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Zinc Alloys

Overview of Zinc Casting Alloys

Comparison Table of Casting Characteristics of Major Zinc Casting Alloys

 

ZA3

ZA8

ZA12

ZA27

Tensile Strength (N/mm2)

283

220-255

276-310

400-440

Elongation (%)

15

1-2

3-4

3-6

Brinell Hardness

83

85-90

105-125

110-120

Density (g/cm3)

6.7

6.3

6.03

5.0

Freezing range (°C approx.)

387-382

404-375

430-380

490-380

Thermal Con (cal/cm2/cm/°C @ 25°C)

0.27

(115)

0.21

(112.5)

Electrical Con (% copper std. @ 20°C)

26

27.7

25

28

Machinability

E

E

E

E

Corrosion Resistance

E

E

E

E

Electro Plating Suitability

E

G

G

F

Non Spark

Yes

Yes

Yes

No

Casting Characteristics - Sand

G

E

E

E

Casting Characteristics - Gravity

G

E

E

G

Casting Characteristics - High Pressure

E

F

F

F

Material Cost (£/kg - Dec 2011)

£1.84

£1.85

£1.93

£1.97

E = Excellent

G = Good

F = Fair

P = Poor

U = Unsuitable

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