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K A Y E M - M A Z A K  2

Z n A l 4 C u 3
EN1774 ZL0430, ASTM B86 (AC43 A)

Kayem (also known as Mazac 2) is a zinc based alloy which can be gravity cast or pressure diecast by the hot chamber process.

One of the major uses of Kayem is for gravity casting of press and moulding tools. The alloy is easy to cast close to finished form and redundant tooling can be remelted and re-used providing it is not contaminated with other materials, particularly lead or solder.

Kayem is also pressure diecast where it's high as cast strength and hardness are advantageous or where it's excelent fluidity is needed for complex decorative items. However dimensional stability and retention of mechanical properties over a period of years or when subjected to higher service temperatures are not as good as Mazak 3, Mazak 5 or Mazak 8.

Mechanical Properties As-cast Aged Sand
Tensile Strength (MPa) 360 331 252
Shear Strength (MPa) 317 214 227
Elongation (% in 51mm) 7 2 3
Hardness (Brinell - 500Kg) 100 98 100
Impact Strength (Energy, Joules) 47 68 7.4
Fatigue Strength 5 x 108 cycles (MPa) 58.6 0


Physical properties  
Density 6,700 Kg/m3 at 21°C
Solidification shrinkage 1.25%
Casting shrinkage 0.6% (pressure diecast)
Freezing range 379 - 390°C
Casting temperature pressure 400 - 425°C
Casting temperature gravity 420 - 430°C
Specific heat capacity 418.7 J/Kg/°C at 20 - 100°C
Thermal expansion 27 x 10-6 linear per °C at 20 - 100°C
Thermal conductivity 104.7 W/m/hr/m2/°C at 70 - 140°C
Electrical conductivity 25% IACS
Electrical resistance 6.3694 u ohm cm at 20°C


TYPICAL ANALYSIS

Alloying elements  
Aluminum 4.0%
Copper 2.9%
Magnesium 0.05%
 
Impurities  
Iron < 0.01%
Lead < 0.003%
Cadmium < 0.003%
Tin < 0.001%
Nickel < 0.001%
Thallium < 0.001%
Indium < 0.0005%
Manganese < 0.01%