Galvanised Steel Recycling in Melbourne: Why the Zinc Coating Matters

Galvanised steel is still graded as standard steel scrap, so the zinc coating alone rarely reduces its value. During recycling, the zinc coating vaporises and is recovered for reuse, while contamination, not galvanising, is what usually lowers a load’s grade. Sorting your scrap before you arrive helps protect its value, and any cutting or welding should be done with proper ventilation.

Key Takeaways

• The zinc coating does not stop galvanised steel from being recycled. It vaporises during melting, gets captured in furnace dust, and is recovered for reuse, so the coating rarely lowers your price.
• A clean load of galvanised steel is generally graded as standard steel scrap. Contamination is the real issue. Plastic clips, rubber seals, concrete, timber or copper fittings left attached can lower the grade of an entire load.
• Sorting before you arrive protects what your scrap is worth. A few minutes pulling out contamination often pays for itself across a full bin.
• Cutting or welding galvanised steel releases zinc oxide fume that can cause metal fume fever. Always work in a well-ventilated area and wear appropriate respiratory protection.

Galvanised steel is present on commercial and construction sites across Melbourne, from roofs and fencing to structural framing and ducting. When sorting a load of scrap, it’s common to wonder whether that silvery zinc coating will affect its value or whether a scrap yard will even accept it. The good news is that galvanised steel is still steel, and it still has value as scrap. While the zinc coating plays an important role in protecting steel from corrosion, it usually has very little impact on how a clean load is graded. Understanding how galvanised steel is recycled can help you maximise the value of your scrap.

What Is Galvanised Steel and Where Do You See It?

Galvanising involves dipping steel into molten zinc, creating a protective coating that helps prevent rust for decades. Unlike paint, the zinc forms a bonded metallic layer that becomes part of the steel itself. That’s why builders rely on galvanised steel, it can withstand the elements for years with very little maintenance. In fact, you’ll probably come across more galvanised steel than you realise, and much of it eventually finds its way to steel recycling in Melbourne yards. Common examples on commercial and construction sites include:

• Roof sheeting and wall cladding
• Fencing, gates, and posts
• Structural framing and purlins
• Cable trays, ducting, and guttering
• Rainwater goods and tanks

At the end of its service life, all of these products can be recycled as ferrous scrap.

What Happens to the Zinc Coating During Recycling?

This is where the zinc coating often causes confusion. Steel melts at more than 1,400°C, while zinc boils at around 907°C. As galvanised steel is melted in the furnace, the zinc coating vaporises well before the steel reaches its melting point. Rather than being wasted, the zinc is captured in furnace dust, recovered and reused, while the remaining steel continues through the recycling process.

In the galvanising industry, over 80 per cent of the zinc that is available for recycling is successfully reclaimed, much of it recovered from scrap like this. The Galvanisers Association of Australia states the coating has no impact whatsoever on recyclability, with steel emerging clean and ready for new products.

How Does Galvanised Steel Affect Your Scrap Price in Melbourne?

So what does this mean for your scrap value? A clean load of galvanised steel is generally purchased as standard steel scrap, so the zinc coating alone rarely affects the price you receive. What does reduce value is contamination.

Plastic clips, banding, rubber seals, concrete, timber or copper fittings left attached can cause an entire load to be downgraded. Spending a few minutes removing contamination before you arrive can make a noticeable difference to the final payout.

For commercial customers using scrap metal bins, keeping galvanised steel free from contamination throughout a project can help maximise returns across multiple bin collections while making the recycling process more efficient.

In Closing

The zinc coating does play a role in the recycling process, but it rarely reduces the value of a clean load. In most cases, contamination has a much bigger impact on grading and price than the galvanised coating itself.

If you’re clearing a large commercial or construction site, SRS Metals can arrange collection. Smaller loads can be dropped off at one of our yards, and our team can help you determine the best location before you arrive. If you’d like to arrange a commercial pickup or have questions about grading your scrap, contact us at enquiries@srsmetals.com.au.