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Commonly designated as C26000 (ASTM) or CuZn30 (EN), this particular composition is known globally as Cartridge Brass. The 70/30 ratio represents the optimum configuration within the alpha-phase brass family, bringing about a highly specific crystal lattice setup (FCC - Face-Centered Cubic). This unique microstructural arrangement provides the alloy with the highest combination of strength and ductility found among all copper-zinc variations.
By keeping the zinc content strictly at 30%, the alloy avoids the formation of the harder, more brittle beta-phase crystals. This makes it an exceptional choice for cold-working processes such as deep drawing, stamping, spinning, and cold heading. It resists strain-hardening during initial formation stages, allowing manufacturers to pull complex shapes without risk of cracking or micro-tearing.
A comparative overview of chemical properties, physical parameters, and mechanical limits of 70% copper 30% zinc brass alloy.
| Property Classification | Technical Metric / Value Range | Engineering Significance |
|---|---|---|
| Copper Content (Cu) | 68.5% - 71.5% | Maintains optimal ductility and native anti-microbial & electrical properties. |
| Zinc Content (Zn) | Balance (approx. 28.5% - 31.5%) | Improves mechanical strength and structural hardness over pure copper. |
| Lead Impurities (Pb) | ≤ 0.07% max | RoHS compliant. Keeps structural integrity and minimizes internal micro-voids. |
| Iron Impurities (Fe) | ≤ 0.05% max | Controls grain size formation during annealing and mechanical processing. |
| Density | 8.53 g/cm³ | Provides critical calculations for strip, sheet, and wire weight distribution. |
| Elastic Modulus | 112 GPa (16,000 ksi) | Key baseline indicator for spring-back prediction in precision stamping operations. |
| Tensile Strength (Annealed) | 300 - 380 MPa | Ensures strong yield performance during critical deep drawing sequences. |
| Elongation (A50 mm) | ≥ 50% | Ensures deep deformability without stress-induced structural fatigue. |
An innovative power in high-end copper alloy manufacturing, combining technical expertise with state-of-the-art production capabilities.
Established in 2017, Sichuan Kepai New Materials Co., Ltd. is a high-tech enterprise integrating research and development, production, and sales. Located in the western area of the Sichuan Guanghan Industrial Development Zone, adjacent to National Highway 108, our facility benefits from a superior geographical location and highly integrated transport routes, laying a strong foundation for rapid global shipping and delivery logistics.
Our operation covers a modern plant area of approximately 9,000 square meters alongside 1,000 square meters of specialized administrative and R&D offices. We prioritize the production of strategic new materials aligned with global high-tech transitions, focusing heavily on special copper alloys—such as tellurium copper, high-conductivity oxygen-free copper, silver copper, dispersion copper, and high-performance brass alloys.
Through our business philosophy of "innovation-driven development, quality wins the market," we deliver premium metals that serve demanding industries globally: new energy vehicles (NEVs), 5G networks, precision laser cutting systems, and high-voltage lithium battery relays.
Every stage of production—from induction melting to micro-structural analysis—is monitored using advanced diagnostic systems.
Procuring raw and semi-finished 70/30 brass materials at scale requires a supply chain partner capable of offering volume stability, rapid scaling, and competitive cost management. Our location in Sichuan's industrial corridor provides us with access to essential raw copper cathodes and pure zinc ingots, insulating our production schedules from local supply shocks.
By leveraging Chinese industrial clusters, we manage the complete manufacturing cycle—from raw element smelting to precision drawing and extrusion—all within a single facility. This vertical integration keeps production costs low, ensuring high quality remains accessible to our global clients.
Furthermore, our proximity to main domestic transport networks and sea-freight hubs allows for smooth, cost-effective container logistics to key ports (Shanghai, Shenzhen, Ningbo) and direct rail routes to Central Europe.
Why next-generation industries are choosing C26000 70/30 brass to replace standard legacy materials.
The rapid expansion of electric vehicles requires reliable electrical contacts, busbars, and complex stamping components. C26000 offers a balanced option—providing solid conductivity (28% IACS) alongside high tensile resilience, ensuring components perform well in automotive environments.
As transmission frequencies increase, connector hardware must support tight, clean shapes. The high ductility of 70% copper 30% zinc allows for the stamping of compact multi-pin connectors and shielding enclosures without micro-structural stress cracking.
Modern battery management systems (BMS) and energy storage relays require durable connecting components. Our brass alloys deliver the structural stability needed for continuous cycles of mechanical expansion and thermal load.
We understand that entering global markets requires strict compliance with international regulations. Our production processes are fully aligned with RoHS (Restriction of Hazardous Substances), REACH, and international standards such as ASTM B36, EN 12165, and JIS H3100.
To support engineering teams globally, we provide detailed metallurgical certificates, mill test reports (MTRs), and full chemical composition analyses with every delivery. Our technical specialists coordinate closely with local teams, offering engineering support for custom tempers (from fully annealed O60 to extra-hard H04) to help optimize your tooling setups and prevent stamping defects.
Our commitment to quality is validated by international regulatory bodies and ISO certifications.
Expert metallurgical answers regarding composition, performance, customization, and delivery.
At 70% Copper and 30% Zinc, the alloy remains entirely in the FCC alpha-phase solid solution. This configuration gives it the highest ductility of any brass alloy, allowing it to withstand high deformation without cracking. Its low work-hardening rate reduces the need for intermediate annealing stages during complex deep-drawing processes.
We use high-purity raw copper cathode and zinc ingots, tracking the composition at each step. In-house chemical tests verify that trace elements like lead (Pb) remain well below the strict 0.07% max limit, ensuring compliance with RoHS and REACH guidelines for electronic components.
We supply a range of customized tempers depending on application needs: Soft Annealed (O60), Quarter Hard (H01), Half Hard (H02), and Full Hard (H04). Our metallurgical team works directly with clients to match the temper with their specific stamping and tooling setups.
Adding zinc to copper increases mechanical strength, but lowers electrical conductivity. Pure copper sits at 100% IACS, while C26000 (70/30 brass) has a conductivity of roughly 28% IACS. This makes it suitable for connectors, terminals, and relay components where a balance of mechanical durability and moderate conductivity is required.
Stress corrosion cracking (SCC) can occur when brass is exposed to internal tensile stresses and corrosive environments (like ammonia). We use controlled thermal stress-relief annealing after forming. For environments prone to corrosion, we also offer custom options with trace additions of elements like arsenic or tin to help prevent dezincification.
Our comprehensive range of high-performance tellurium, sulfur, and chromium-zirconium copper alloys for industrial applications.
Looking ahead, Sichuan Kepai New Materials Co., Ltd. remains committed to research and development in the field of new materials, contributing to the growth of the copper alloy industry globally. We look forward to collaborating with partners from all sectors to build high-performance solutions.
Kepai
