IS 319 II

Description

IS 319 Grade II brass forms a thin protective “patina” that prevents rusting, unlike steel and iron. It is a high-density material, making it suitable for heavy industrial parts. The alloy resembles steel in strength and corrosion resistance and is known for easy precision machining. Despite its ductility in softened states, it maintains strength under demanding conditions and is valued for its high polished finish. It is available in rounds, flats, squares, hexagons, shapes, and hollows.

Chemical Composition

• Copper (Cu): 60.00% – 63.00%

• Lead (Pb): 2.50% – 3.70%

• Iron (Fe): Maximum 0.35%

• Total Others: Maximum 0.50%

• Zinc (Zn): Remainder (Balance)

Mechanical Properties (Typical)

• Ultimate Tensile Strength (UTS): 315 – 395 MPa (depending on shape and size)

• Proof Stress (PS): Varies by size

• Elongation: 7% to 20%

• Hardness: 90 – 150 HV, depending on temper

Physical Properties

• Density: 8.5 g/cm³

• Electrical Conductivity: 26% IACS at 68°F (20°C)

• Thermal Conductivity: 67 BTU/ (ft² hr °F) at 68°F

• Coefficient of Thermal Expansion: 11.4 × 10⁻⁶ /°F (68–572°F)

• Modulus of Elasticity: 14,000 ksi

• Modulus of Rigidity: 5,300 ksi

Fabrication Suitability

• Soldering: Excellent

• Brazing: Good

• Welding: Generally not recommended, fair for butt welding

• Cold Workability: Fair

• Hot Forming: Fair

• Machinability: Rated 100 (benchmark for brass)

Typical Applications

• Automotive components

• Builders hardware

• Consumer goods

• Fasteners

• Industrial machinery parts

• Plumbing fittings

IS 319 Grade II free machining brass is widely regarded for its excellent machinability, balanced strength, and corrosion resistance, making it a standard choice in heavy industry and precision engineering.