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zinc alloy ingot
·introduction
·applications
·gz2 zinc alloys
·gz3 zinc alloys
·gz4 zinc alloys
·gz5 zinc alloys
·gz8 zinc alloys
·alloy selection guide
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  introduction  
applications

applications list of zinc alloy

alloy used

most common

less common

toys

3

5

bathroom hardware

3

4 , 5

tableware,silverware

3

 

zlippers

5

3 , 4

fashion accessories(buckles,buttons)

3

 

gas regulators

3 , 5

 

ceiling fans

3

4

domestic hardware(locks,drawer pulls, fittings)

3

5

electronics,electrical

3

4 , 5

domestic appliances

5

3

industrial hardware

5

2 , 8, 12

sporting equipment(golf clubs,fishing reels)

5

2 , 8, 12

automotive parts(locks,wipers,brackets,seat,parts,carburettors)

8

2 , 3, 12

   
charateristics

general grades

gz2

gz3

gz4

gz5

gz8

gz12

mechanical properties

die casti

die casti

die casti

die casti

sand cast

die casti

sand cast

die casti

ultimate tensile strength

359

283

317

331

263

372

276-317

400

impact of stress

47

58

61

65

20

42

19

28

extension coefficient

7

10

7

7

1-2

6-10

1-3

4-7

brinell hardness

100

82

92

91

85

95-110

90-105

95-115

shear strength

317

214

214-262

262

——

275

255

296

yield strength

283

221

221-269

269

200

290

207

317

anti-fatigue strength

59

48

48-57

57

——

103

103

——

pressure on the yield strength

641

414

414-600

600

199

252

227

269

 
physical charateristics

general grades

gz2

gz3

gz4

gz5

gz8

gz12

density

6.6

6.6

6.6

6.6

6.3

6.0

melting point

379-390

381-387

380-386

380-386

375-404

377-432

conductivity

25

27

26-27

26

27.7

28.3

thermal conductivity

104.7

113.0

108.9-113.0

108.9

114.7

116.1

coefficient of thermal expansion

27.8

27.4

27.4

27.4

23.3

24.2

specific heat

418.7

418.7

418.7

418.7

435.4

448.0

mold shrinkage rate

0.007

0.007

0.007

0.007

0.007

0.0075

   
  gz2 zinc alloys  

alloy 2 offers the highest strength and hardness of the low aluminum zinc alloys. however, its high copper content (3%) results in property changes upon long-term aging. these changes include slight dimensional growth ( 0.0014 mm/mm after 20 yrs.), lower elongation and reduced impact strength. the creep properties of alloy 2 are better than alloy 3 and 5 and it also maintains higher strength and hardness after long-term aging. alloy 2 also has good wear properties, and may eliminate bushings and wear inserts in die cast designs. alloy 2 can be used at gravity cast, for example, it is used to make metal forming dies or plastic injection tools.

gz2 typical composition

 

%

 

%

aluminum

4.1

rail

0.002

magnesium

0.045

nickel

< 0.001

copper

2.8

si

0.005

lead

0.002

indium

< 0.005

cd

0.001

thallium

< 0.001

tin

< 0.001

zinc

margin

 

gz2 component specifications

element

minimum( %)

highest( %)

element

minimum( %)

highest( %)

al

3.9

4.2

iron

 

0.020

mg

0.035

0.05

nickel

 

0.001

cu

2.7

2.9

silicon

 

0.02

pb

 

0.003

zinc

 

0.0005

cd

 

0.003

indium

 

0.001

sn

 

0.001

thallium

 

margin

 

gz2 in line with international standards

usa astm b240-88 z33521

europe en 1774-1998 zna14(zl0400,zl3)

 

alloy form factor

grade article alloy each bar
general weight gz2 1120kg
general size 10kg 960x436x540
alloy number 480x109x36 112
   
gz3 zinc alloys

alloy 3 is usually the first choice when considering zinc for pressure die-casting. its excellent balance of desirable physical and mechanical properties, superb castability and long-term dimensional stability are the reasons why over 70% of all zinc die-castings are made from alloy 3. alloy 3 also offers excellent finishing characteristics for electroplating, painting and chromate treatments.

gz3 typical ingredients

 

%

 

%

aluminum

4.1

iron

0.002

magnesium

0.045

nickel

< 0.001

copper

0.001

silicon

0.005

lead

0.002

zinc

< 0.0005

cadmium

0.001

indium

< 0.001

tin

< 0.001

thallium

margin

gz3 component specifications

element

minimum( %)

highest( %)

element

minimum( %)

highest( %)

al

3.9

4.2

iron

 

0.020

mg

0.04

0.05

nickel

 

0.001

cu

 

0.03

silicon

 

0.02

pb

 

0.003

zinc

 

0.0005

cd

 

0.002

indium

 

0.001

sn

 

0.001

thallium

 

margin

gz3in line with international standards

az1881-1986 zna14

jis h2201-1999 zinc ailoy type 2

astm b240-88 z33521

en 1774-1998 zna14(zl0400,zl3)

gb8738-88-zznaid4a

 

physical specifica
  slab bundle
grade stamp gz2  
mass(nominal) 10kg 1120kg
dimensions in mm(nominal) 480x109x36 960x436x540
pack size   112
   
gz4 zinc alloys

alloy 4 was developed in asia. it has a copper level midway between alloy 3 & 5. it has been found to reduce the effects of die soldering that occurs in some castings when made from alloy 3, but still retains ductility similar to alloy 3.

gz4typical ingredients

 

%

 

%

al

4.1

iron

0.002

mg

0.045

nickel

< 0.001

cu

0.4

silicon

0.005

pb

0.002

zinc

< 0.0005

cd

0.001

indium

< 0.001

sn

< 0.001

thallium

margin

gz4component specifications

element

minimum(%)

highest(%)

element

minimum(%)

highest( %)

al

3.9

4.2

iron

 

0.020

mg

0.04

0.05

nickel

 

0.001

cu

0.3

0.4

silicon

 

0.02

pb

 

0.003

zinc

 

0.0005

cd

 

0.002

indium

 

0.001

sn

 

0.001

thallium

 

margin

 

physical specifications

  slab bundle
grade stamp gz4  
mass(nominal) 10kg 1120kg
dimensions in mm(nominal) 480x109x36 960x436x540
pack size   112
   
gz5 zinc alloys

alloy 5 pressure die-castings are stronger and harder than alloy 3,but with a little reduction in ductility which can affect formability during secondary bending, riveting, swaging or crimping operations.these property changes are due to the addition of 1% copper. alloy 5 exhibits excellent castability, as well as improved creep performance over alloy 3. it is readily electroplated, finished and machined,comparable to alloy 3.

gz5typical ingredients

 

%

 

%

al

4.1

iron

0.002

mg

0.045

nickel

< 0.001

cu

0.85

silicon

0.005

pb

0.002

zinc

< 0.0005

cd

0.001

indium

< 0.001

sn

< 0.001

thallium

margin

gz5component specifications

element

minimum( %)

highest( %)

element

minimum( %)

highest( %)

al

3.9

4.2

iron

 

0.020

mg

0.04

0.05

nickel

 

0.001

cu

0.75

1.1

silicon

 

0.02

pb

 

0.003

zinc

 

0.0005

cd

 

0.002

indium

 

0.001

sn

 

0.001

thallium

 

margin

gz5in line with international standards

az1881-1986 zna14 cu1

jis h2201-1999 zinc ailoy type 1

astm b240-88 z33530

en 1774-1998 zna14cu1(zl0410,zl5)

gb8738-88-zzna1d4-1a

 

 

form factor alloy

  slab bundle
grade stamp gz5  
mass(nominal) 10kg 1120kg
dimensions in mm(nominal) 480x109x36 960x436x540
pack size   112
   
gz8 zinc alloys

although developed as a gravity casting grade, most alloy 8 is used on hot chamber pressure die-casting. it has higher strength, hardness and creep properties than alloy 3 & 5. alloy 8 is readily electroplated and finished using the same procedures as alloy 5. when the performance of alloy 3 or 5 are in question, alloy 8 is often the ideal die casting alloy because of high strength and creep properties, and hot chamber castability.

gz8typical ingredients

 

%

 

%

al

8.5

iron

0.002

mg

0.025

nickel

< 0.001

cu

1.1

silicon

0.005

pb

0.002

zinc

< 0.0005

cd

0.001

indium

< 0.001

sn

< 0.001

thallium

margin

gz8component specifications

element

minimum( %)

highest( %)

element

minimum( %)

highest( %)

al

8.2

8.8

iron

 

0.035

mg

0.020

0.030

nickel

 

0.001

cu

0.8

1.3

silicon

 

0.035

pb

 

0.005

zinc

 

0.0005

cd

 

0.005

indium

 

0.001

sn

 

0.002

thallium

 

margin

gz8in line with international standards

astm b669 za-8

 

physical specifications

  slab bundle
grade stamp gz8  
mass(nominal) 10kg 1120kg
dimensions in mm(nominal) 480x109x36 960x436x540
pack size   112
   
alloy selection guide

general grades

gz2

gz3

gz4

gz5

gz8

gz12

die-casting performance

u (e)

u (e)

(g)

(g)

(vg)

(vg)

sand casting performance

(g)

(nr)

(vg)

(vg)

(g)

u (e)

intensity

(vg)

(g)

u (e)

u (e)

(vg)

u (e)

scalability

(vg)

u (e)

(g)

(g)

(vg)

(g)

the force of the impact of anti

(g)

u (e)

u (e)

u (e)

(vg)

(g)

abrasion resistance

(vg)

(g)

u (e)

u (e)

(vg)

u (e)

cutting

u (e)

u (e)

u (e)

u (e)

u (e)

(vg)

regulators degrees

u (e)

u (e)

u (e)

u (e)

(vg)

u (e)

plating

u (e)

u (e)

u (e)

u (e)

(vg)

(g)

anodic oxidation

u (e)

u (e)

u (e)

u (e)

u (e)

u (e)

passivation

u (e)

u (e)

u (e)

u (e)

(vg)

(g)

painting

u (e)

u (e)

u (e)

u (e)

u (e)

u (e)

dimensional stability

(vg)

u (e)

u (e)

u (e)

(vg)

(vg)

fire flower

u (e)

u (e)

u (e)

u (e)

u (e)

u (e)

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