Core Difference: Zinc Content & Alloy Type
| Feature | JIS C2600 | JIS C2680 |
|---|---|---|
| Common Name | 70/30 Brass, Cartridge Brass | 65/35 Brass, Yellow Brass (High Brass) |
| Nominal Composition | Cu 70%, Zn 30% | Cu 65%, Zn 35% |
| Alloy Phase | Single-phase (α brass) | Dual-phase (α + β brass) |
Detailed Comparison of Properties & Characteristics
| Property | JIS C2600 | JIS C2680 |
|---|---|---|
| Formability (Cold Work) | Excellent. The benchmark for deep drawing, stamping, and bending due to its single-phase α structure. | Good, but inferior to C2600. Higher zinc content introduces a harder β phase, reducing ductility and limiting severe cold forming. |
| Strength | Good, can be increased by cold working. | Higher strength and hardness in the as-supplied condition due to the β phase. |
| Machinability | Fair. | Better than C2600. The β phase helps in chip breaking, though not as good as leaded brasses (e.g., C3600). |
| Corrosion Resistance | Good general resistance. More resistant to dezincification than higher-zinc brasses. | Slightly lower. Higher zinc content generally makes it more susceptible to dezincification in certain environments. |
| Color | Rich, warm golden yellow. | Lighter, more yellowish color (hence "Yellow Brass"). |
| Hot Workability | Good. | Better than C2600. The β phase is more amenable to hot working processes like extrusion or forging. |
| Cost | Slightly higher due to higher copper content. | Generally more economical due to lower copper (65%) and higher zinc content. |
Application Comparison
| JIS C2600 (70/30 Brass) | JIS C2680 (65/35 Brass) |
|---|---|
| • Deep-drawn components: Electrical sockets, cartridge cases, intricate stampings. • Heat exchanger tubes and fins. • Decorative architectural trim (where premium formability and color are valued). • Springs, contacts, and connectors requiring good cold work and conductivity. |
• General-purpose stampings and formed parts where extreme deep drawing is not required (e.g., hinges, brackets, lamp bases). • Plumbing fittings, valves, and hardware. • Fasteners and screws. • Architectural grilles and lower-cost decorative items. • Hot-forged or extruded components. |
Key Takeaway & Selection Guide
Choose JIS C2600 when: You need maximum cold formability (deep drawing, complex bending), better corrosion resistance, and a richer golden color. It is the premium choice for intricate stamped parts.
Choose JIS C2680 when: You need higher strength and hardness at a lower cost, and your forming requirements are less severe. It is an excellent general-purpose brass for a wide range of applications where extreme ductility is not critical.
Our factory
Our factory specializes in the production and manufacturing of high-quality copper products. We operate a comprehensive, end-to-end production line equipped with advanced continuous casting and rolling mills, precision drawing machines, high-speed rolling mills, and automated heat treatment systems. We professionally produce a wide range of copper tubes, plates, bars, wires, and foils. A strict quality inspection system is implemented throughout the entire process, from raw material intake to finished product delivery. Supported by precision instruments such as spectrometers, metallographic microscopes, tensile testing machines, eddy current flaw detectors, and laser dimension gauges, we ensure that our products fully comply with international and domestic standards-including ASTM, EN, JIS, and GB-in terms of chemical composition, mechanical properties, dimensional accuracy, and surface quality. We are committed to providing global customers with stable, reliable, and fully-specified copper material solutions.
copper product packaging
Our products are packaged using professional, customized industrial packaging solutions to ensure they remain intact during long-distance transportation and multiple handlings. For long products such as copper tubes and bars, we use sturdy waterproof wooden crates or metal-frame boxes for secure fixing and protection. Copper plates and foils are individually wrapped with anti-rust paper, then packed into steel-edged boxes or on pallets with reinforced hard corners. Copper wires are wound with moisture-proof film and neatly coiled onto custom-designed reels or placed in wooden cases. All packaging is clearly marked according to customer requirements with shipping marks, specifications, batch numbers, and handling symbols. Desiccants can also be placed inside the packages when needed, providing complete protection against rust, moisture, and impact throughout the entire journey from production to the destination port.
