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Brass C2680 (Cartridge Brass / H70)

Brass C2680, commonly known as cartridge brass or H70 in Chinese standards, is a 70/30 copper-zinc alloy celebrated for its excellent balance of ductility, strength, and formability. With approximately 70% copper and 30% zinc, it offers superior cold-working characteristics compared to other brass grades, making it the material of choice for deep drawing, stamping, and forming operations. It also delivers reliable corrosion resistance and an attractive golden appearance suitable for both functional and decorative applications.

Mechanical Properties

  • Density: 8.47 g/cm³
  • Tensile Strength: 325 MPa
  • Yield Strength: 120 MPa
  • Elongation at Break: 40%
  • Hardness: HRB 60–85
  • Modulus of Elasticity: 105 GPa
  • Thermal Conductivity: 120 W/m·K
  • Electrical Conductivity: 28 % IACS
  • Melting Point: 900–940 °C
  • Coefficient of Thermal Expansion: 20.0 ×10⁻⁶ /°C

Advantages

✅ Outstanding Cold Formability** — Excellent deep-drawing performance with up to 40% elongation; ideal for stamped shells, cups, and complex formed shapes

✅ Balanced Strength-Ductility Combination** — Offers sufficient structural integrity while maintaining high formability for demanding manufacturing processes

✅ Aesthetic Appeal** — Natural warm golden color that polishes well; widely used for decorative trim, musical instruments, and consumer products

✅ Good Corrosion Resistance** — Resists atmospheric corrosion, dezincification in clean water environments, and tarnish under normal conditions

Machining & Manufacturing

ParameterSpecificationNotes
Cutting SpeedCarbide tooling: 150–300 SFM (45–90 m/min)HSS tools: 80–120 SFM (25–35 m/min)-
Feed Rate0.03–0.15 mm/revUse lower feed rates for finishing to obtain better surface quality
ToolingSharp carbide inserts with 10°–15° positive rake anglesEquip with chip breakers to handle stringy chips
CoolantFull-flood soluble oil coolantFacilitates chip removal and heat dissipation; through-spindle high-pressure coolant optimizes chip control
Difficulty LevelModerateHarder to machine than C3604 free-cutting brass; controllable with proper tools and parameters

Special Notes：

Avoid built-up edge (BUE) by maintaining sharp tools and adequate cutting speeds. Annealed material machines more easily than cold-worked/hard temper grades. Consider stress-relieving before machining if material has undergone severe prior forming

Common Applications

Cartridges & Ammunition Shells: Historically used for bullet casings due to its excellent deep-drawing properties and reliability
Stamped & Drawn Components: Deep-drawn housings, metal containers, bellows, diaphragms, and flexible connectors requiring extreme elongation capability
Radiators & Heat Exchangers: Thin-wall tubes and fin stock leveraging good thermal conductivity combined with formability
Musical Instruments: Saxophones, trumpets, trombones, and other brass instruments where acoustic properties and appearance are critical
Architectural Trim & Decorative Hardware: Door frames, window trims, furniture hardware, and ornamental fittings with polished or brushed finish

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