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Aluminium Casting Alloy LM25
One of the greatest benefits of selecting LM25 is the strength that can be achieved in the heat treated condition but heat treatment cannot normally be used on high pressure die castings, meaning that LM25 is most commonly used for gravity or sand casting.
This alloy conforms to BS 1490:1988 LM25. Castings are standardised in the cast (M) condition, the precipitation treated (TE) condition, the solution treated and stabilised (TB7) condition and the fully heat treated (TF) condition.
Strength at elevated temperatures
On short term testing e.g. 30 minutes at temperature, the properties fall only slowly and uniformly up to about 200 deg C, at which temperature the strength of LM25-TF is reduced by about 20%.
Very prolonged heating, e.g. 10,000 hours, results in a sharp loss of strength at about 135 deg c. At 200 deg C the strength of LM25-TF is less than half of that at room temperature. There is therefore no advantage to be gained by heat treatment, if the component is to be used at temperatures above about 130 deg C, for extended periods of time.
Machinability of LM25
Applications and General notes
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.
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