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C260
Cartridge Brass (70/30) Sheet
C26000
Overview
C260, also known as Cartridge Brass, is one of the most widely used copper-zinc alloys. With 70% copper and 30% zinc, it offers an excellent combination of strength, ductility, and corrosion resistance. Its outstanding cold-working properties make it the go-to alloy for deep drawing, stamping, and forming applications. It is not suitable for hot working but has excellent solderability and brazeability.
Chemical Composition
| Element | Min | Max |
|---|---|---|
| Copper (Cu) | 68.5 | 71.5 |
| Zinc (Zn) | 28.5 | 31.5 |
| Lead (Pb) | 0 | 0.07 |
| Iron (Fe) | 0 | 0.05 |
Alloy Designations
UNSC26000
ASTMB36, B19, B569
SAEJ461, J463
AMS4507
FederalQQ-B-613, QQ-B-626
Mechanical Properties
Tensile Strength44,000 – 76,000 psi
Yield Strength (0.5% ext.)14,000 – 62,000 psi
Elongation in 2"8 – 65%
Rockwell HardnessF55 – B78
Shear Strength32,000 – 50,000 psi
Physical Properties
Density0.308 lb/in³ (8.53 g/cm³)
Melting Point1,680 – 1,750 °F (916 – 954 °C)
Electrical Conductivity28% IACS
Thermal Conductivity70 BTU/ft·hr·°F
Modulus of Elasticity16,000 ksi
Coefficient of Thermal Expansion11.1 × 10⁻⁶ /°F
Typical Applications
- Ammunition components and cartridge cases
- Radiator cores, tanks, and header plates
- Electrical connectors and lamp fixtures
- Hardware, fasteners, and rivets
- Architectural trim and decorative panels
- Musical instrument components
- Plumbing fittings and accessories
- Stamped and formed parts
Fabrication & Joining
- Excellent cold workability — ideal for deep drawing, spinning, and stamping
- Not recommended for hot working
- Readily soldered and brazed
- Suitable for all mechanical joining methods
- Machinability rating: 30% (compared to C360 at 100%)
- Stress-relief anneal recommended after heavy cold work