Explore our highly-conductive, wear-resistant, and high-tensile copper alloy products optimized for complex manufacturing demands.
Understanding the balance between extreme mechanical strength, high electrical conductivity, and the critical parameters of micro-precision subtractive manufacturing.
Beryllium Copper (often referred to as copper beryllium, CuBe, beryllium bronze) exhibits a unique combination of qualities that are unmatched by other metal alloys. Composed of copper with beryllium content typically ranging from 0.4% to 2%, it responds remarkably well to precipitation and age-hardening processes. The most widely utilized grade, C17200 (Alloy 25), is highly valued for achieving tensile strengths exceeding 1400 MPa, with hardness levels up to 40 HRC. Crucially, it retains up to 60% of pure copper's electrical conductivity (IACS), making it the ultimate material for critical conductive applications subject to high mechanical stress.
The transformation occurs during thermal aging (typically around 315°C / 600°F). Small, coherent beryllium-rich GP zones precipitate within the copper matrix, causing localized lattice strain. This strain blocks dislocation movement, translating directly into high fatigue strength, resistance to thermal relaxation, and superior wear dynamics.
However, from a CNC machining perspective, this remarkable strength and tendency to work-harden makes Beryllium Copper significantly more difficult to process than standard brass or free-cutting copper alloys. Machining factories must use specialized high-hardness carbide or PCD (Polycrystalline Diamond) tooling, precise spindle feed parameters, and continuous flood coolant to prevent both thermal stress and the formation of hazardous beryllium-containing airborne particles.
| Alloy Grade | Beryllium Content (%) | Tensile Strength (MPa) | Electrical Conductivity (% IACS) | Primary Industrial Use Case |
|---|---|---|---|---|
| C17200 (Alloy 25) | 1.8 - 2.0% | 1200 - 1450 | 20 - 25% | Heavy-duty springs, aerospace bushings, downhole drilling tools, relays |
| C17300 (Free-Machining) | 1.8 - 2.0% (+ Lead) | 1200 - 1450 | 20 - 25% | High-precision CNC machined electronic connectors, micro-switches |
| C17500 (Alloy 10) | 0.4 - 0.7% | 680 - 950 | 45 - 60% | Resistance welding electrodes, power transmission connectors |
| C17510 (High Conductivity) | 0.2 - 0.6% | 700 - 960 | 45 - 60% | High-performance electrical switchgear, heat sinks, injection mold cores |
Established in 2017, Sichuan Kepai New Materials Co., Ltd. is a state-level high-tech enterprise that integrates research, development, production, and high-precision sales of specialized, high-performance copper alloys. Strategically located in the western area of the Sichuan Guanghan Industrial Development Zone, adjacent to National Highway 108, our operations benefit from rapid logistics networks and supply-chain integration.
We focus directly on strategic emerging materials, contributing to the development of next-generation physical infrastructures. With advanced manufacturing processes, Kepai designs, smelts, and machines strategic copper variants including tellurium copper, lead bronze, oxygen-free high-conductivity copper, and high-conductivity beryllium copper. These materials play critical roles in 5G communications, NEVs, precision plasma equipment, and advanced aerospace technologies.
Technological innovation is the core engine driving Sichuan Kepai. Our R&D and engineering production teams are comprised of senior metallurgists and CNC manufacturing experts who continuously push the limits of copper alloy performances. Through a deliberate combination of independent innovation and academic collaboration with leading metallurgy research institutes, Kepai has achieved international standards in oxygen-free tellurium copper, easy-to-cut lead bronze, and high-purity sulfur copper alloys. Our solutions actively replace imports in heavy-duty energy applications, plasma arc torches, and aerospace assemblies.
Our product matrix covers both basic raw materials (bars, plates, wires, and tubes) and advanced, custom-machined finished components. We specialize in producing custom electrical contacts, connector pins, welding nozzles, and wear-resistant bushings. Key materials include pure copper, oxygen-free copper, nickel tellurium copper, tin bronze, beryllium copper, sulfur copper, and chromium zirconium copper. By optimizing the material structures, we help our clients lower production costs while improving thermal dissipation, longevity, and electrical efficiency.
Rooted in Sichuan, radiating nationwide, and serving global industries.四川科派 (Sichuan Kepai) has built robust supply channels across North America, Europe, East Asia, and South America. We participate directly in international engineering trade shows, ensuring close collaboration with global purchasing agents. By offering tailored logistical shipping and customized specifications, we serve as a reliable OEM/ODM vendor to multi-national entities requiring consistent high-volume manufacturing output.
Why sourcing custom machined copper alloys from specialized Chinese manufacturers like Sichuan Kepai provides distinct economic, technical, and supply chain benefits.
Unlike western machine shops that purchase raw copper alloys from third-party distributors at high premiums, Kepai integrates raw material smelting, continuous casting, extrusion, and precision CNC finishing under one roof. This minimizes material waste and lead times.
Chinese factories deploy advanced CNC machining centers (including 5-axis mills and multi-spindle Swiss lathes) designed specifically for difficult-to-cut alloys. This machinery achieves tight tolerances of up to ±0.005 mm at low per-unit costs.
Modern facilities utilize closed-loop filtration, mist extraction systems, and wet machining processes. This ensures complete environmental safety during beryllium processing, fully complying with international RoHS, REACH, and ISO certifications.
From primary material smelting to multi-axis drawing and state-of-the-art metallurgical verification, our process is monitored at every stage.
Smelting Process
Laying-Off / Cutting
Hot Extrusion
Cold Drawing
Precision Straightening
Heavy Duty Packaging
Eddy Current Conductance Test
Chemical Composition Test Room
Metallographic Polishing
Universal Testing Machine
LCD Electronic Testing Machine
Precision Hardness Tester
How Beryllium Copper parts and copper alloys address high-demand operational environments across sectors.
Modern electric vehicles demand high-current charging and dependable battery management systems (BMS). Copper alloys such as C17200 and C14500 (tellurium copper) are used in high-voltage connectors, contacts, relays, and busbars. Their high electrical conductivity and resistance to thermal relaxation under load prevent electrical resistance spikes and terminal failures, ensuring safety during rapid charging cycles.
5G micro-base stations require high signal integrity and low attenuation. Precision-turned copper alloy contacts are essential components in coaxial connectors and RF modules. Beryllium copper's spring properties and fatigue resistance ensure that sub-millimeter connector pins maintain constant contact pressure over millions of insertion cycles without deformation.
Aerospace landing gear assemblies, downhole oil drilling shafts, and actuator assemblies face high mechanical loads and corrosive environments. Beryllium copper is non-sparking and self-lubricating when paired with steel, making it ideal for safety critical bushings and non-magnetic components. Its high resistance to galling ensures trouble-free performance under mechanical stress.
High-powered laser cutting heads and gas metal arc torches require consumables with high thermal transfer properties. Sichuan Kepai supplies high-conductivity oxygen-free tellurium copper alloys that are machined into contact tips, nozzles, and gas diffusers. These alloys maximize service life by resisting erosion from heat arcs.
Sichuan Kepai operates strictly under international quality management systems to guarantee compliance with global sourcing standards.
A strategic overview of the demands placed on manufacturing partners by international procurement teams, and where the market is headed.
In high-tech sectors, procurement groups evaluate vendors using strict quality control criteria. Material traceabilty is primary; manufacturers must supply certified heat numbers, material test reports (MTR), and chemical composition profiles. Dimensional compliance is strictly verified through automated CMM (Coordinate Measuring Machine) inspections. Additionally, compliance with RoHS (Restriction of Hazardous Substances) and REACH directives is mandatory. These standards ensure that any trace lead or heavy metals present fall well within legal limits, avoiding custom clearance disruptions at international borders.
The market is shifting toward miniaturization and higher power transmission. In consumer electronics and automotive sectors, the spacing on terminal connectors continues to shrink, requiring ultra-precise machining of pins down to 0.1 mm in diameter. To support this, factories are transitioning from conventional lathes to ultra-high-speed CNC Swiss turn-mill centers. Additionally, environmental restrictions on beryllium dust have led to the development of alternative high-strength alloys (such as copper-nickel-tin spinodal alloys). Nevertheless, Beryllium Copper remains irreplaceable for applications requiring maximum spring properties, thermal stability, and electrical performance.
Professional engineering answers regarding Beryllium Copper properties, manufacturing, safety, and order fulfillment.
The machinability rating depends heavily on the heat treatment state. In the annealed state (A or TB00), it has a rating of approximately 20-30% of free-cutting brass (C36000). For free-machining variants like C17300, which contain trace lead, the machinability index increases to around 50-60%. Once fully age-hardened to HRC 36-40, machinability drops, requiring rigid setups, carbide tooling, and low cutting speeds to prevent premature tool wear.
Machining solid beryllium copper is safe. However, inhaling fine dust, fumes, or mists containing beryllium can lead to a lung condition called Chronic Beryllium Disease (CBD). Sichuan Kepai maintains strict industrial safety protocols: we employ continuous wet flood cooling to prevent dust formation, and our CNC equipment is connected to localized mist collectors and air filtration systems, ensuring that airborne particulate concentrations remain well below international safety limits.
C17300 is chemically identical to C17200 but includes a small addition of lead (0.2% to 0.6%). This addition acts as a chip-breaker, significantly improving chip clearance during high-speed CNC operations. For complex swiss-type machined contacts, sensor pins, and micro-terminals, C17300 is preferred as it extends tool life and provides a superior surface finish (Ra < 0.8 microns).
Yes, we provide complete, post-machining heat treatment services. For parts that require intricate forming or machining, we process the material in the ductile, solution-annealed state. Once the final geometries are completed, the parts undergo thermal aging in vacuum furnaces to achieve target tensile strength and hardness specifications, avoiding oxidation on critical mating surfaces.
Typical lead times range from 2 to 4 weeks for prototyping and tooling setup, and 4 to 6 weeks for production-level batches. Because Sichuan Kepai casts and extrudes its own raw materials, we can bypass external material delays and adjust production schedules to accommodate urgent client timelines.
Looking ahead, Sichuan Kepai New Materials Co., Ltd. will continue to uphold its original intention, with even greater enthusiasm and determination, to engage in research and application in the field of new materials, contributing to the development of the new copper alloy materials industry in China and globally. We look forward to working hand in hand with friends from all walks of life to create a brilliant future together!
Our complete range of high-performance tellurium copper and custom-cut sulfur bronze alloys ready for immediate global distribution.
Kepai
