Did we Mention the Quality?

Our air jack stands are cast from superior grade LM25, fully heat-treated (TF) aluminium.

Mechanical Properties

 Property

Sand

Gravity

0.2% Proof Stress (N/mm2)

200-250

220-260

Tensile Strength (N/mm2)

230-280

280-320

Elongation (%)

-

2

Impact resistance Izod (Nm)

-

-

Brinell Hardness

90-110

90-110

Modulus of Elasticity (x103 N/mm2)

71

71

Shear Strength (N/mm2)

180

250

Physical Properties

Property

Value

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

0.000022

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

0.36

Electrical conductivity (% copper standard @ 20°C)

39

Density (g/cm3)

2.68

Freezing range (°C) approx.

615-550

Corrosion Resistance
Resistance to corrosive attack by sea water and marine atmospheres is high with this alloy.

Heat Treatment
There are three common heat treated conditions for LM25:TE (precipitation treated), TB7 (solution treated and stabilised, and TF (fully heat treated).  Our air jack stands are TF.

Applications and General notes
LM25 is mainly used where good mechanical properties are required in castings of shape or dimensions requiring an alloy of excellent castability in order to achieve the desired standard of soundness. The alloy is also used where resistance to corrosion is an important consideration, particularly where high strength is also required. It has good weldability.  Consequently, LM25 finds application in the food, chemical, marine, electrical and many other industries and, above all, in road transport vehicles where it is used for wheels, cylinder blocks and heads, and other engine and body castings. Its potential uses are increased by its availability in four conditions of heat treatment in both sand and gravity die castings. It is, in practice, the general purpose high strength casting alloy, whose range of uses is increased by its availability in the as-cast and partially heat-treated condition as well.  It is used in nuclear energy installations and for aircraft pump parts.  LM25 may be superior for castings, particularly in gravity dies, which are difficult to make to the required standard of soundness. It offers better machinability and mechanical properties than LM6.