LM25 Aluminium Alloy
Sand or gravity casting Aluminium alloy.
L M 25 is an aluminium alloy
that conforms to BS 1490 and is
particularly suitable for use in high quality castings where
strength, definition and good corrosion resistance is
important. Alloys with similar chemical composition
are used throughout the world, see below for details.
LM 25 is a high purity aluminium alloy, which can
be gravity diecast in permanent moulds or sand.
It has excellent castability and good mechanical
properties that can be varied by heat treatment.
The alloy is mostly used for high specification
castings in industries where shape and complex
form is required and casting soundness is
important. Its use is widespread in the automotive
industries for alloy wheels, cylinder heads and blocks
and in many other industries such as chemical,
marine and electrical.Castings made from this alloy
can be supplied in the as cast form or in one of three
other heat treated conditions. It should be noted that
there is no significant advantage to be gained from
heat treatment if the service conditions envisaged are
likely to include extended periods at temperatures
above 130 0 C. However, hardness, tensile strength
and elongation can be significantly improved by heat
treatment. Castings in this can be supplied in the
M, TE, TB 7 and
TF conditions.This alloy has excellent resistance to
seawater attack and can be anodised to improve its
corrosion resistance. Anodising will give a grey /
opaque finish suitable for dark decorative finishes
only. LM 25 also has good machining
characteristics and can be welded if required.
This alloy is similar to the following international