IS 319 GR I

IS319GRI, classified as Free cutting brass, represents a notably enhanced iteration of 60/40 brass, known for its excellent free cutting attributes. It finds application in the high-volume fabrication of brass components demanding maximum output and extended tool longevity. This is particularly applicable in scenarios where no additional cold forming is necessary after the machining process.

CHEMICAL COMPOSITION
ElementsMin (%)Max (%)
Cu56.0059.00
Pb2.003.50
Fe0.35
Total Others0.70
ZnRemainder
MECHANICAL PROPERTIES ACCORDING TO 319 GR I (AS PER TEMPER HB)
Range (mm) From To UTS Min (MPa) PS Min Elongation Min (%) Hardness Min (HV) Hardness Max (HV)
Round (Dia) 6 12 405 4 125 155
12 25 395 6 120 150
25 50 355 12 110 140
50 75 325 17 100 130
Hex (A/F) 6 12 405 4 125 155
12 25 395 6 120 150
25 50 355 12 110 140
50 70 325 17 100 130
Square (A/F) 6 12 405 4 125 155
12 25 395 6 120 150
25 50 355 12 110 140
50 60 325 17 100 130
Rectangle (Thickness) 6 12 405 4 125 155
12 25 395 6 120 150
25 50 355 12 110 140
PHYSICAL PROPERTIES
Melting Point – Liquidus°F 1630
Melting Point – Solidus°F 1610
Densitylb/cu in. at 68°F 0.306
Specific Gravity 8.47
Electrical Conductivity% IACS at 68°F 28
Thermal ConductivityBtu/ sq ft/ ft hr/ °F at 68°F 71
Coefficient of Thermal Expansion 68-57210⁻⁶ per °F (68 – 572°F) 11.6
Specific Heat CapacityBtu/ lb /°F at 68°F 0.09
Modulus of Elasticity in Tensionksi 14000
Modulus of Rigidityksi 5300
FABRICATION PROPERTIES
Technique Suitability
Brazing Good
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 Poor
Capacity for Being Hot Formed Excellent
Machinability Rating 90

IS 319 GR I

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