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Zinkberatung e.V. – 1981 Grade G‑ZnAl8Cu1: Superior Casting Alloy

The material ZnAl8Cu1, a fine zinc block metal alloy acc. to ASTMB 669, german marking ZA 8, is the best alloy for casting with continuous form. It has the smallest strength, but best surface treatment characteristics opposite the marks ZnAl12Cu1 and ZnAl27Cu2. The alloy is outstanding pressure-tight, even in thin cross sections, excellently machinably and on high polish sharpening and polishingable. The alloy is used mainly for sand and ingot casting, in addition, for die casting on cold chamber machines. The alloy ZA 8 exhibits a clearly improved creep rupture behaviour in relation to the alloy Z 430 (G-ZnAl4Cu3).

Properties

General

PropertyTemperatureValue

Density

20.0 °C

6.3 g/cm³

Mechanical

PropertyTemperatureValueComment

Elastic modulus

20.0 °C

85 GPa

Elongation A50

20.0 °C

1 - 2 %

Hardness, Brinell

20.0 °C

85 - 90 [-]

Poisson's ratio

23.0 °C

0.3 [-]

Typical for Zinc Aluminium

Tensile strength

20.0 °C

220 - 275 MPa

Yield strength Rp0.2

20.0 °C

190 - 200 MPa

Thermal

PropertyTemperatureValueComment

Coefficient of thermal expansion

23.0 °C

2.2E-5 - 2.8E-5 1/K

Typical for Zinc Aluminium

Melting point

375 - 485 °C

Typical for Zinc Aluminium

Specific heat capacity

23.0 °C

393 - 525 J/(kg·K)

Typical for Zinc Aluminium

Thermal conductivity

23.0 °C

105 - 125 W/(m·K)

Typical for Zinc Aluminium

Chemical properties

PropertyValue

Aluminium

8 - 8.8 %

Cadmium

3E-3 %

Copper

0.8 - 1.3 %

Iron

0.1 %

Lead

4E-3 %

Magnesium

0.02 - 0.03 %

Tin

2E-3 %

Zinc

89.76 %

Technological properties

Property
Processing methods

permanent mould casting


Metal

  1. EN 13835: GGG‑NiMn 23/4 Cast Iron – High‑Strain, Cryogenic‑Grade Material
  2. EN 13835 GGL‑NiCr 30/3: High‑Temperature, Corrosion‑Resistant Cast Iron for Pumps, Boilers, and Turbochargers
  3. Zinc Beratung e.V. 1981 – G‑ZnAl12Cu1 Casting Properties & Applications
  4. Zinkberatung e.V. 1981: Grade G‑ZnAl27Cu2 Cast Alloy Specification
  5. High-Performance ZnAl27Cu2 Alloy – Grade G, Heat Treated for 120 °C Applications
  6. EN 12844 Grade G‑ZnAl4Cu3: Advanced Casting Alloy for High‑Strength Applications
  7. EN 12844: Grade G‑ZnAl6Cu1 Casting Specifications & Performance
  8. EN 1561 GJL-150: Comprehensive Cast Condition Specifications
  9. EN 1561 Grade GJL-200: Standard Cast Condition for High-Performance Applications
  10. EN 1561 Grade GJL-250 Cast – Key Properties & Applications