C87900 Hard copper rod

C87900 hard copper rod is a high-strength, high-conductivity copper alloy bar stock primarily used in the manufacture of electrical and mechanical components requiring excellent mechanical properties and electrical performance.

High Electrical Conductivity

Superior Mechanical Strength

Good Corrosion Resistance

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Introduction

C87900 Hard copper rod

C87900 hard copper rod is a high-performance copper-based alloy material that achieves excellent comprehensive mechanical properties through specific work-hardening processes. This material combines high tensile strength with good electrical and thermal conductivity, while also offering outstanding wear resistance and corrosion resistance, enabling it to maintain stable dimensional and shape accuracy under complex operating conditions. Its well-balanced hardness and strength make it particularly effective in applications involving heavy loads, impact forces, or frictional wear.

Based on these performance characteristics, C87900 hard copper rod is widely used in electrical connectors, high-voltage switch contacts, welding electrodes, mold inserts, and various precision mechanical components. In practical applications, this material not only effectively reduces energy loss and overheating risks but also significantly extends the service life of components while reducing maintenance frequency. Additionally, its excellent machinability facilitates secondary processing operations such as turning, drilling, and milling, making it well-suited to meet the requirements of different industries for complex geometries and tight tolerances.

parameter

C87900 Hard copper rod

Parameter Category	Specific Parameter	Value / Range
Chemical Composition	Copper (Cu)	Balance (approx. 85.0–89.0%)
	Tin (Sn)	4.0–6.0%
	Lead (Pb)	4.0–6.0%
	Zinc (Zn)	3.0–5.0%
	Nickel (Ni)	≤ 1.0%
	Iron (Fe)	≤ 0.5%
	Antimony (Sb)	≤ 0.25%
	Phosphorus (P)	≤ 0.05%
	Sulfur (S)	≤ 0.08%
Physical Properties	Density (g/cm³)	8.7–8.9
	Melting Range (°C)	880–1010
	Thermal Conductivity (W/(m·K))	Approx. 70–90
	Electrical Resistivity (μΩ·cm)	Approx. 8.0–12.0
	Electrical Conductivity (%IACS)	Approx. 10–18
Mechanical Properties	Tensile Strength (MPa)	450–600
	Yield Strength (MPa)	250–380
	Elongation (%)	5–15
	Hardness (HB)	120–180
	Modulus of Elasticity (GPa)	Approx. 100–110
Processability	Machinability	Good (comparable to leaded copper alloys)
	Hot Working Temperature (°C)	650–750
	Annealing Temperature (°C)	450–600
Service Characteristics	Corrosion Resistance	Good (resistant to atmosphere, fresh water, and weak acids)
	Wear Resistance	Excellent
	Electrical Conductivity	Moderate

Advantages

Advantages of C87900 Hard copper rod

Excellent Wear Resistance

The alloy's unique composition, with optimized tin and lead content, provides outstanding anti-friction and anti-wear properties. This makes it highly durable in sliding-contact applications, such as bushings, bearings, and guide rails, significantly extending component service life under continuous friction or oscillating motion.

Superior Machinability

The presence of lead in the alloy acts as a chip breaker and lubricant during cutting operations, resulting in excellent machinability. This allows for high-speed machining, smooth surface finishes, and precise dimensional control, reducing production time and tool wear while lowering overall manufacturing costs.

Good Balance of Strength and Ductility

C87900 hard copper rod offers a well-balanced combination of tensile strength and elongation. It provides sufficient structural integrity to withstand heavy mechanical loads while retaining enough ductility to absorb shocks and vibrations, reducing the risk of brittle fracture in demanding service environments.

Reliable Corrosion Resistance

The material exhibits good resistance to atmospheric corrosion, fresh water, and mild acidic environments. This corrosion resistance, combined with its mechanical durability, makes it a dependable choice for components exposed to moisture, humidity, or mildly aggressive media, ensuring long-term performance and reduced maintenance requirements.

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Applications for C87900 Hard copper rod

Electrical Connections and Switchgear Equipment

Leveraging its good electrical conductivity and resistance to arc erosion, C87900 hard copper rod is widely used in high-voltage switch contacts, circuit breaker contacts, busbar connectors, and electrical terminal blocks. Its excellent wear resistance ensures reliable long-term contact performance under frequent opening and closing operations, effectively reducing contact resistance and the risk of overheating.

Welding Electrodes and Resistance Welding Tools

With its high thermal conductivity and resistance to softening at elevated temperatures, this material is well-suited for resistance welding electrodes, electrode caps, welding gun arms, and welding fixtures. Under repeated welding thermal cycles, C87900 maintains stable hardness and dimensional integrity, ensuring consistent weld quality and extending tool service life.

Mechanical Components and Wear Parts

The alloy's outstanding wear resistance and good load-bearing capacity make it an ideal choice for mechanical components subject to sliding friction and heavy loads, such as bushings, bearings, guide rails, wear plates, and piston rings. Its self-lubricating properties and anti-galling characteristics contribute to reduced friction and improved operational smoothness in moving assemblies.

Mold Inserts and Precision Tooling

Thanks to its excellent machinability, dimensional stability, and moderate hardness, C87900 hard copper rod is frequently used in mold inserts, forming dies, and precision tooling components. It is particularly favored in applications requiring complex geometries, tight tolerances, and good surface finishes, such as injection molding cavity inserts, blow mold components, and metal-forming tools.

Strength

Company Strength

Our Team

Gnee group is a professional one-stop supply chain company for steel products in China. The copper technology has reached the world average technology level and has been approved by dozens of project companies to be the star company in Asia.

Established in 2008 with a registered capital of 5 million RMB, Gnai has made remarkable progress and development in the steel market. At present, the company has a total investment of 30 million yuan, a plant area of more than 35,000 square meters and more than 200 employees. With a clear strategic framework, a complete governance structure, a solid management foundation, and strong financial and human resources, the company is becoming the most professional internationalized steel supply chain company in the Central Plains.

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