Poly Metal India
Poly Metal India
Ganesh Peth, Pune, Maharashtra
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Product Details:
Minimum Order Quantity10 Kilogram
Available GradeLm25
Is It AnodisedNot Anodised
Chemical Compositionlm25
Packaging Typeguni
Product Typealu
Melting Point660 deg
Packaging Size2ft x2ft
Purityas per std

LM25 Aluminium Casting Alloy (Al – Si7Mg)

This alloy conforms to British Standard 1490 LM25. Castings are standardised in the following conditions - as cast, LM25-M precipitation treated LM25 - TE; solution treated and stabilized LM25 - TB7; and fully heat - treated LM25 - TF.


Copper 0.1 max.
Magnesium 0.20-0.60
Silicon 6.5-7.5
Iron 0.5 max.
Manganese 0.3 max.
Nickel 0.1 max.
Zinc 0.1 max.
Lead 0.1 max.
Tin 0.05 max.
Titanium* 0.2 max.
Aluminium Remainder.

* 0.05% min. if Titanium alone used for grain refining.

STRENGTH AT ELEVATED TEMPERATURES The tensile properties of LM25 alloy at elevated temperatures are influenced by the condition (heat -treatment) of the castings and the duration at the elevated temperature. For short term testing e.g. 30 minutes at temperature, the properties fall only slowly and uniformly up to about 200oC at which temperature for example, the strength of LM25-TF is reduced by approximately 20%, Very prolonged heating (10,000 hours) results in sharp, loss of strength at about135oC and at 200oC the strength on LM25-TS is less than half of that at room temperature. For prolonged service at elevated temperatures (above 130oC) there is, therefore, no practical advantage to be gained by heat treatment.

Coefficient of Thermal Expansion (per oC at 20 -100 oC) 0.000022
Thermal Conductivity (cal/cm2/cm/oC/s at 25oC * 0.36
Electrical Conductivity (% copper standard at 20oC) * 39
Specific Gravity 2.68
Freezing Range (oC) Approx 615-550
*Applies to fully heat treated sand castings; values are approximate and for castings in other conditions will depend on their thermal history.

MACHINABILITY The heat treated alloy has fairly good machining properties, but tools should preferably be of high speed steel and must be kept sharp. A moderately high rate of tool wear may be expected. Liberal cutting lubricant should be employed. CORROSION RESISTANCE Resistance to corrosive attack by sea water and marine atmospheres is high. ANODISING A protective anodic film can be obtained by either the sulphuric or chromic acid process but the grey opaque character of coatings of normal thickness precludes their colouring in light shades for decorative purposes. CASTING

CHARACTERISTICS FLUIDITY Good, suitable for fairly thin castings. PRESSURE TEST Suitable for castings required to be leak tight. HOT TEARING The production of castings in this alloy very rarely introduces problems due to hot tearing.

TYPICAL POURING TEMPERATURE-710oC The actual temperatures employed may range considerably above or below this value and will depend upon the particular conditions for each castings.

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Poly Metal India
Mr. Pravin Jain  (Proprietor)
278, Ganesh Peth Laxmi Road
Pune - 411002 , Maharashtra , India
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