Gun Metal     Gun Metal 
 
British Standard : G1  
Indian Standard : Grade I 
Nominal Composition : 88 / 10 / 2 
Tensile Strength (kg/mm2) : 26 - 64 
Elongation % on 2" : 15 - 25 
Brinell Hardness : 70 - 95 
Typical Uses : Pressure tight bearings, bushes, pumps and pump fittings, valves, valve bodies, and valve guides under corrosive marine conditions. 

British Standard : G2  
Indian Standard : Grade II 
Nominal Composition : 88 / 8 / 4 
Tensile Strength (kg/mm2) : 25 - 32 
Elongation % on 2" : 15 - 25 
Brinell Hardness : 70 - 90 
Typical Uses : Pressure tight bearings, bushes, pumps and pump fittings, valves, valve bodies, and valve guides under corrosive marine conditions. 

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 

British Standard : LG1  
Indian Standard : 
Nominal Composition : 83 / 3 / 9 / 5 
Tensile Strength (kg/mm2) : 17 - 22 
Elongation % on 2" : 12 - 15 
Brinell Hardness : 55 - 65 
Typical Uses : Hardware fittings, plumbing fixtures 

British Standard : LG2  
Indian Standard : LTB 2 / Grade II 
Nominal Composition : 85 / 5 / 5 / 5 
Tensile Strength (kg/mm2) : 19 - 26 
Elongation % on 2" : 15 - 25 
Brinell Hardness : 65 - 75 
Typical Uses : Valve bodies, pump bodies, elbows, pipes, taps, cocks and other hydraulic fittings where pressure tight fittings are important 

British Standard : LG3  
Indian Standard : Grade I 
Nominal Composition : 86 / 7 / 5 / 2 
Tensile Strength (kg/mm2) : 22 - 31 
Elongation % on 2" : 12 - 25 
Brinell Hardness : 70 - 85 
Typical Uses : Pump and valve parts, steam valves, oil pumps, bushes of medium strength 

British Standard : LG4  
Indian Standard : LTB 1 
Nominal Composition : 88 / 7 / 2 / 3 
Tensile Strength (kg/mm2) : 25 - 32 
Elongation % on 2" : 18 - 25 
Brinell Hardness : 70 - 85 
Typical Uses : Railway bearings, engine components, tractor parts and pressure components 
 

Name
Gun Metal
BS
G1
G3
LG1
LG2
LG4
Element
Min
Max
Min
Max
Min
Max
Min
Max
Min
Max
 
%
%
%
%
%
%
%
%
%
%
Copper Rem - Rem -
Rem
- Rem - Rem. -
Tin 9.70 10.50 6.50 7.50 2.00 3.50 4.00 6.00 6.00 8.00
Zinc 1.75 2.75 1.75 3.00 7.50 9.50 4.00 6.00 1.70 3.20
Lead - 1.50 0.10 0.50 4.00 6.00 4.00 6.00 2.70 3.50
Phosphorous - 0.02 - 0.02 - - - 0.02 - 0.02
Nickel - 1.00 5.25 5.75 - 2.00 - 2.00 - 2.00
Iron - 0.15 - - - - - 0.25 - 0.20
Aluminium - 0.01 - 0.01 - 0.01 - 0.01 - 0.01
Maganese - - - 0.02 - - - - -  
Antimony - - - - - - - - - 0.25
Iron+Arsenic - - - - - - - - - 0.15
Antimony - - - - - 0.75 - 0.50 - 0.04
Silicon - 0.02 - 0.01 - 0.02 - 0.02 - 0.01
Bismuth - 0.03 - 0.02 - 0.10 - 0.05 - 0.05
Maganesium - - - - - - - - - -
Sulphur Nicbium - 0.10 - 0.10 - 0.10 - 0.10 - 0.10
Impurities - 0.50 - 0.50 - 1.00 - 0.80 - 0.70
 
 
 
 
 
Manufacturer and exporter of Copper Alloy Ingots
 
 
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