(330) 769-2096

 

Name:

Email:

Phone:

Comments:

Have a drawing to include?

(.jpg, .gif, .pdf)

How to select the proper alloy for your zinc die casting application

Creco Cast manufactures small & miniature precision zinc die castings from a wide range of zinc alloys, including Zamak 2, Zamak 3, Zamak 5, Zamak 7, and ZA-8. While hand selecting the proper alloy for your specific application may seem a daunting task, our experienced engineering oriented staff will help you make the best selection for your next zinc die casting.

 

A broad range of mechanical and physical properties makes zinc an attractive choice for many applications.  All data on this page represents approximates and are not absolutes. Data will vary according to alloys and may vary slightly according to the varying testing methods.

Mechanical Properties of Zinc Die Castings Alloys

Alloy Zinc Aluminum Magnesium Bronze / Brass Iron
  Zamak 2 Zamak 3 Zamak 5 Zamak 7 ZA 8 380 AZ-91D SAE 660 C93200 SAE 40 C83600 Class 30 Gray Cast Iron 32510 Malleable Iron
Ultimate Tensile Strength: psi x 103 (MPa) 52 (359) 41 (283) 48 (328) 41 (283) 54 (374) 47 (324) 34 (234) 35 (241) 37 (255) 31 (214) 50 (345)
Yield Strength - 0.2% Offset: psi x 103 (MPa) NA 32 (221) 33 (228) 32 (221) 42 (290) 24 (165) 23 (159) 183 (124) 173 (117) 18 (124) 32 (221)
Elongation: % in 2" 7

10

7 13 6-10 3 3 20 30 nil 10
Shear Strength: psi x 103 (MPa) 46 (317) 31 (214) 38 (262) 31 (214) 40 (275) 27 (186) 20 (138) NA NA 43 (296) 45 (310)
Hardness: Brinnel 100 82 91 80 95-110 80 63 65 60 170-269 110-156
Impact Strength: ft-lb (J) 352 (48) 432 (58) 482 (65) 432 (58) 312 (42) 31 (4) 2.75 (3.7) 64 (8) 115 (15) nil 40-651 (54-88)
Fatigue Strength Rotary Bend - 5x108 cycles psi x 103 (MPa) 8.5 (59) 6.9 (48) 8.2 (57) 6.8 (47) 15 (103) 20 (138) 14 (97) 16 (110) 11 (76) 14 (97) 28 (193)
Compressive Yield Strength - 0.1% Offset: psi x 103 (MPa) 934 (641) 604 (414) 874 (600) 604 (414) 37 (252) NA 23 (159) 467 (317) 37.5 (259) 1096 (752) NA

 

Physical Properties of Zinc Die Castings Alloys

Alloy Zinc Aluminum Magnesium Bronze / Brass Iron
  Zamak 2 Zamak 3 Zamak 5 Zamak 7 ZA 8 380 AZ-91D SAE 660 C93200 SAE 40 C83600 Class 30 Gray Cast Iron 32510 Malleable Iron
Density: lb/cu in (g/cm3) .24 (6.6) .24 (6.6) .24 (6.6) .24 (6.6) .227 (6.3) .098 (2713) .066 (1827) .322 (8913) .318 (8802) .25 (6920) .26 (7198)
Melting Range: oF (oC) 715-734 (379-390) 718-728 (381-387) 717-727 (380-386) 718-728 (381-387) 707-759 (375-404) 1000-1100 (538-593) 875-1105 (557-613) 1570-1790 (854-977) 1570-1850 (854-1010) >2150 (>1177) >2250 (>1232)
Electrical Conductivity: % IACS 25

27

26 27 27.7 27 11.5 12 15 NA 6
Thermal Conductivity: BTU/ft/hr/oF (W/m/hr/oC) 60.5 (104.7)

65.3 (113.0)

62.9 (108.9) 65.3 (113.0) 66.3 (114.7) 55.6 (96.2) 41.8 (72.3) 34 (59) 41.6 (72) 28-30 (48-52) NA
Coefficient of Thermal Expansion 68-212oF (100-200°C) 15.4 (27.8) 15.2 (27.4) 15.2 (27.4) 15.2 (27.4) 12.9 (23.3) 11.8 (21.2) 14 (25.2) 10 (18) 10 (18) 6.7 (12.1) 6.6 (11.9)
Specific Heat: BTU/lb/oF (J/kg/oC) .10 (419) .10 (419) .10 (419) .10 (419) .104 (435)            
Pattern or Die Shrinkage: in/in .006 .006 .006 .006 .007 .006 NA .018 .016 .010 .010

 

Chemical Specifications (per ASTM) (% by weight) of Zinc Die Castings Alloys

Alloy Zinc Aluminum Magnesium Bronze / Brass Iron
  Zamak 2 Zamak 3 Zamak 5 Zamak 7 ZA 8 380 AZ-91D SAE 660 C93200 SAE 40 C83600 Class 30 Gray Cast Iron 32510 Malleable Iron
Aluminum (Al) 3.5-4.3 3.5-4.3 3.5-4.3 3.5-4.3 8.0-8.8            
Magnesium (Mg) .020-.050 .020-.05 .03-.08 .005-.020 015-.030            
Copper (Cu) 2.5-3.0 .25 max8 .75-1.25 .25 max .8-1.3            
Iron (Fe) - max .10

.10

.10 .075 .075            
Lead (Pb) - max .005 .005 .005 .003 .006            
Cadmium (Cd) - max .004 .004 .004 .002 .006            
Tin (Sn) - max .003 .003 .003 .001 .003            
Ni (other)9 - - - .005-.020 -            
Zinc (Zn) Balance Balance Balance Balance Balance            

 

1 3 hr at 610oF and furnace cool.

2 1/4" square specimen unnotched.

3 10mm square specimen unnotched.

4 Comprehensive strength.

5 Previous industry accepted standard.

6 Estimated values to be confirmed by research

7 Values for permanent mold condition which should be similar for other processes.

8 Per ASTM B86--88. *For the majority of commercial applications, a copper content in the range of 0.25 to

0.75% will not adversely affect the serviceability of die castings and should not serve as a basis for rejection.*

9 Zamak alloy ingot for die casting (with the exception of % Ni in No. 7) may contain Ni, Cr, Mn, Si, in amounts of up to 0.02, 0.02, 0.06 and 0.035% respectively.

 

ZA Ingot for foundry and pressure die casting may contain Ni, Cr, or Mn in amounts of up to 0.01% each or 0.03% total.