Explore our core selection of high-performance copper alloys tailored for demanding structural, electrical, and thermal engineering applications.
C5190 (UNS C51900 / CuSn6) represents the upper tier of commercial tin bronze alloys, fortified with a precisely controlled phosphorus addition. Its metallurgical architecture is engineered to balance high elastic limits, excellent wear characteristics, and superior fatigue endurance.
By containing approximately 6% tin (Sn), C5190 benefits from solid-solution strengthening, which substantially raises its yield and tensile strength compared to low-tin bronzes (such as C51100). The addition of 0.03% to 0.35% phosphorus acts as a powerful deoxidizing agent during smelting and refines the microcrystalline grain boundaries. This prevents intergranular corrosion and forms hard tin-phosphide compounds that enhance structural wear resistance.
Unlike standard copper formulations, C5190 excels under cyclic stress conditions. It displays a high spring-back properties combined with an outstanding fatigue ratio, making it the premier material of choice for electronic connectors, spring plates, and mechanical bushings operating in highly repetitive environments.
| Property Group | Value Parameter (C5190 / CuSn6) | Industrial Impact |
|---|---|---|
| Chemical Composition | Sn: 5.5-7.0% | P: 0.03-0.35% | Cu: Bal. | Corrosion and oxidation immunity |
| Electrical Conductivity | ~15% IACS (International Annealed Cu) | Reliable current carrying capacity |
| Tensile Strength (MPa) | 480 - 750 (Depending on Temper) | High yield load structural resilience |
| Elastic Modulus | 115 GPa | Superior spring performance |
Chinese advanced metallurgy has transformed from bulk processing to ultra-precision structural customization. Sichuan Kepai New Material Co., Ltd. leads this progression.
Sichuan Kepai leverages direct access to high-purity electrolytic copper cathodes and advanced alloying elements in southwest China. This raw material security ensures stable pricing, minimal contaminant profiles (low Pb, Fe, and Zn traces), and consistent physical properties across massive industrial batches.
We provide tailormade extrusion, cold drawing, and hardening schedules to output C5190 sheets, rods, and wires matching unique client drawings. From soft-annealed tempers to extra-hard spring tempers, Kepai calibrates thickness tolerances down to ±0.005mm.
Established in 2017 with an active 9,000 sqm industrial factory and a dedicated 1,000 sqm R&D hub in Sichuan, our metallurgical output complies fully with ASTM B139, EN 12163, and JIS H3250 standards, ensuring seamless structural integration in global markets.
Sichuan Kepai New Materials Co., Ltd. integrates environmental responsibility directly into the smelting pipeline. Located in the western area of the Sichuan Guanghan Industrial Development Zone, adjacent to National Highway 108, our infrastructure ensures optimal transport logistics while reducing fossil fuel footprints. By implementing high-efficiency induction melting furnaces, closed-loop scrap recycling, and rigorous air filtration systems, we align with the strategic emerging new materials roadmap.
Sichuan Kepai operates on structured divisions designed to guarantee product traceability from casting to distribution.
Technological innovation is the core competitiveness of Sichuan Kepai New Materials Co., Ltd. The company has a research and development and production team composed of senior industry experts who keep pace with international cutting-edge technology trends and continuously explore the unknown boundaries in the field of new copper alloy materials. Through a combination of independent research and development and industry-university-research collaboration, Kepai has made breakthrough progress in several areas, including high-performance tellurium copper, lead copper, and sulfur copper.
Kepai's product line is rich and diverse, covering a comprehensive range of solutions from basic materials to high-end customization. We focus on providing customers with high-performance, high-quality high-end copper alloy products, including but not limited to pure copper, oxygen-free copper, oxygen-free high-conductivity tellurium copper, nickel tellurium copper, tin bronze, beryllium copper, lead bronze, sulfur copper, and chromium zirconium copper. These products play an important role in reducing production costs and enhancing performance.
In the face of global market competition, Sichuan Kepai New Materials adheres to the development strategy of "rooted in Sichuan, radiating nationwide, and moving towards the world." By continuously optimizing market layout and improving the sales network, we have established a stable customer base in multiple provinces and cities across the country and have formed long-term cooperative relationships with several internationally renowned enterprises. At the same time, we actively expand overseas.
We understand that the long-term development of an enterprise is inseparable from an excellent corporate culture. We advocate the corporate spirit of "integrity, innovation, collaboration, and win-win," encouraging employees to explore boldly and innovate courageously, while also emphasizing teamwork and talent cultivation, striving to create a harmonious, open, and inclusive work atmosphere. We believe that only by continuously pursuing excellence and creating value can we win the trust of customers and the respect of society.
Our raw materials and manufacturing lines undergo rigorous independent audits to meet standard regulatory compliance certificates.
From microelectronics to grid-scale power management, our C5190 copper alloy supports crucial modern infrastructure.
High-voltage battery management systems (BMS) require busbars and relay springs capable of handling elevated temperatures while retaining mechanical structural pressure. The elevated creep resistance of C5190 ensures reliable mechanical contact over the vehicle's entire operational lifespan.
5G antenna modules, high-frequency coaxial connectors, and micro-switches rely heavily on copper components with narrow dimensional tolerances and high spring performance. C5190 provides precise stamped geometries and excellent conductivity without signal degradation.
Operating in environments exposed to extreme heat and abrasive particulate matter, wear parts manufactured from custom C5190 display longer operational life cycles than standard bronze types, limiting downtime for factory maintenance operations.
Our workshop houses high-tonnage drawing, precision straightening, and metallographic composition validation machines.
Smelting Furnace
Laying-off Line
Extrusion Press
Drawing Machine
Straightening Machine
Package Station
Eddy Current Conductance
Composition Test Room
Metallographic Polisher
Universal Testing Machine
LCD Universal Tester
Hardness Tester
With the transition to electrification, smart grids, and electric mobility, the worldwide consumption of specialized bronze alloys is experiencing substantial growth.
Modern industrial equipment demands longer warranty cycles. Standard brass alloys are increasingly replaced by C5190 and C5210 phosphor bronzes to mitigate stress relaxation challenges in spring contacts and connectors.
European and American regulatory systems impose severe restrictions on lead leaching. Our low-lead and lead-free C5190 compositions ensure that manufacturers exporting to these highly regulated regions maintain environmental compliance without sacrificing performance.
With hardware footprints shrinking in high-density devices, metal components must be thinner while maintaining equivalent spring forces. This drives the demand for high-uniformity, high-temper C5190 strips that can withstand acute bending angles without cracking.
Find answers to critical technical and logistical questions asked by global procurement professionals and design engineers.
From highly conductive tellurium copper to robust beryllium alloys, select the ideal chemical and structural composition for your next application.
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