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LM5

Aluminium Casting Alloy LM5

This aluminium alloy conforms to BS 1490:1988 LM5

Chemical Composition

  %   %   %
 Copper  0.1 max  Magnesium  3.0-6.0   Silicon   0.3 max
 Iron  0.6 max  Manganese  0.3-0.7  Nickel  0.1 max
 Zinc  0.1 max  Lead  0.5 max  Tin  0.05 max
 Titanium  0.2 max  Aluminium  Remainder  Others each  0.5 max
Others total  0.15 max        

 

Mechanical Properties of aluminium casting alloy LM5

 

Sand Casting

Gravity Die Cast

0.2% Proof Stress (N/mm2)

90-110

90-120

Tensile Strength (N/mm2)

140-170

170-280

Elongation (%)

3

5

Impact resistance Izod (Nm)

7.9

12.6

Brinell Hardness

50-70

60-70

Modulus of Elasticity (x103 N/mm2)

71

71

Shear Strength (N/mm2)

140

-

Strength at elevated temperatures

Room temperature properties are largely maintained up to 200°C, but fall rapidly above 300°C.

Physical Properties of aluminium casting alloy LM5

 

 

Coefficient of Thermal Expansion (per °C @ 20-100°C)

0.000023

Thermal conductivity (cal/cm2/cm/°C @ 25°C)

0.33

Electrical conductivity (% copper standard @ 20°C)

31.0

Density (g/cm3)

2.65

Freezing range (°C) approx.

12

Strength at elevated temperatures

Room temperature properties are largely maintained up to 200°C, but fall rapidly above 300°C.

Physical Properties

   
Coefficient of Thermal Expansion (per C @ 20-100C) 0.000023
Thermal counducivity (cal/cm2/cm/C @ 25C) 0.33
Electrical conductivity (% copper standard @ 20C) 31.0
Density (g/cm3) 2.65
Freezing range (C) approx. 642-580

MACHINABILITY

LM5 machines very well and takes an excellent polish.

CORROSION RESISTANCE

LM5 is highly resistant to corrosion under most conditions and is superior to all other aluminium alloys for marine use.

ANODISING

LM5 may be anodised by any of the more common processes. A transparent colourless-to-whitish film is obtained according to the process used, and is suitable for decorative finishing.

APPLICATION AND GENERAL NOTES

LM5 is used where very high resistance to corrosion from sea water or marine atmospheres is required, for equipment used for the manufacture of foodstuffs, cooking utensils and chemical plant, and for an aluminium casting which needs to exhibit and maintain a surface of high polish.

Applications include, for example, door furniture, car fittings and trim, and similar aluminium castings where a colourless anodic film is required.

LM5 is mainly used for sand casting and, to a lesser extent, for gravity die casting, but high pressure aluminium die castings of relatively simple shapes has been made. LM5 is not heat-treated.

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