IS 319 GR III

IS 319 Gr III is a ductile alloy renowned for its excellent machinability and its ability to be easily bent and cold-headed. These attributes make it a fitting choice, particularly for the production of bicycle spoke nipples.

CHEMICAL COMPOSITION
ElementsMin (%)Max (%)
Cu62.0063.00
Pb0.501.50
Fe0.20
Total Others0.50
ZnRemainder
MECHANICAL PROPERTIES ACCORDING TO IS 319 GR III (AS PER TEMPER HB)
Range (mm) From To UTS Min (MPa) PS Min (MPa) Elongation Min (%) Hardness Min Hardness Max
Round (Dia) 6 12 355 8
12 25 345 12
25 50 305 22
50 75 285 27
Hex (A/F) 6 12 355 8
12 25 345 12
25 50 305 22
50 75 285 27
Square (A/F) 6 12 355 8
12 25 345 12
25 50 305 22
50 75 285 27
PHYSICAL PROPERTIES
Density 8.46 g/cm3
Melting Point 910°C
Specific heat cap at 20˚C 0.377 (kj/kgK)
Electrical conductivity 14.7 (MS/m)
Mod of elasticity 105 (GPa)
Coef of therm exp at 20˚C 20.4 (10-6 /K)
Thermal Conductivity 116 W/m.K
FABRICATION PROPERTIES 
Machinability (CuZn39Pb3 = 100 %) 80%
Capacity for being cold worked poor
Capacity for being hot worked Fair
Suitability for soldering Excellent
Suitability for Brazing Good

IS 319 GR III

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