Overview
Brass blocks are pre-formed rectangular or cylindrical pieces of brass alloy, primarily composed of copper (60-90%) and zinc (10-40%). They serve as raw material for machining custom components across industries. The alloy's gold-like appearance also makes it popular for decorative applications. Brass blocks are categorized by their zinc content (e.g., low-zinc "cartridge brass" or high-zinc "architectural brass"). Their workability surpasses many metals, allowing precise milling, drilling, and threading with standard tools. This makes them a cost-effective choice for prototyping and mass production.
Physical and Chemical Properties
Brass blocks exhibit a distinctive gold color that darkens with oxidation. Their density is lower than pure copper, reducing material costs while maintaining good strength. Thermal conductivity ranges between 100-125 W/m·K, suitable for heat-exchanger components. The alloy's corrosion resistance stems from copper's patina-forming tendency, which protects against water and atmospheric degradation. However, dezincification (selective zinc leaching) can occur in acidic or saline environments, requiring specialized alloys (e.g., arsenic-added brass) for marine applications.
Main Applications
In industrial settings, brass blocks are machined into bearings, gears, and valve components due to their self-lubricating properties and wear resistance. The electronics industry uses them for conductive terminals and RF shielding. Architects and designers utilize brass blocks for door handles, plaques, and artistic sculptures. Their antimicrobial properties (from copper content) make them suitable for healthcare fixtures. Musical instrument manufacturers value brass for acoustic properties in wind instruments and cymbals.
Safety and Storage
Solid brass blocks pose minimal health risks but require precautions during machining. Dust containing zinc oxide can cause metal fume fever if inhaled—use local exhaust ventilation and PPE during grinding or welding. Store blocks away from acids, ammonia, and moisture to prevent tarnishing. Stacking should be avoided to prevent surface scratches. For long-term storage, consider anti-tarnish paper or vapor corrosion inhibitors (VCIs).
B2B Procurement Guide
Key specifications when ordering include alloy grade (e.g., C36000 for free-machining brass), dimensional tolerances (±0.1mm standard), and surface finish (mill finish or polished). Leaded brass (2-3% Pb) improves machinability but may require RoHS compliance documentation. Suppliers typically offer blocks in standard sizes (e.g., 100x100x50mm) or custom-cut dimensions. MOQs vary from 10kg for specialty alloys to tonnage quantities for common grades. Request material certificates (e.g., EN 12165 CW614N) for critical applications.
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