ThePipingMart Blog Grades Copper C104 (C10400 Copper) – Composition, Properties, and Uses

Copper C104 (C10400 Copper) – Composition, Properties, and Uses

Copper C104

Copper C104 is an alloy that is often used in welding, machining, and other metalworking processes. This copper alloy has a wide range of physical and mechanical properties that make it ideal for many applications. In this blog, we will discuss the composition, chemical properties, mechanical properties, physical properties, uses, corrosion resistance, heat resistance, heat treatment, and machining of Copper C104. Keep reading to learn more about this versatile alloy!

What Forms is Copper C104 Available at Piping Mart?

  • Bar
  • Bolt
  • Pipe
  • Screw
  • Tubing
  • Valves
  • Washers
  • Flanges
  • Fasteners
  • Electrodes
  • Stud Bolts
  • Sheet Plates
  • Pipe Fittings

Copper C104 Composition

C104 Copper is an alloy composed of 99% copper and 1% phosphorus. The addition of phosphorus to the copper improves its strength and makes it easier to work with than pure copper. It also increases its ability to resist corrosion and oxidation. Additionally, the presence of phosphorus makes it easier to weld than other copper alloys.



Others (Total)


Copper (Cu)


Copper C104 Chemical Properties

The chemical properties of Copper C10400 are determined by its composition. Copper provides excellent electrical conductivity, while phosphorus enhances its strength and corrosion resistance. Additionally, the small amount of phosphorus present in this alloy promotes better machinability and weldability than other copper alloys.

Copper C104 Mechanical Properties

The mechanical properties of Copper C104 are determined by its composition as well as its heat treatment process. This alloy has an excellent tensile strength (115 ksi) and yield strength (90 ksi). It also has good ductility (25-40%), which makes it easier to form into shapes or bend into curves without cracking or breaking. Additionally, it has high fatigue strength (50-60ksi), which makes it more resistant to wear over time than other copper alloys.



Tensile Strength (MPa)


Proof Stress (MPa)


Elongation A50 mm


Hardness Vickers

40-110 HV

Copper C104 Physical Properties

UNS C10400 has a density of 8.9 g/cm3, which is slightly higher than most other copper alloys due to the presence of phosphorus in this alloy. It has a melting point range between 1083-1148°C (1980-2100°F) which means that it can be heated up quite easily for welding or machining purposes without any risk of damage or warping due to excessive temperatures. Lastly, this alloy has a Brinell hardness rating between 30-40 HBW which indicates that it’s relatively soft compared to other metals but still strong enough for most applications where durability is important such as engines components or fasteners exposed to extreme temperatures or environments with high levels of vibration or shock loading.




8.92 g/cm3

Melting Point

1083 °C

Modulus of Elasticity

117 GPa

Electrical Resistivity

0.171 x 10-6 Ω.m

Thermal Conductivity

391.1 W/m.K

Thermal Expansion

16.9 x 10-6/K

Copper C104 Equivalent









Copper C104 Specifications

  • ASME SB152
  • ASTM B1
  • ASTM B133
  • ASTM B152
  • ASTM B187
  • ASTM B188
  • ASTM B189
  • ASTM B2
  • ASTM B224
  • ASTM B246
  • ASTM B272
  • ASTM B298
  • ASTM B3
  • ASTM B355
  • ASTM B49
  • ASTM B506
  • MIL B-20292
  • MIL W-3318
  • UNS C10400

Copper C104 Uses

Copper C104 has a plethora of uses to offer. It is an alloy composed of over 99% copper, making it resistant to corrosion and oxidation in most cases; this makes it an ideal candidate for various industries and applications. Many hardware designers have leveraged Copper C104 due to its high durability, allowing them to craft long-lasting components that are used in electronic devices such as laptops and computer parts. Additionally, Copper C104 is making waves in the automobile industry because of its superior structural integrity; this metal alloy can bear immense weight and pressure without crumbling. In particular, its ability to conduct heat efficiently is also useful for car engines and other parts that need cooling systems. All things considered, Copper C104 is truly a one-stop shop for various different needs.

Electrical Wiring

Copper is often used in electrical wiring because it is an excellent conductor of electricity. Copper wiring is found in a variety of applications, including homes, office buildings, and automobiles.

Plumbing Pipes

Copper is also commonly used in plumbing pipes as it is resistant to corrosion and has a long lifespan. Copper pipes are often used in both residential and commercial plumbing applications.


Copper cookware is also popular as it heats evenly and quickly, and it does not react with food. Copper pots and pans are often lined with another material, such as tin or stainless steel, to prevent the copper from coming into contact with food.

Roofing Material

Copper is also used in roofing material as it is durable and has a high resistance to weathering. Copper roofing is often seen on historic buildings as well as modern ones.

Decorative Applications

Due to its beauty, copper is also used in a variety of decorative applications. Copper can be found in sculptures, jewelry, coins, and other art forms.

Industrial Applications

Copper is also used in a variety of industrial applications due to its strength and durability. Copper is often used in pipes and tubing, as well as in machine parts such as bearings and gears.

Electrical Conductivity

One of the most important properties of copper is its electrical conductivity. This means that copper can easily carry an electric current, which makes it ideal for use in electrical wiring and other applications where electricity needs to be conducted efficiently.

Thermal Conductivity

Another important property of copper is its thermal conductivity, which means that it can easily transfer heat. This makes copper an ideal material for use in cookware, as well as in heat exchangers and other industrial applications where heat needs to be transferred efficiently.


Cu C104 welding is an ingenious process that offers a unique alternative to more traditional methods of welding metals. By heating the copper to its melting point, it becomes possible to easily join the two pieces of metal together in a cohesive fashion without having to resort to using other materials as filler. This process can produce excellent results for any type of joint and therefore is often used in demanding applications such as aerospace engineering. In order to ensure precision and accuracy when performing this type of welding, extra care must be taken when carrying out the process, and it is important that the copper pieces are not overheated during the welding process. With these considerations taken, copper C104 welding provides an efficient and dependable way of connecting two metal components together in a safe and reliable manner.

Corrosion Resistance

UNS C10400 is often valued for its corrosion resistance in both outdoor and indoor environments. This corrosion-resistant property comes from copper’s natural inclination to form an oxide layer, which acts as a protective buffer between the material and the environment, shielding it from further harm. Copper C104 also offers excellent electrical conductivity and heat transfer, making it an ideal option for many machine components and parts. With its intuitive level of protection from oxidation, this material can be used in various industrial and domestic applications without fear of damage or deterioration over time.

Heat Resistance

Copper C104 is a popular choice for manufacturing due to its incredibly high heat resistance that allows it to withstand very high temperatures. Its ability to maintain its properties when subjected to extreme heat makes copper C104 the optimal material choice for applications ranging from engine components, lighting fixtures, cooking vessels, and any machine parts that are exposed to high temperature or thermal cycling operations. Its unique alloy composition also makes it an ideal alloy for welding and resistance to corrosive elements such as salt water and acid rain. Copper C104 is truly an industrial workhorse that offers superior properties for tough applications with heavy-duty thermal needs.

Heat Treatment

Heat treatment of Copper C104 is a process used by metalworking professionals to maximize the properties of this type of copper. By manipulating the material’s temperature, it can be strengthened or softened depending on what its end purpose will be. Heat treatments consist of annealing, quenching, and tempering as well as other processes that are designed to ensure copper C104 meets the highest standards for safety and durability in whatever application it will be used for. With proper heat treatment, this type of copper can have higher tensile strength, increased ductility and malleability, improved resistance to corrosion, and longer-lasting functionality than if left untreated.


Copper C104 machining is an invaluable technique for a variety of applications, from the creation of heat sinks and circuit boards to intricate pieces of jewelry. The process involves cutting and shaping copper material into desired shapes and sizes with the help of specialized tools such as lathes, drill bits, saws, and grinders. Copper C104 machining allows for improved accuracy compared to traditional methods of processing metal materials. This makes it an ideal choice when precision or repeatability is required. Additionally, the material properties of copper mean that it’s both economical and durable over long-term use. All in all, copper C104 machining is a frequent go-to choice for many manufacturing projects.


Copper C104 is a versatile alloy with many desirable properties, including excellent electrical conductivity, enhanced strength due to the presence of phosphorus in its composition, good ductility for forming into shapes or bending without cracking or breaking under pressure; high fatigue strength for increased wear resistance; a melting point range suitable for welding; as well as good corrosion and oxidation resistance making it suitable for use in harsh environments or areas exposed frequently to moisture or chemicals. Its combination of desirable features makes it an ideal choice for many metalworking applications such as automotive parts manufacturing; wiring installations; plumbing fixtures; electronics components; structural supports; piping systems; machine components; fasteners; valves & fittings, etc… If you’re looking for an economical yet reliable metalworking material then consider using Copper C104!

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