The Brock Metal Company > Products > Aluminium > Pressure Diecasting Aluminium alloy > LM 24
LM24 Aluminium Alloy
Pressure diecasting Aluminium alloy.
L M 24 is essentially a pressure diecasting alloy which conforms to BS 1490 1988 and is the most widely used of the secondary aluminium casting alloys manufactured by Brock Metal.
Application
LM 24 is a general-purpose alloy suitable for high volume precision diecastings. This alloy offers excellent casting characteristics and good mechanical properties that make it ideal for engineering and functional parts, being ideally suited for the manufacture of thin wall sectioned castings. LM 24 offers excellent pressure retention properties and similar machining characteristics to other pressure diecasting alloys. . But should not be specified where high resistance to corrosion is a critical requirement. The surfaces of LM 24 castings are not generally suitable for decorative anodising but other decorative finishes can be achieved easily.
It should be noted that pressure castings are not normally suitable for heat treatment. LM 24 retains its ambient temperature tensile strength up approximately 150 0 C but a 50% loss in these figures should be anticipated at around 250 0 C.
The composition of this alloy is typical of that used throughout Europe and the United States of America.
| France |
Germany |
Italy |
USA |
Japan |
Australia |
| A-S9U3A-Y4 |
G-AlSi8Cu3 |
UNI5075 / 3601 |
A380 |
AC4B / ADC10 |
CA3134 / BA323 / AA325 |
|
Alloy Designation
|
Al Si 8Cu 3.5
|
Colour code
|
Red + blue.
|
|
Short designation
|
LM 24
|
Alloy Number.
|
N/A
|
| Chemical composition of Ingots. BS 1490 1988 |
|
Cu |
Si |
Mg |
Fe |
Mn |
Ni |
Zn |
Pb |
Sn |
Ti |
Others |
Total |
| Minimum |
3.0 |
7.5 |
|
|
|
|
|
|
|
|
Each |
|
| Maximum |
4.0 |
9.5 |
0.30 |
1.3 |
0.5 |
0.5 |
3.0 |
0.3 |
0.2 |
0.2 |
0.05 |
0.15 |
| MECHANICAL PROPERTIES |
|
Supplied in diecast form.
|
Minimum
|
Maximum
|
| Tensile strength |
180 MPa |
320 MPa |
| 0.2% Proof Stress |
100MPa |
150 MPa |
| Impact strength Charpy |
-- |
3.4Nm |
| Elongation |
1.5 % |
1-3% |
| Shear strength |
-- |
195MPa |
| Modulus of Elasticity x103 |
71 MPa |
71 MPa |
| Fatigue Strength 5 x 108 cycles |
70 MPa |
138 MPa |
| Hardness BHN |
85 max |
85 max |
| PHYSICAL PROPERTIES |
| Melting range |
580 - 520° C |
| Density |
2.79g / cm3 |
| Coefficient of Thermal expansion |
0.000021 |
| Thermal Conductivity |
0.23 |
| Electrical Conductivity |
24 % IACS |
| Electrical Resistivity |
-- |
