LM- 4 alloy has fair castibility but generally inferior to LM- 6 and ADC – 12 alloys. Good electrical conductivity accounts for wide usage in electrical engineering industries. In general LM- 4 aluminium alloys are less susceptible to change in temperature than are other base alloys. LM- 4 alloys are leveled to relatively small and heavy sectioned castings. This alloy must be produced from high purity virgin aluminium for the best casting results.


Alloying Elements(%)            
Si 4.00 – 6.00
Cu 2.00 – 4.00
Mn 0.20 – 0.60
Impurities Fe 0.8 M
Mg 0.15 M
Ni 0.30 M
Zn 0.50 M
Sn 0.10 M
Ti 0.20 M
Pb 0.10 M