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Aluminium Alloys

Comparison Table of Casting Characteristics of Major Aluminium Casting Alloys

 

LM5

LM6

LM9

LM16

LM24

LM25

LM27

LM31

Tensile Strength (N/mm2)

140-170

160-190

95-120

170

180

130-150

140

215

Elongation (%)

3

5

03/05/03

2

1.5

2

1

4

Brinell Hardness

50-70

50-55

75-85

85

85

55-65

70-85

70

Density (g/cm3)

2.65

2.65

2.68

2.7

2.79

2.68

2.75

2.81

Freezing range (degC approx.)

642-580

575-565

575-550

620-550

580-520

615-550

605-525

615-570

Thermal Con (cal/cm2/cm/deg C @ 25degC)

0.33

0.34

0.35

0.34

0.23

0.36

0.37

0.35

Electrical Con (% copper std. @ 20degC)

31

37

38

39

24

39

27

35

Machinability

E

P

F

G

G

G

G

G

Corrosion Resistance

E

E

G

G

F

E

G

E

Electro Plating Suitability

F (2)

F (1)

F (1)

F (1)

F

F

G

F

Non Spark

No

No

No

No

No

No

No

No

Casting Characteristics - Sand Casting 

F

E

G

G

F*

E

G

G

Casting Characteristics - Gravity Die Casting

F

E

G

G

F

E

E

F

Casting Characteristics - High Pressure Die Casting

F

G

*

*

E

G

G

F

Material Cost (£/kg - Dec 2011)

£2.20

£1.95

£1.94

£1.94

£1.76

£1.92

£1.79

£2.20

E = Excellent
G = Good
F = Fair
P = Poor
U = Unsuitable
* = Not normally used in this form
1 = These alloys, containing Silicon, require a modification treatment for good adhesion
2 = Can be plated, but not recommended

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