The tables below list the most common alloys that we manufacture. Note that we are able to cast to any recognised or special purpose alloy composition. Please contact us for further information. ALUMINIUM
CHEMICAL COMPOSITION LIMITS (AS2239 - 2003) | Element | Chemical Composition, % | Designation A1 | Designation A2 | Designation A5 | Designation A6 | Min. | Max. | Min. | Max. | Min. | Max. | Min. | Max. | | Zinc | 2.1 | 2.7 | 3.0 | 5.0 | 4.0 | 5.0 | 2.0 | 6.0 | | Indium | 0.017 | 0.025 | 0.02 | 0.05 | - | - | 0.01 | 0.02 | | Cadmium | 0.008 | 0.012 | - | 0.005 | - | 0.005 | - | 0.005 | | Silicon | - | 0.20 | - | 0.20 | - | 0.25 | 0.08 | 0.12 | | Iron | - | 0.12 | - | 0.12 | - | 0.25 | - | 0.12 | | Magnesium | - | - | 0.6 | 2.2 | - | - | - | 0.02 | | Titanium | - | - | 0.02 | 0.05 | - | - | - | 0.02 | | Copper | - | 0.006 | - | 0.006 | - | - | - | 0.006 | | Tin | - | - | - | - | 0.05 | 0.25 | - | 0.02 | Other Impurities | | - Each | - | 0.02 | - | 0.02 | - | - | - | 0.02 | | - Total | - | 0.05 | - | 0.05 | - | 0.15 | - | 0.05 | | Aluminium | remainder | remainder | remainder | remainder |
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NOTES:
1. Alloys A1, A2 and A6 are commonly used in Australia for sea water applications.
2. Alloy A5 is used in portable water systems for temperatures up to 85oC.
3. Aluminium alloys activated against self passivation by toxic elements such as Indium, Thallium, Cadmium or Mercury are unacceptable for use in domestic water storage heater applications. ALUMINIUM
CHEMICAL COMPOSITION LIMITS (GALVALUM - Oronzio de Nora) | Element | Chemical Composition, % | Galvalum III | Galvalum IV | Min. | Max. | Min. | Max. | | Zinc | 2.8 | 4.0 | 2.8 | 6.5 | | Indium | 0.01 | 0.02 | 0.01 | 0.02 | | Cadmium | - | - | - | - | | Silicon | 0.11 | 0.21 | 0.08 | 0.21 | | Iron | - | 0.10 | - | 0.12 | | Magnesium | - | - | - | - | | Titanium | - | - | - | - | | Copper | - | 0.006 | - | 0.006 | | Tin | - | - | - | - | Other Impurities | | - Each | - | 0.02 | - | 0.02 | | - Total | - | 0.05 | - | 0.05 | | Aluminium | remainder | remainder |
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MAGNESIUM
CHEMICAL COMPOSITION LIMITS (AS2239 - 2003) | Element | Chemical Composition, % | Cast or extruded high potential | Extruded low potential | Cast low potential | Designation M1 | Designation M2 | Designation M3 | Min. | Max. | Min. | Max. | Min. | Max. | | Aluminium | - | 0.01 | 2.5 | 3.5 | 5.3 | 6.7 | | Zinc | - | 0.02 | 0.7 | 1.3 | 2.5 | 3.5 | | Manganese | 0.50 | 1.3* | 0.20 | 1.5 | 0.25 | 0.40 | | Silicon | - | 0.05 | - | 0.05 | - | 0.05 | | Copper | - | 0.02 | - | 0.006 | - | 0.05 | | Iron | - | 0.03 | - | 0.003 | - | 0.03 | | Nickel | - | 0.001 | - | 0.001 | - | 0.003 | | Calcium | - | 0.04 | - | 0.04 | - | 0.04 | Other Impurities | | - Each | - | 0.05 | - | - | - | - | | - Total | - | 0.30 | - | 0.30 | - | 0.30 | | Magnesium | remainder | remainder | remainder |
* In the range 0.50 to 0.80%, the percentage of manganese is required to be at least 0.5 + (60 x % aluminium).
NOTES:
1. Alloy M1 is high potential anode material and is used in high resistivity soils and waters.
2. Alloys M2 and M3 are low potential anode materials and are used in medium resistivity soils and water. Alloy M2 is also used in hot-water applications for temperatures up to 80oC.
3. In order to minimise the self-corrosion of alloy M2 when used in domestic water storage heater applications, it has been found desirable to maintain the iron content below 0.003%, with 0.20 - 0.60% manganese.
4. Magnesium anodes are not suitable for long term protection in sea water. |
ZINC
CHEMICAL COMPOSITION LIMITS (AS2239 - 2003) | Element | Chemical Composition, % | Designation Z1* | Designation Z2 | Min. | Max. | Min. | Max. | | Cadmium | 0.025 | 0.07 | - | 0.003 | | Aluminium | 0.10 | 0.50 | - | 0.005 | | Silicon | - | 0.005 | - | 0.003 | | Copper | - | 0.005 | - | 0.003 | | Iron | - | 0.005 | - | 0.0014 | | Lead | - | 0.006 | - | 0.003 | Other Impurities | | - Each | - | 0.005 | - | 0.005 | | - Total | - | 0.02 | - | 0.02 | | Zinc | remainder | remainder |
* Corresponds to MIL-A-18001k alloy composition. |
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