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LM16

Aluminium Casting Alloy LM16

This alloy conforms to BS 1490:1988 LM16. Castings are standardised in the solution treated and naturally aged (TB) condition and in the fully heat treated (TF) condition.

Chemical Composition

  %   %   %
 Magnesium  0.4-0.6  Copper  1.0-1.5  Iron  0.6 max
 Silicon  4.5-5.5  Nickel  0.25 max  Manganese  0.5 max
           
 Lead  0.1 max  Zinc  0.1 max  Titanium  0.2 max
 Tin  0.05    Other each  0.05 max  
 Others total  0.15 max    Aluminium  Remainder  

 

Mechanical Properties

 

TB Sand Cast

TB Gravity Die Cast

TF Sand Cast

TF Gravity Die Cast

0.2% Proof Stress (N/mm2)

120-140

140-150

220-280

250-300

Tensile Strength (N/mm2)

170

230

230-290

280-320

Elongation (%)

2

3

0-1

0-2

Impact resistance Izod (Nm)

1.4

2.7

1.0

1.4

Brinell Hardness

80

85

100

110

Modulus of Elasticity (x103 N/mm2)

71

71

71

71

Shear Strength (N/mm2)

-

-

200

235

Strength at Elevated Temperatures

LM16 retains its strength well, up to 200°C

Physical Properties

 

 

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

0.000023

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

0.34

Electrical conductivity (% copper standard @ 20°C)

39

Density (g/cm3)

2.70

Freezing range (°C) approx.

620-550

Machinability

The heat-treated alloy has fairly good machining properties, but tools, which should preferably be of high speed steel, must be kept sharp. A moderately high rate of tool wear may be expected. Liberal cutting lubricant should be employed.

Corrosion resistance

The alloy has fairly good resistance to corrosion under atmospheric conditions.

Anodising

A protective film, usually greyish in colour, may be obtained by either the sulphuric or chromic acid process.

Heat Treatment

Full heat treatment gives high strength and hardness

Applications and General Notes

LM16 alloy is used for water-cooled cylinder heads, valve bodies, water jackets, cylinder blocks, fire hose couplings, air compressor pistons, fuel pump bodies, aircraft supercharger covers and similar applications where leak-proof castings having the high strength produced by heat treatment are required.

It is equally suitable for sand casting and for gravity die casting. LM16 has good weldability.

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