High-conductivity and high-machinability alloys tailored to meet East African engineering demands.
Specifically developed for high-speed automatic screw machine operations. Offers 85% machinability index of free-cutting brass alongside excellent electrical and thermal conductivity.
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Engineered for bespoke industrial fittings, electrical connectors, and fluid control parts. Offers outstanding wear resistance and highly controllable dimensional stability.
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Premium free-cutting copper alloy exhibiting high thermal and electrical conductivity. Essential for welding torch tips, electrical terminals, and switchgear components.
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High-performance resistance welding electrodes, wheels, and tips. Resists deformation at high operating temperatures, ensuring stability in automated lines.
View Product SpecsPioneering Clean Metallurgy & High-Conductivity Alloys globally.
Established in May 2017, Sichuan Kepai New Materials Co., Ltd. is a high-tech private enterprise specializing in the R&D, manufacture, and global distribution of high-conductivity, high-strength free-cutting tellurium copper, sulfur copper, and specialized copper alloys. Equipped with a state-of-the-art 29,000 square meter factory space and over 30 utility patents, Kepai has successfully optimized supply chains for over 1,000 customers worldwide.
As Rwanda advances its "Vision 2050" industrial modernization roadmap, Kigali and adjacent industrial zones are experiencing a surge in demand for reliable electrical infrastructure, energy transmission gear, and modern manufacturing components. Kepai is positioned as a dependable strategic partner for Rwanda, offering customized high-performance copper alloys to support critical power distribution, e-mobility infrastructure, and automated agricultural processing systems.
How modern metallurgy addresses the conflict between high machinability and electrical conductivity.
Pure copper (ETP C11000) features excellent conductivity (100% IACS) but is highly ductile, soft, and gummy. This makes high-speed precision CNC milling, drilling, and turning tasks difficult, leading to rapid tool wear, excessive burring, and low dimensional yield rates. Lead-based free-cutting brass (C36000) provides great machinability but is limited by a low conductivity rate (26% IACS).
C14700 Sulfur Copper (Cu-S) bridges this gap. By adding a small, controlled amount of sulfur (0.2% to 0.7%), the alloy forms microscopic copper sulfide inclusions. These inclusions act as natural chip breakers during machining operations without degrading the electrical conductivity of the copper matrix.
| Alloy Grade | Chemical Composition | Electrical Conductivity (% IACS) | Machinability Index | Tensile Strength (MPa) |
|---|---|---|---|---|
| C14700 (Sulfur Copper) | Cu + 0.20-0.70% S | ≥ 90% - 95% | 85% | 250 - 360 |
| C14500 (Tellurium Copper) | Cu + 0.40-0.70% Te | ≥ 93% - 98% | 85% | 250 - 380 |
| C11000 (ETP Copper) | Cu ≥ 99.90% | 101% | 20% | 220 - 300 |
| C36000 (Leaded Brass) | Cu + 2.5-3.7% Pb + Zn | 26% | 100% | 340 - 470 |
Tailored copper alloy solutions for regional utility, infrastructure, and transport operations.
Upgrades to substation connectors, switchgear components, and transformer terminals. High conductivity prevents heat build-up under high current loads.
High-conductivity C14700 pins and sockets support Rwanda's growing electric motorcycle and light EV charging networks in Kigali.
Precision-machined copper nozzles, valve stems, and connectors for smart crop irrigation systems and food processing facilities.
High-reliability switchgear contacts and heavy-duty busbars designed for hydropower stations along the Nyabarongo and Rusumo rivers.
Precision RF coaxial connectors and wave-guide terminals supporting telecom network expansions and digital infrastructure initiatives.
Low thermoelectric voltage connectors used in precise measuring instruments and electrical calibration laboratories.
Combining custom chemical formulation with advanced oxygen-free vacuum melting processes.
Our R&D program focus includes oxygen-free high-conductivity tellurium copper and clean sulfur copper variants. These materials provide optimized machinability while protecting high-voltage distribution systems from trace lead hazards.
Vertical continuous casting systems maintain uniform alloy element dispersion throughout the copper matrix.
Proprietary deoxidation methods limit oxygen levels to under 10 ppm, minimizing hydrogen embrittlement risks in hot-working zones.
Production facilities are fully certified under ISO 9001:2015, ISO 14001:2015, and ISO 45001:2018 standards.
Shipping raw metal billets, bars, profiles, and wires to landlocked Rwanda requires a coordinated logistics strategy. Sichuan Kepai works with established transport links through key corridors to provide reliable delivery times:
Our engineering support desk offers online technical consultations to help Rwandan machine shops optimize tool geometry, feed rates, and coolant selections for machining C14700 and C14500 copper alloys.
Conforming to strict international directives (RoHS, REACH) and ISO manufacturing guidelines.
Answers to common questions about selecting, processing, and importing specialty copper alloys.
Yes. C14700 Sulfur Copper offers good solderability and brazing characteristics. However, caution must be exercised during gas-shielded arc welding because sulfur content can cause hot shortness in weld pools. For heavy structural welding applications, chromium-zirconium copper (C18150) or pure deoxidized copper is recommended.
Both alloys share an 85% machinability rating and high conductivity. The choice often depends on region-specific alloy usage and local industry preferences. Tellurium copper is widely used in precision plasma cutting torch nozzles and premium connectors, whereas sulfur copper is often selected for mass-produced automatic screw machine parts due to supply stability.
Yes. Sichuan Kepai manufactures round bars, hexagonal rods, square bars, custom extruded profiles, and heavy-gauge wire rolls. Custom profiles help reduce machining waste and cycle times for production lines in Kigali.
MOQs vary depending on the alloy type, form, and diameter size. For standard stock items, we support trial shipments to Kigali. Custom profile requests generally require a minimum batch run. Contact our sales desk for a detailed quote.
The copper sulfide inclusions form weak planes within the metal matrix. Under shear stress from a cutting tool, these inclusions break up the chips, reducing friction at the tool tip and keeping cutting temperatures lower. This extends the service life of HSS and carbide tools.
Yes. Our sulfur copper (C14700) and tellurium copper (C14500) alloys provide excellent, lead-free alternatives to traditional free-cutting leaded brasses, helping clients meet environmental compliance standards.
Explore our complete range of high-strength, high-conductivity copper and brass materials.
Widely recognized for outstanding machinability. Perfect for lock cores, gear systems, valve bodies, and components produced at high volumes.
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Provides low friction coefficients, high elastic strength, and good wear resistance. Suitable for bushings, wear plates, and small gear assemblies.
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Excellent fatigue strength and spring qualities. Used primarily in electronic switches, spring contacts, and flexible connectors.
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Excellent cold working ductility. Recommended for stamping components, deep-drawn shells, and complex decorative metalware.
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A precipitation-hardened copper-nickel-silicon-phosphorus alloy offering high strength, good conductivity, and relaxation resistance.
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Engineered for electrical connectors, EV charging terminals, and smart grid switchgear that require high current capacity.
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Self-lubricating characteristics and load-bearing performance. Suitable for heavy industrial machinery bushings and slides.
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Offers high yield and tensile strength among copper alloys after heat treatment. Designed for precision spring clips and switch contacts.
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