In modern industrial manufacturing, the demand for materials that balance high electrical conductivity with mechanical ease of processing has reached unprecedented levels. Historically, electrical engineering relies on high-purity copper, which suffers from low machinability due to its soft and gummy nature. While traditional leaded brass (such as C36000) provides high-speed cutting parameters, its environmental drawbacks and significantly reduced electrical conductivity (~26% IACS) make it unsuitable for high-efficiency electrical interconnects.
This is where C14700 Sulfur Copper (UNS C14700) emerges as the definitive solution. By alloying copper with a micro-addition of sulfur (typically 0.20% to 0.50%), metallurgists introduce a dispersed phase of copper sulfide (Cu2S) within the copper matrix. These microscopic particles act as natural chip breakers during machining operations, elevating the machinability rating of the alloy to 85% (relative to Free-Cutting Brass at 100%). Crucially, this enhancement does not degrade electrical properties, preserving an electrical conductivity of at least 90% to 95% IACS.
As a leading OEM sulfur copper alloy supplier, exporter, and manufacturing company, Sichuan Kepai New Materials Co., Ltd. produces optimized grades of C14700 that meet the stringent tolerances required in high-frequency signal transmission, electric vehicle charging infrastructures, aerospace engineering, and automated production lines.
Established in 2017, Sichuan Kepai New Materials Co., Ltd. has developed into a top-tier Chinese high-tech enterprise dedicated to research, manufacturing, and global distribution of specialized strategic copper alloys. Situated in the western sector of the Sichuan Guanghan Industrial Development Zone, adjacent to National Highway 108, our site leverages rapid logistics corridors to serve local and international markets efficiently.
At Sichuan Kepai, technical strength is structured around independent chemical composition analysis and custom casting practices. Our dedicated metallurgists collaborate with key domestic institutes to explore specialized micro-alloying processes. We optimize sulfur distribution in the C14700 copper structure to eliminate hot shortness while achieving clean mechanical chip breaking. This enables OEM manufacturers of electrical pins and connectors to maximize machine runtime with minimum tooling replacements.
Our product landscape encompasses the complete hierarchy of specialized high-conductivity and high-strength alloys. In addition to C14700 sulfur copper, Kepai manufactures tellurium copper (C14500), high-strength chromium-zirconium copper (C18150), beryllium copper (C17200, C17500, C17510), pure copper (C11000), and lead bronze. This ensures global procurement directors can source all precision electrical metal requirements from a single, audited partner, lowering supply chain complexity and logistics overheads.
| Alloy Grade (UNS) | Electrical Conductivity (IACS %) | Machinability Rating | Tensile Strength (MPa) | Key Elements |
|---|---|---|---|---|
| C14700 (Sulfur Copper) | 90 - 95% | 85% | 250 - 380 | Cu: 99.6%, S: 0.2-0.5% |
| C14500 (Tellurium Copper) | 93 - 98% | 85% | 250 - 390 | Cu: 99.5%, Te: 0.4-0.7%, P: 0.008% |
| C18150 (Cr-Zr-Cu) | 80 - 85% | 20% | 450 - 550 | Cr: 1.0%, Zr: 0.15%, Cu: Bal |
| C17200 (Beryllium Copper) | 22 - 28% | 20% | 1100 - 1300 | Be: 1.8-2.0%, Cu: Bal |
| C36000 (Leaded Brass) | 26% | 100% | 340 - 470 | Cu: 61.5%, Pb: 3.0%, Zn: Bal |
Sichuan Kepai’s manufacturing paradigm aligns with the "China Factory 4.0" framework. Our 9,000 m² production floor leverages automated control over critical phase transitions, from cold charging to vacuum smelting and horizontal continuous casting. This high-efficiency tooling architecture minimizes heat variation, which is critical for securing a homogeneous distribution of sulfur in sulfur copper alloys.
Due to the geopolitically stable location of Sichuan and our direct access to high-purity copper cathodes locally, Kepai acts as a resilient buffer against global raw material volatility. Our continuous casting technology, paired with rigorous energy conservation protocols, guarantees high-yield outputs. This enables us to maintain pricing stability and short lead times, even amidst macro-economic supply shocks in Western copper processing hubs.
Achieving dimensional consistency and precise chemical integrity in special copper alloys requires a specialized manufacturing process. Below is the workflow and testing suite employed at our Sichuan factory to ensure every exported batch meets international standards (ASTM B301, B224, etc.).
Smelting Furnace
Laying-off Machine
Extrusion Press
Cold Drawing Bench
Straightening Equipment
Export Protective Packaging
Eddy Current Conductance
Chemical Composition Lab
Metallographic Polisher
Universal Testing Machine
Universal Testing Machine
Hardness Tester
Our optimized sulfur-copper alloys are critical components in primary global engineering verticals. By shifting to Kepai's C14700, industries achieve a significant gain in power efficiency and manufacturing yield.
EV charging connectors, high-voltage relays, and battery terminal components require continuous current flow without localized resistive heating. C14700's high IACS conductivity (>90%) keeps temperature rises within limits, while its high machinability allows for the cost-effective mass production of intricate terminal pins.
Coaxial connectors and micro-wave communication system housings require precise dimensional tolerances. The high-speed thread-cutting performance of sulfur copper ensures smooth component finishes and burr-free edges, keeping signal losses to a minimum.
Laser contact tips and welding nozzles operating under extreme thermal fluxes must dissipate heat rapidly. C14700’s high thermal conductivity ensures these consumable tips have a longer lifespan, reducing maintenance downtime for factory operators.
Sichuan Kepai is committed to advancing copper metallurgy. Our R&D roadmap is focused on three strategic pillars to support the evolving demands of our global partners:
By controlling residual oxygen levels below 5 ppm during chemical formulation, we aim to prevent hydrogen embrittlement. This allows us to produce high-purity, sulfur-doped copper alloys with stable conductivity levels approaching 98% IACS.
As RoHS and REACH regulations tighten globally, lead elimination is a high priority. C14700 is a compliant alternative to leaded brasses. Our research focuses on refining sulfur distribution to replicate leaded brass machinability at high production speeds.
Through advanced cold-working and drawing schedules, we are developing sulfur-copper rods with higher tensile strength and surface hardness. These improvements will support high-wear applications like contact terminals and automated spring-loaded contacts.
Exporting high-value copper alloys requires rigorous adherence to local regulations.四川 Kepai New Materials operates a global export structure, ensuring that all international shipping configurations, customs clearances, and material safety compliance certificates are managed by our logistics specialists.
Our quality management systems conform to ISO 9001, RoHS, and REACH criteria. Every batch of sulfur copper shipped from our Sichuan facilities comes with a comprehensive material test report (MTR) detailing exact spectrographic chemical compositions, tensile tests, hardness levels, and IACS electrical measurements. We maintain partnerships with regional logistics providers in the EU, Americas, and East Asia, assuring timely delivery to OEM manufacturing sites worldwide.
International procurement of technical copper alloys must balance unit price with material reliability. At Sichuan Kepai, we address these procurement challenges directly through tailored OEM solutions:
We provide sulfur copper in a wide variety of profile configurations, including round, hexagonal, and square rods, as well as customized plates, wire spools, and custom-extruded profiles. This reduces preprocessing machining steps and scrap rates for end manufacturers.
By leveraging our 9,000 m² factory footprint and raw material stockpiles, we support small-batch prototype runs as well as high-volume contracts. This flexibility helps our partners minimize capital tie-up during testing phases.
Get in touch with Sichuan Kepai's engineering team to discuss custom sizes, chemical profiles, or request a volume quotation for C14700 Sulfur Copper.
Kepai
