C2700

C2700 brass is classified as engraving brass in the 60/40 alpha-beta brass family, with a low level of lead (up to 0.05%) to enhance free machining properties. It is commonly used for engraved plates, plaques, builder’s hardware, and gears. However, it is not suitable for acid-etched work, where single-phase alpha brasses are preferred.

Chemical Composition

• Copper (Cu): 63.00 – 67.00%

• Lead (Pb): Up to 0.05%

• Iron (Fe): Up to 0.05%

• Zinc (Zn): Balance

Mechanical Properties (According to JIS C3712, Temper BD)

• Tensile Strength (UTS): Minimum 355 MPa (varies by shape and size)

• Proof Stress: Not specified

• Elongation: Minimum 10% for smaller sizes, 20% for larger diameters and shapes

• Hardness: Not specified

Physical Properties

• Melting Point: Solidus 1660°F, Liquidus 1710°F

• Density: 8.47 g/cm³ (0.306 lb/in³)

• Electrical Conductivity: 27% IACS at 68°F

• Thermal Conductivity: 67 BTU/(ft²·hr·°F)

• Coefficient of Thermal Expansion: 11.3 × 10⁻⁶ per °F

• Specific Heat Capacity: 0.09 BTU/lb/°F

• Modulus of Elasticity: 15,000 ksi

• Modulus of Rigidity: 5600 ksi

Fabrication and Applications

• Excellent soldering and brazing

• Good oxyacetylene welding, fair gas shielded arc welding

• Not recommended for coated metal arc welding and seam welding

• Capacity for cold working is excellent; poor for hot forming

• Machinability rating: 30 (relative scale)