weld joint if not properly monitored during the procedure.


Copper C706 is an incredibly versatile copper alloy that offers excellent chemical, mechanical, physical, thermal, welding and machining characteristics suitable for various industrial applications ranging from electrical engineering and automotive manufacturing to aerospace engineering and shipbuilding. Its superior wear resistance and good formability make it ideal for use in high-temperature situations where conventional steel would fail while still providing superior impact strength even when operating at sub-zero temperatures. As always, consult your supplier before making any decisions regarding material selection so they can provide you with specific information regarding your application requirements.

Related Post