Appendix A - Suitable Materials
- Most ferrous materials are suitable to be hot dip galvanized, including sound stress-free castings.
- Non-ferrous materials such as brass, aluminium and copper are not suited to the hot dip galvanizing process.
- It is not recommended to galvanize stainless steels.
- Most hot rolled or cold formed steels, including structural angles, UB’s, UC’s, welded beams, channels, welded CHS, RHS & SHS, reinforcement steels and fastener grade steels can be galvanized. In general, the mechanical properties of structural steels are not affected by the galvanizing process.
- High strength steel up to 340HV are also able to be galvanized when acid pickling is not used in the pre-treatment of the steel.
- Steel composition (particularly silicon and phosphorus content) can affect the characteristics of the hot dip galvanized coating.
- Sulphur-containing free-cutting steels (for example S1214) are normally unsuitable for hot dip galvanizing.
- Grey cast iron and malleable cast iron can be galvanized, but special considerations need to be met. For more information, refer to Clauses 2 and 9 of AS/NZS 2312.2.
- Combinations of ferrous materials or surface conditions
- Fabrications containing a combination of castings and steels, or rusted and mill scaled surfaces may be abrasive blast cleaned before galvanizing to provide a more consistent initial surface finish.
- Weld slags must be removed, which can be done via chipping, grinding, or using a pneumatic needle gun.
- Brazed assemblies may be galvanized, but check first with your galvanizer.
- Soft soldered assemblies cannot be galvanized.
Appendix B - Identification & Marking
The type of identification needed for steel articles influences the recommended method of identification.
For permanent identification, recommended methods are:
- Heavily embossed markings
- Punched markings
- Welded markings
Before and after galvanizing: the recommended method is the use of heavily embossed metal tags, generally attached to the article via wire.
Prior to galvanizing: recommended methods are water-based paints or marking pens.
Indentification methods not acceptable:
- Oil-based paints or marking pens
Oil-based paints or marking pens and adhesive residue from stickers cannot be fully or effectively removed by the normal pre-treatment performed during the galvanizing process and will generally result in ungalvanized areas on the article where the identification was located.
For more information visit Galvanizers Association Of Australia to download the PDF.