IS 319 GR II

IS 319 Gr II Free machining brass, resulting from the fusion of copper and zinc, showcases the highest level of machinability among all copper alloys, and serves as the benchmark against which others are measured. IS 319 Gr II Brass is recognized for its strength and corrosion resistance, closely mirroring steel’s attributes, making it one of the most widely embraced copper alloys in contemporary applications. Achieving precision machining with IS 319 Gr II Brass is readily attainable. Despite being ductile in its softened state, IS 319 Gr II Brass remains a robust material, maintaining its strength even when subjected to the most demanding conditions. IS 319 Gr II Brass develops a delicate protective “patina,” setting it apart from steel and iron by preventing rust when exposed to the atmosphere. With its high density, IS 319 Gr II Brass is particularly suited for the creation of heavy-duty industrial components. The highly polished finish of IS 319 Gr II Brass is another highly regarded attribute. This versatile material is offered in a range of shapes, including rounds, flats, squares, hexagons, shapes, and hollows.

CHEMICAL COMPOSITION
Elements Min (%) Max (%)
Cu 60.00 63.00
Pb 2.50 3.00
Fe 0.35
Zn Rem

(1) Cu + Sum of Named Elements 99.5% min.
MECHANICAL PROPERTIES ACCORDING TO IS 319 GR LL (AS PER TEMPER HB)
Range (mm) From To UTS Min (MPa) PS Min Elongation Min (%) Hardness Min (HV) Hardness Max (HV)
Round (Dia) 6 12 395 7 120 150
12 25 385 10 115 145
25 50 345 15 100 130
50 75 315 20 90 120
Hex (A/F) 6 12 395 7 120 150
12 25 385 10 115 145
25 50 345 15 100 130
50 70 315 20 90 120
Square (A/F) 6 12 395 7 120 150
12 25 385 10 115 145
25 50 345 15 100 130
50 60 315 20 90 120
Rectangle (Thickness) 6 12 395 7 120 150
12 25 385 10 115 145
25 50 345 12 100 130
PHYSICAL PROPERTIES
Melting Point – Liquidus°F 1650
Melting Point – Solidus°F 1630
Densitylb/cu in. at 68°F 0.307
Specific Gravity 8.5
Electrical Conductivity% IACS at 68°F 26
Thermal ConductivityBtu/ sq ft/ ft hr/ °F at 68°F 67
Coefficient of Thermal Expansion 68-57210⁻⁶ per °F (68 – 572°F) 11.4
Specific Heat CapacityBtu/ lb /°F at 68°F 0.09
Modulus of Elasticity in Tensionksi 14000
Modulus of Rigidityksi 5300
FABRICATION PROPERTIES
Technique Suitability
Soldering Excellent
Brazing Good
Oxyacetylene Welding Not Recommended
Gas Shielded Arc Welding Not Recommended
Coated Metal Arc Welding Not Recommended
Spot Weld Not Recommended
Seam Weld Not Recommended
Butt Weld Fair
Capacity for Being Cold Worked Fair
Capacity for Being Hot Formed Fair
Machinability Rating 100

IS 319 GR II

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