IS2704

IS 2704 is a standard for leaded brass wires primarily used for cold-headed and machined parts. It is known for excellent machinability and good hot stamping suitability, especially when forged parts are extensively machined afterwards. These brass alloys are suited for applications involving minimal cold working, such as knurling, due to their high ductility.

Chemical Composition

• Copper (Cu): 62.00 – 65.00%

• Lead (Pb): 0.75 – 1.50%

• Iron (Fe): Up to 0.10%

• Total others: Up to 0.50%

Mechanical Properties

• Tensile Strength (UTS): 345 – 410 MPa (varies with diameter and form)

• Elongation: Approximately 30% minimum

• Hardness: 110 – 130 HV

• Impact: High

Physical and Fabrication Properties

• Specific Gravity: 8.47

• Electrical Conductivity: 26% 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: 5,600 ksi

• Excellent soldering and good brazing

• Not recommended for oxyacetylene or gas shielded arc welding

• Limited suitability for butt welding

• Good cold workability, poor hot workability

• Machinability rating is approximately 70%

Applications

• Valves, pumps, automotive parts, general engineering components, cold-headed, and machined parts