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ZN Information

This information guides you through the properties, benefits and uses for the materials we work with. We are always happy to discuss your needs and the solution that will work best for you and your products.

ZN Information
Zinc Alloy ZA2 – with a high tensile strength, ZL2 is a Zinc based alloy which can be used for hot chamber pressure diecast components or gravity casting. Used for small castings where hardness and high tensile strength are essential, the high copper content of this alloy can reduce the dimensional stability. ZL 2 also suffers from a severe loss of ductility during ageing and should be avoided if post forming of the casting is envisaged. When designing a stressed component using ZL2 further reference should be made to the alloys properties, at elevated temperatures, after natural or artificial ageing and the alloys creep properties.

Alloy DesignationZnAL4Cu3Colour codeWhite + Green
Short designationZL 2Alloy Number.ZL0430

MECHANICAL PROPERTIES

Supplied in diecast form.As CastAged
Tensile strength360 MPa331 MPa
Yield strength283 MPa
Impact strength47 Joules68 Joules
Elongation 50mm7%2%
Shear strength317 MPa214
Compressive yield strength269 MPa183 MPa
Fatigue Strength59
Hardness BHN 500Kg100 max98 max

PHYSICAL PROPERTIES

Melting range379 – 390 degC
Density6.7 g / cm 3
Coefficient of Thermal expansion27.4 um/m deg C
Thermal Conductivity105 W/m deg C
Electrical Conductivity25 % IACS
Electrical Resistivity6.3694 u ohm-cm at 20 degC

Zinc Alloy ZA3 – a general purpose alloy, ZL3 is primarily used for producing castings for a variety of applications on a hot chamber pressure diecasting machine. The alloy’s mechanical and physical properties make it ideal for use in castings for the engineering and automotive industry, household equipment and utensils, office equipment, builders’ hardware, locks and toys. ZL3 is easily machined, buffed, polished, lacquered and electroplated for decorative or functional purposes. When designing a stressed component using ZL3 designers should refer to the alloy’s properties, at elevated temperatures, after natural or artificial ageing and the alloy’s creep properties.

Alloy DesignationZnAL4Colour codeWhite + Yellow
Short designationZL 3Alloy Number.ZL0400

MECHANICAL PROPERTIES

Supplied in diecast form.As CastAged
Tensile strength283 MPa241 MPa
Yield strength221 MPa
Impact strength58 Joules56 Joules
Elongation 50mm10%16%
Shear strength214 MPa
Compressive yield strength413 MPa– MPa
Fatigue Strength48
Hardness BHN 500Kg82 max72 max

PHYSICAL PROPERTIES

Melting range381 – 387 degC
Density6.7 g / cm 3
Coefficient of Thermal expansion27.4 um/m deg C
Thermal Conductivity113 W/m deg C
Electrical Conductivity27 % IACS
Electrical Resistivity6.3694 u ohm-cm at 20 degC

Zinc Alloy ZA5 – ZL5 is generally used for castings that require moderately higher strength and hardness and where dimensional stability is not an important criterion in the product application. ZL5 is often specified for automotive applications in Europe. The alloy contains copper as specified alloying element, this promotes marginally better casting properties than the ZL3 alloy and improves mechanical properties. The nominal 1% makes the alloy more expensive and therefore its use should be restricted to applications requiring its higher properties. ZL5 will accept any finish specified for ZL3. When designing a stressed component using ZL5 further reference should be made to the alloys properties, at elevated temperatures, after natural or artificial ageing and the alloys creep properties.

Alloy DesignationZnAL4Cu1Colour codeWhite + Black
Short designationZL 5Alloy Number.ZL0410

MECHANICAL PROPERTIES

Supplied in diecast form.As CastAged
Tensile strength328 MPa269 MPa
Yield strength221 MPa
Impa ct strength65 Joules54 Joules
Elongation 50mm7%13%
Shear strength262 MPa
Compressive yield strength599.8 MPa
Fatigue Strength56 MPa
Hardness BHN 500Kg91 max80 max

PHYSICAL PROPERTIES

Melting range380 – 386 deg C
Density6.7 g / cm 3
Coefficient of Thermal expansion27.4 um/m deg C
Thermal Conductivity109 W/m deg C
Electrical Conductivity26 % IACS
Electrical Resistivity6.5359 u ohm-cm at 20 deg C

Zinc Alloy ZA8 – ZL8 is designed to extend the application range of zinc alloy diecastings. In the past zinc alloys were considered unsuitable for applications where moderate stress was anticipated at elevated temperatures. ZL8 was specifically developed to improve the creep resistance and offer the best creep resistance of all the pressure diecasting alloys. It should be specified for structural or stressed applications for which other zinc alloys would be unsuitable. Although the strongest of the hot chamber alloys, it all has all of the properties associated with zinc diecasting alloys. The combination of higher strength, excellent dimensional stability, good surface finish and definition make it ideal for visible stressed parts which are subject to elevated temperatures during service. Finishes suitable for traditional pressure diecasting alloys can be applied to ZL8 castings with the same excellent results.

Typical applications for this alloy are under bonnet automotive parts, stressed parts for hazardous or mining applications, stressed electrical or computer parts microwave guides etc.

When designing a stressed component using ZL8 further reference should be made to the alloys properties, at elevated temperatures, after natural or artificial ageing and the alloys creep properties.

Alloy DesignationZnAL8Cu1Colour codeWhite + Blue
Short designationZL 8Alloy Number.ZL0810

MECHANICAL PROPERTIES

Supplied in diecast form.As CastAged
Tensile strength374 MPa297 MPa
Yield strength290 MPa225 MPa
Impact strength42 Joules17 Joules
Elongation 50mm8%20%
Shear strength276 MPa227 MPa
Compressive yield strength252 MPa171 MPa
Fatigue Strength103 MPa
Hardness BHN 500Kg106 max91 max

PHYSICAL PROPERTIES

Melting range374 – 404 deg C
Density6.3 g / cm 3
Coefficient of Thermal expansion27.4 um/m deg C
Thermal Conductivity109 W/m deg C
Electrical Conductivity26 % IACS
Electrical Resistivity6.5359 u ohm-cm at 20 deg C

Zinc Alloy ZA27 – ZL27 is a zinc alloy containing 27% aluminium. It has exceptionally high strength and excellent bearing properties. Originally this alloy was envisaged for use in the sand and gravity diecasting industries but, has subsequently found a niche market as a pressure diecasting alloy using cold chamber diecasting machines. ZL27 offers the extended tool life applicable to zinc alloys which, when combined with its higher strength and hardness makes the alloy an automatic choice when aluminium alloys are unable to meet the service conditions anticipated.

When designing a stressed component using ZL27 further reference should be made to the alloys properties, at elevated temperatures, after natural or artificial ageing and the alloys creep properties.

Alloy DesignationZnAL27Cu2Colour codeWhite + Violet
Short designationZL 27Alloy Number.ZL2720

MECHANICAL PROPERTIES

Supplied in diecast form.As CastAged
Tensile strength426 MPa360 MPa
Yield strength371 MPa317 MPa
Impact strength5 Joules2.2 Joules
Elongation 50mm2.5%3%
Shear strength296 MPa234 MPa
Compressive yield strength385 MPa288 MPa
Fatigue Strength145 MPa
Hardness BHN 500Kg122 max100 max

PHYSICAL PROPERTIES

Melting range376 – 484 deg C
Density5.0 g / cm 3
Coefficient of Thermal expansion26 um/m deg C
Thermal Conductivity125.5 W/m deg C
Electrical Conductivity29.7 % IACS
Electrical Resistivity5.8 u ohm-cm at 20 deg C

High Pressure Diecasting: Pressure die casting in uk

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