Overview
Soft brass strip refers to annealed copper-zinc alloy supplied in coil or strip form with maximum malleability (temper designation O60). Containing 35-42% zinc, this material combines the corrosion resistance of copper with enhanced formability. Industrial production involves continuous casting, hot rolling to intermediate gauges, followed by cold rolling and final annealing to achieve dead soft condition. The 'full soft' designation indicates complete recrystallization from annealing, yielding elongation values exceeding 40%. This distinguishes it from harder tempers like H58 (half-hard) used for springs. Major standards include ASTM B36 for general purpose brass and EN 1652 for European applications.
Physical and Chemical Properties
The alloy demonstrates a tensile strength range of 200-350 MPa in soft temper, with Vickers hardness between 50-80 HV. Its thermal conductivity reaches 120 W/m·K, approximately 30% that of pure copper. The characteristic golden color darkens with oxidation but maintains better tarnish resistance than pure copper. Chemically, the zinc content provides sacrificial protection against dezincification in marine environments when properly alloyed with 1% tin or arsenic. Electrical resistivity measures 6.5-7.5 μΩ·cm, making it suitable for non-critical conductive applications. The coefficient of thermal expansion is 20.5 × 10⁻⁶/°C (20-300°C range).
Main Applications
In electrical industries, soft brass strip serves as base material for stamped connectors, switch components, and RF shielding due to its balance of conductivity and formability. Decoratively, it's favored for architectural trims, jewelry findings, and musical instrument parts where easy hand-forming is required. Industrial uses include gaskets for plumbing systems, washers, and ammunition components where cold heading performance matters. The material's springback characteristics after bending make it ideal for snap-fit applications in automotive interior trims. Specialized variants with lead additions (CuZn39Pb3) improve machining for complex stamped parts.
Safety and Storage
As a stable alloy, soft brass presents minimal health risks during normal handling. Proper ventilation is recommended when grinding or welding to prevent zinc oxide fume exposure. Storage should avoid contact with ammonia compounds or acidic environments that could cause stress corrosion cracking. Coils are typically wrapped in VCI (volatile corrosion inhibitor) paper and stored on edge to prevent deformation. For long-term storage beyond 12 months, nitrogen-purged packaging is advised in humid climates. Fabricators should degrease oiled surfaces before soldering or brazing operations.
B2B Procurement Guide
Industrial buyers should specify: 1) Temper (must be O60 for full soft), 2) Dimensional tolerances (e.g., ASTM B248 Class B for thickness), 3) Edge condition (slit edge vs. mill edge), and 4) Surface finish (standard mill finish ranges 0.2-0.8μm Ra). For decorative applications, request bright annealed finish with RAL color matching. Minimum order quantities typically start at 500kg for standard alloys, with lead times of 2-4 weeks for custom widths. Quality certifications to request include RoHS compliance reports and material test reports confirming composition and mechanical properties.
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