IS 4170

IS 4170 is the Indian Standard specification for "Brass Rods for General Engineering Purposes." It covers the chemical composition, mechanical properties, physical properties, fabrication suitability, and typical uses of brass rods used in various engineering applications.

Chemical Composition

• Copper (Cu): 59.00% to 62.00%

• Lead (Pb): Up to 0.75%

• Iron (Fe): Up to 0.10%

• Other impurities: Up to 0.30%

• Zinc (Zn): Balance

Mechanical Properties (As per Temper M)

• Tensile Strength: Minimum 350 MPa (35 Kg/mm²) for rods 1.5 to 75 mm in diameter

• Elongation: Minimum 25%

• Hardness: Typically around 40-70 HRB, depending on size and temper

Physical Properties

• Density: 8.39 g/cm³ (0.303 lb/cu in at 68°F)

• Melting Point: Solidus 1650°F, Liquidus 1660°F

• Electrical Conductivity: 28% IACS at 68°F

• Thermal Conductivity: 71 Btu/sq ft/ft/hr/°F

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

• Modulus of Elasticity: 15,000 ksi

• Modulus of Rigidity: 5600 ksi

• Specific Heat Capacity: 0.09 Btu/lb/°F at 68°F

Fabrication Properties

• Excellent for soldering, brazing, oxyacetylene welding

• Fair for gas shielded arc welding

• Not recommended for coated metal arc welding and seam welding

• Good for spot and butt welding

• Fair capacity for cold working

• Excellent capacity for hot forming

• Forgeability rating: 90

• Machinability rating: 40

Typical Uses

• Architecture and decorative hardware

• Fasteners and industrial components

• General engineering where moderate strength and corrosion resistance are needed

• Suitable for valves, pumps, and automotive parts