British Standard G3
Indian Standard
Nominal Composition 85/7/2.5/5.5
Tensile Strength (kg/mm2) 28-34
Elongation % on 2" 18-25
Brinell Hardness 70-90
Typical Uses

Cast components such as actuating nuts, valve, pump and similar components at normal temperatures under corrosive conditions.

Name Gun Metal
BS G3
Element Min Max
  % %
Copper Rem -
Tin 6.50 7.50
Zinc 1.75 3.00
Lead 0.10 0.50
Phosphorous - 0.02
Nickel 5.25 5.75
Iron - -
Aluminium - 0.01
Manganese - 0.02
Antimony - -
Iron + Arsenic - -
Impurities - 0.50