Sichuan Kepai New Materials Co., Ltd. is a global technological leader in the research, development, continuous casting, and precision extrusion of advanced copper alloys. Specialized in manufacturing high-conductivity, high-strength free-cutting tellurium copper, oxygen-free copper, beryllium cobalt copper, and high-performance wear-resistant lead bronze, Kepai has positioned itself as a critical supplier for high-end manufacturing.
Leveraging our state-of-the-art 29,000-square-meter facility, we integrate raw material smelting, micro-alloying, sophisticated heat treatment, and precision testing to deliver metallurgical consistency. Our intellectual properties feature over 30 patents, ensuring our global clientele receives structurally sound alloys designed for critical failure-free performance.
In heavy industrial, high-velocity, and boundary lubrication environments, standard brasses and basic bronzes often fail due to severe adhesive wear. To prevent catastrophic failure, engineers deploy high-performance lead bronze alloys (such as C93200 SAE 660, C93700 SAE 64, and C93800). The unique metallurgical configuration of these materials relies on the immiscibility of lead within the copper matrix. During our continuous casting process, the lead phase separates from the solidifying copper-tin dendrites and forms a highly dispersed, microscopic emulsion.
The metallurgical matrix contains tin as a solid solution strengthener, which elevates the mechanical hardness, yield strength, and fatigue resistance of the bronze. In contrast, the dispersed lead particles function as built-in safety reservoirs. If the oil pressure drops or the system experiences boundary contact, the microscopic lead film prevents metal-to-metal welding (seizure). This ensures the continuous operation of highly loaded shafts and high-speed bearings.
When evaluating materials for bearing bushes, slide plates, or high-pressure hydraulic components, it is critical to compare mechanical performance indicators. The table below represents standard metrics recorded for Kepai’s advanced lead bronze formulations against typical copper alloys:
Our lead bronze alloys exhibit a tensile strength exceeding 300 MPa, with a compressive yield strength capable of supporting static loads up to 120 MPa. The Brinell hardness ranges dynamically between 75 and 110 HB. More importantly, under un-lubricated or low-lubricated sliding tests, the wear rate remains under 1.2 × 10⁻⁷ mm³/N·m, illustrating superior reliability compared to standard phosphor-bronze.
The global demand for high-grade lead bronze is driven by heavy machinery, energy generation, high-speed rail networks, and heavy maritime transport. Geographically, industrial demand is concentrated in North America, Western Europe, and East Asia. Factories in these regions require consistent material quality with minimal deviations in copper-to-lead ratios to prevent early micro-cracking in bearing assemblies.
As a leading developer and exporter, Sichuan Kepai maintains a stable supply chain network that bridges this global demand. Leveraging our robust shipping and compliance logistics, we regularly export raw billets, semi-finished hollow bars, and fully machined components to OEM industrial firms worldwide. In domestic and overseas markets, Kepai’s brand stands for high wear resistance, microstructural consistency, and structural dependability.
Figure 1: Kepai’s Global Export and Distribution Network spanning North America, Europe, and Asia-Pacific.
Exporting copper-lead alloys requires strict adherence to international regulatory frameworks. To maintain our standing as a top exporter, Kepai operates in full alignment with global standards, including ISO 9001:2015 for quality management, ISO 14001:2015 for environmental protection, and ISO 45001:2018 for occupational safety.
Furthermore, we proactively address environmental directives such as RoHS and REACH. When our leaded products are utilized in specific heavy-duty segments (e.g., aerospace and defense, railway traction motors, or marine gear units) that are granted environmental exemptions, we supply comprehensive metallurgical traceability, chemical analyses, and mechanical test certifications. This documentation ensures seamless compliance and smooth customs clearance at all destination ports.
The metallurgical sector is experiencing two primary transitions: the reduction of carbon emissions during raw extraction and the demand for environmentally compliant tribological materials. The global market is gradually shifting toward low-lead or micro-alloyed alternatives that achieve high sliding reliability without sacrificing recyclability. In addition, modern automated machinery requires longer component life and reduced maintenance cycles.
Kepai is actively addressing these industry needs. Our research and development team is exploring micro-alloying techniques that integrate trace amounts of bismuth, tellurium, and sulfur with copper matrix structures to develop alternative wear-resistant solutions. By optimizing the distribution of self-lubricating phases, we help customers balance high efficiency with environmental compliance.
To maintain our technological edge in the international copper alloy market, Kepai has established a clear technical evolution path. Our production processes are migrating toward continuous horizontal vacuum casting, precision digital temperature controls, and inline ultrasonic defect scanning:
Deployment of electromagnetic stirring in our casting lines to eliminate lead segregation, ensuring highly uniform lead dispersion even in extra-large hollow bars.
Scaling up our proprietary zero-oxygen extrusion processes to eliminate oxygen pick-up, securing high electrical conductivity and excellent structural integrity in high-conductivity tellurium and sulfur-copper alloys.
Commercialization of bismuth-tellurium-bronze bearing formulations, providing full operational safety and wear resistance while maintaining eco-friendly compliance.
Copper-based alloys play an essential role in medical engineering due to their natural antimicrobial and bio-compatible properties. They are widely utilized in anti-inflammatory components, sterile surfaces, and high-frequency analytical devices.
Electric vehicles demand high-efficiency current transmission and thermal management. Our tellurium and oxygen-free copper series are optimized for charging connector pins, busbars, and internal motor stator segments.
Aerospace components demand high reliability under extreme mechanical stress. Our alloys are manufactured to strict tolerances for high-reliability generators, instrumentation connectors, and auxiliary wear bushings.
Offshore equipment requires materials with superior resistance to seawater corrosion and bio-fouling. Kepai’s customized tin-bronze and copper-nickel alloys provide durable service for maritime components, marine pump shafts, and offshore exploration gear.
Our materials are also integrated into high-precision heavy manufacturing applications, including Plasma Cutting Electrodes, robust Plasma Cutting Electrode Holders, and Photovoltaic Energy Storage connection terminals.
We ensure quality and traceability through every stage of production. From raw melting and casting to drawing, finishing, and packaging, our processes are certified to strict international standards.
Kepai New Material