IS 319 I

IS 319 Grade I is a free-cutting brass alloy significantly improved from traditional 60/40 brass, widely used for mass production of brass components requiring maximum output and longest tool life. It is suitable for high-speed machining and manufacturing complex parts without the need for further cold forming after machining.

Chemical Composition

• Copper (Cu): 56.00 – 59.00%

• Lead (Pb): 2.00 – 3.50%

• Iron (Fe): Up to 0.35%

• Total Other Elements: Up to 0.70%

• Zinc (Zn): Remainder (Balance)

Mechanical Properties (Typical)

• Tensile Strength (UTS): 325 – 405 MPa depending on size and shape

• Elongation: 4 – 17%

• Hardness: 52 – 155 HV, depending on temper and size

Physical Properties

• Density: 8.47 g/cm³

• Melting Point: Liquidus 1630°F, Solidus 1610°F

• Electrical Conductivity: 28% IACS at 68°F

• Thermal Conductivity: 71 BTU/ft²/hr/°F at 68°F

• Coefficient of Thermal Expansion: 11.6 x 10⁻⁶ /°F (68 – 572°F)

• Modulus of Elasticity: 14,000 ksi

• Modulus of Rigidity: 5300 ksi

Fabrication and Machinability

• Machinability rating: 90 (close to standard free cutting brass)

• Excellent soldering and good brazing characteristics

• Not suitable for most welding

• Cold working capacity: Poor

• Hot working capacity: Excellent

Typical Applications

• Architectural components

• Builders' hardware

• Consumer goods

• Industrial machinery parts

• Ordnance