Explore our core product lineup of specialty copper alloys designed for demanding industrial applications.
Established in 2017, Sichuan Kepai New Materials Co., Ltd. is a cutting-edge high-tech enterprise dedicated to the research, development, manufacturing, and distribution of special high-conductivity copper alloys. Strategically located in the western area of the Sichuan Guanghan Industrial Development Zone, adjacent to National Highway 108, our facility ensures rapid domestic and international shipping logistics.
Our operation aligns directly with critical global demand for strategic, emerging high-performance materials. We specialize in producing Tellurium Copper, High-Conductivity Oxygen-Free Copper, Silver Copper, and Dispersion-Strengthened Copper. These advanced metallurgical solutions serve high-precision fields such as electric vehicle charging networks, 5G signal equipment, plasma/laser cutting assemblies, and high-amperage relays.
Understanding why C18150 (CrZrCu) is the industry standard for high-temperature electrical applications.
Chromium Zirconium Copper (UNS C18150 / ISO CuCr1Zr) is a high-strength, high-conductivity alloy specifically designed to maintain its mechanical integrity under high thermal and physical stress. By leveraging the principles of precipitation hardening, our manufacturing process introduces controlled distributions of chromium and zirconium elements within the copper matrix. This micro-structural engineering enables the material to resist softening at elevated temperatures, far outperforming pure copper variants (such as C11000 or C10200) without significantly sacrificing electrical and thermal conductivity.
The addition of chromium (typically 0.5% to 1.5%) facilitates the formation of secondary phase precipitates during heat treatment, which lock dislocation movements and enhance hardness. The addition of zirconium (typically 0.05% to 0.25%) further raises the recrystallization temperature, preventing grain growth and subsequent mechanical failure during heavy welding runs or continuous contact applications.
| Property Parameter | C18150 (CrZrCu) Nominal Value | Industrial Relevance / Benefit |
|---|---|---|
| Electrical Conductivity | ≥ 80% IACS (up to 85% typical) | Minimizes resistive heating, vital for EV high-voltage connectors and welding tips. |
| Thermal Conductivity | 320 - 350 W/(m·K) @ 20°C | Accelerates heat dissipation, extending life cycle in continuous casting molds. |
| Tensile Strength (UTS) | 450 - 550 MPa (depending on temper) | Resists deformation under high clamping force and operational mechanical pressure. |
| Hardness | 75 - 85 HRB (130 - 160 HV) | Provides wear resistance against physical friction and electrical erosion. |
| Softening Temperature | 500°C | Prevents metallurgical annealing and loss of mechanical strength in high-heat zones. |
When compared to binary alloys like C18200 (Chromium Copper), C18150 features superior anti-adhesion characteristics when welding galvanized steels, making it the preferred choice for automotive manufacturing lines globally. The zirconium addition forms a thermal barrier layer that restricts the diffusion of zinc into the electrode, significantly reducing electrode sticking and wear rates.
How our custom-formulated C18150 alloys empower global heavy industries and next-generation technologies.
Widely utilized as resistance spot welding electrodes, seam welding wheels, and electrode holders, particularly for joining high-strength steels and galvanized sheets.
Used in high-current charging pins, male-female battery terminals, and busbars that demand continuous, low-loss energy transfer under elevated temperatures.
Employed in mold plates for steel production, crystallization liners, and slag notch assemblies, where rapid heat removal is critical to prevent thermal cracking.
Ensuring consistent dimensional accuracy, chemical purity, and delivery speed through automated production pipelines.
In the specialized copper alloy sector, stability is the cornerstone of reliability. Sichuan Kepai integrates Industry 4.0 paradigms within our 9,000 square meter factory floor. Our production utilizes continuous upward casting equipment, vacuum induction furnaces, and high-tonnage extrusion presses. By automating heat treatment stages (solution annealing followed by age hardening), we guarantee that every batch of C18150 CrZrCu copper exhibits uniform precipitate distribution and isotropic physical properties.
Furthermore, our regional positioning in Sichuan grants access to raw materials and stable clean energy resources (hydropower), resulting in a lower carbon footprint for our copper smelting operations. This cost efficiency is passed directly to our global customers, while ensuring an unbroken supply chain free from localized energy disruptions.
Rooted in innovation, quality, and global reach.
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.
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.
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.
From smelting to rigorous composition testing, our equipment ensures high purity and uniform grain structures.
Smelting
laying-off
extrusion
drawing
straightening
package
eddy current conductance instrument
Chemical composition test room
Metallographic polishing machine
Electro-hydraulic servo testing machine
Electronic universal testing machine
Hardness tester
Our materials comply with rigorous international testing, ensuring maximum process safety.
Crucial procurement steps for global supply chain managers sourcing C18150 alloys.
Purchasing professional-grade C18150 CrZrCu copper requires deep attention to chemical analysis and metallurgical history. We advise procurement officers to verify three key parameters during the RFQ process:
Sichuan Kepai provides full material traceability reports with every dispatch, including chemical composition data sheet, density validations, and electronic conductivity (IACS%) test results.
Pioneering the next boundaries of copper alloy research for future tech paradigms.
As microelectronics shift to smaller nodes and electric vehicles demand mega-watt charging thresholds (MCS), the boundaries of traditional C18150 are constantly being challenged. Our R&D division is focused on three future-focused areas:
Developing tertiary elements and minor micro-doping methods to raise the softening limits of chromium-zirconium matrices above 550°C without losing high-conductivity.
Advancing multi-axial forging mechanisms to minimize structural variance in larger copper shapes, guaranteeing equal load carrying in all axes.
Building high-purity recycling loop pipelines that reclaim process scrap, cleaning impurities while keeping energy footprints low.
Clear technical answers to common engineering and sourcing questions regarding C18150 CrZrCu.
C18150 contains zirconium (0.05% - 0.25%) in addition to chromium, whereas C18200 contains only chromium. The inclusion of zirconium provides C18150 with a higher softening temperature, better wear resistance, and reduced tendency to stick to workpieces (especially galvanized sheet steel) during resistance welding.
The alloy is first solution heat-treated at a high temperature (around 900-950°C) where chromium and zirconium dissolve into the copper matrix. It is then rapidly water quenched. Afterwards, the material is aged at a lower temperature (typically 450-500°C) to allow sub-microscopic particles of Cr and Zr compounds to precipitate, drastically increasing hardness and strength while maintaining high electrical conductivity.
Due to its high softening temperature (500°C) and wear resistance, C18150 electrodes keep their geometry under the intense pressure and high current density of spot welding lines. It resists zinc contamination from coated steels, which otherwise degrades standard copper electrodes rapidly.
We supply C18150 in various semi-finished formats, including round bars, hexagonal bars, rectangular plates, welding discs, customized forgings, and seamless tubes. Custom sizes can be manufactured based on drawings and technical requirements.
Additional specialized copper alloys manufactured to global specifications.
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!
Kepai
