CW508L

CW508L, also known as CZ108 or CuZn37, is a popular high-purity cold-forming yellow brass alloy with approximately 62-64% copper and 37% zinc content.

Chemical Composition

• Copper (Cu): 62.0% – 64.0%

• Zinc (Zn): Balance

• Lead (Pb): Up to 0.10%

• Iron (Fe): Up to 0.10%

• Nickel (Ni): Up to 0.30%

• Tin (Sn): Up to 0.10%

• Aluminium (Al): Up to 0.05%

• Other impurities: Up to 0.20%

Mechanical Properties (temper H070, sheet/plate)

• Proof Stress: 110 – 500 MPa (varies by temper and thickness)

• Tensile Strength: 300 – 550 MPa

• Elongation: Around 3 – 38% (depending on temper)

• Hardness (Vickers): 55 – 180 HV

Physical Properties

• Density: 8.44 g/cm³

• Melting Point: ~916 °C (Liquidus)

• Thermal Conductivity: 116 W/m·K

• Coefficient of Thermal Expansion: 20.5 x 10⁻⁶ /K

• Electrical Conductivity: ~27.6% IACS

Fabrication and Machinability

• Excellent cold working and drawing capabilities, suitable for tubes and sheets

• Fair capacity for hot working

• Excellent soldering and brazing

• Good oxyacetylene welding and spot welding; fair gas shielded arc welding

• Poor seam welding; not recommended for coated metal arc and seam welds

• Machinability rating: Around 35%

• Good corrosion resistance, but not suitable for acetic acid, moist ammonia, hydrochloric acid, or nitric acid environments

Typical Applications

• Heat exchangers and radiator parts

• Decorative sheet and plate components

• Scientific and electrical applications

• Tubing for plumbing, HVAC, and refrigeration industries