LM155 datasheet
Aluminium Casting Alloy
(Al-Cu4Sil)

Chemical Composition
  Min Max
Copper 3.8 4.5
Magnesium   0.10
Silicon 1.0 1.5
Iron   0.25
Manganese   0.1
Nickel   0.1
Zinc   0.1
Lead   0.05
Tin   0.05
Titanium 0.05 0.25
Aluminiuim   Remainder
Mechanical Properties
0.2% Proof Stress (N/mm²) 200  
Tensile Stress (N/mm²) 280  
Elongation (%) 4  
Brinell Hardness 85  
Primarily used for aircraft engineering, crankcases rear axels cases and aircraft wheels. Excellent mechanical properties make it particularly suitable for hightly stressed castings where the component requires maximum resistance to shock.