Commonly referred to as Cartridge Brass or CuZn30, the 70% copper and 30% zinc alloy represents the pinnacle of ductility among all brass alloys. This specific ratio optimizes the "Alpha" phase of the copper-zinc crystal structure, providing an unparalleled balance of strength and cold-working capacity.
With an elongation rate often exceeding 50%, C26000 is the material of choice for deep-drawing processes. It allows for complex shapes without the risk of cracking, reducing the need for intermediate annealing steps compared to higher-zinc alternatives.
The 70/30 ratio offers excellent resonance properties, making it the standard for high-end musical instruments. Thermally, it maintains a conductivity of approximately 120 W/(m·K), balancing heat dissipation with structural integrity.
While all brass possesses inherent corrosion resistance, 70/30 brass is particularly stable in atmospheric and fresh-water environments. Its low zinc content compared to "Muntz Metal" (60/40) significantly reduces the risk of dezincification.
Established in May 2017, Sichuan Kepai New Materials Co., Ltd. is a high-tech pioneer specializing in the R&D, production, and sale of high-conductivity special copper alloys. Our facility bridges the gap between raw metallurgical science and precision industrial application.
Our 70% copper 30% zinc brass begins with high-purity cathode copper. By using VIM technology, we minimize oxygen content and impurities, ensuring the alloy's consistency for high-end electronic connectors.
Control of grain size is critical. Through multi-stage cold rolling and atmosphere-controlled annealing, we achieve a uniform grain structure (typically 0.015mm to 0.045mm), which is essential for deep-drawing cartridge cases and electronic pins.
Kepai is investing in "Green Brass" technologies, focusing on lead-free 70/30 variants that meet future REACH and RoHS environmental standards without sacrificing machinability.
Located in the heart of Sichuan's industrial corridor, Kepai leverages an integrated supply chain. From local copper mining to advanced logistics, we reduce lead times by 30% compared to traditional international suppliers.
Through automation and massive-scale production (29,000 sqm floor space), China-based factories like Kepai offer a superior information gain by providing aerospace-grade materials at a commercial price point.
Beyond the domestic market, our footprint spans North America, Europe, and Southeast Asia. We comply with ASTM (USA), EN (Europe), and JIS (Japan) standards, ensuring seamless integration into global OEM pipelines.
Our commitment to quality is backed by rigorous international auditing. Kepai operates under a comprehensive management system that exceeds standard requirements.
Quality management systems ensuring every batch of brass meets the highest dimensional and chemical tolerances.
Environmental management systems dedicated to reducing our carbon footprint through recycled copper integration.
Occupational health and safety standards that protect our workforce and ensure production continuity.
Get a detailed quote and technical consultation for your 70% Copper 30% Zinc Brass needs today.
SEND INQUIRY NOW
Kepai New Material
