SRG Aluminium



LM25 Overview

MRT manufactures gravity die castings, sand castings and excessive stress die castings in LM25 Aluminium Alloy.

One of the finest blessings of choosing LM25 is the energy that may be accomplished withinside the warmth dealt with situation however warmth remedy can't usually be used on excessive stress die castings, which means that LM25 is maximum normally used for gravity or sand casting.

This alloy conforms to BS 1490:1988 LM25. Castings are standardized withinside the cast (M) situation, the precipitation dealt with (TE) situation, the answer dealt with and stabilized (TB7) situation and the absolutely warmth dealt with (TF) situation.

 % % %
Copper 0.20 max Magnesium 0.20-0.6 Silicon 6.5-7.50
Iron 0.5 Magnesium 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 Others each 0.05 max
Others total 0.15 max


 LM25-TE LM25-TB7
0.2% Proof Stress (N/mm2)80-10080-100120-150130-20080-11090-110200-250220-260
Tensile Strength (N/mm2)130-150160-200150-180190-250160230230-280280-320
Elongation (%)23122.55-2
Impact resistance Izod (Nm)--------
Brinell Hardness55-6555-6570-7575-9565-7565-7590-11090-110
Modulus of Elasticity (x103 N/mm2)7171717171717171
Shear Strength (N/mm2)--140---180250


The tensile residences of LM25 alloy at extended temperatures are inspired via way of means of the condition (warmth treatment) of the castings and the length on the extended temperature.

On brief time period trying out e.g. half-hour at temperature, the residences fall handiest slowly and uniformly as much as approximately two hundred deg C, at which temperature the energy of LM25-TF is decreased via way of means of approximately 20%.

Very extended heating, e.g. 10,000 hours, outcomes in a pointy lack of energy at approximately one hundred thirty five deg c. At two hundred deg C the energy of LM25-TF is much less than 1/2 of of that at room temperature. There is consequently no benefit to be received via way of means of warmth treatment, if the thing is for use at temperatures above approximately a hundred thirty deg C, for prolonged durations of time.


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


The heat-handled alloy has pretty true machining properties, however equipment need to rather be of excessive velocity metal and have to be stored sharp. A reasonably excessive price of device put on can be expected. Liberal reducing lubricant need to be employed. Find out greater approximately MRT’s machining resources.


As with LM6, resistance to corrosive attack by sea water and marine atmospheres is high with this alloy.


A defensive anodic movie may be acquired via way of means of both the sulphuric or chromic acid process, however the gray opaque person of coatings of everyday thickness precludes their colouring in mild sun sunglasses for ornamental purposes. Find out greater approximately the opposite floor finishes provided via way of means of MRT.


There are 3 not unusualplace warmth handled situations for LM25:TE (precipitation handled), TB7 (answer handled and stabilised, and TF (absolutely warmth handled). Read the overall description of our warmth remedy processes.


LM25 is specifically used in which correct mechanical homes are required in castings of form or dimensions requiring an alloy of incredible castability if you want to obtain the favored trendy of soundness.

The alloy is likewise used in which resistance to corrosion is an critical consideration, specially in which excessive electricity is likewise required. It has correct weldability.

Consequently, LM25 reveals software withinside the food, chemical, marine, electric and lots of different industries and, above all, in street shipping automobiles in which it's far used for wheels, cylinder blocks and heads, and different engine and frame castings. Its capability makes use of are multiplied through its availability in 4 situations of warmth remedy in each sand and gravity die castings.

It is, in practice, the overall cause excessive electricity casting alloy, whose variety of makes use of is multiplied through its availability withinside the as-forged and partly heat-dealt with situation as well. It is utilized in nuclear strength installations and for plane pump parts. LM25 can be advanced for castings, specially in gravity dies, which can be tough to make to the specified trendy of soundness. It gives higher machinability and mechanical homes than LM6.

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