Steel Recycling: Why It's Important and How It Works
25 March 2024
Steel is one of the world's most recycled materials, with around 85% of structural steel beams and plates being manufactured from recycled steel. In this blog, we look at how this extremely high recycling rate has important benefits for both the environment and the economy.
Steel is Highly Recyclable
Steel can be melted down and reused repeatedly without any loss of properties or quality.
Other materials like plastic, wood, and concrete degrade significantly when recycled. But steel maintains its strength, flexibility, and durability no matter how many times it is recycled.
This makes steel highly valuable as a fully reusable material.
Recycling Steel Saves Energy
Steel for recycling comes from end-of-life products, construction demolition, and manufacturing scrap. Items like appliances, vehicles, and steel packaging are collected at drop-off sites. Structural steel from demolished buildings is transported for processing.
Recycling steel saves a tremendous amount of energy and natural resources compared to producing new steel from iron ore. Making steel from recycled scrap uses from 60 to 75% less energy than smelting iron ore. The energy savings from recycling just one ton of steel is enough to power an average home for more than a month. Recycling steel reduces greenhouse gas emissions associated with climate change by keeping millions of tons of steel scrap out of landfills.
How Steel is Collected for Recycling
Once collected, steel scrap is shredded and sorted based on metallurgical properties. A furnace then melts the scrap steel so impurities can float to the surface and be removed.
This molten steel is further refined before alloying elements like chromium and nickel are added to produce the desired steel grade. The recycled steel is then cast into moulds or continuously cast and rolled into new products. These products include structural steel beams, Steel Reinforcing Bars (Rebar), wire rods, and sheet steel.
The entire recycling process uses a fraction of the energy and emissions of primary steel production.
Steel Recycling Process
There are three main sources of steel scrap for recycling: end-of-life products like vehicles and appliances, structural steel demolition like bridges and buildings, and excess scrap from steel manufacturing.
Vehicles and appliances are collected at drop-off recycling sites before being transported to a scrap processing facility. Meanwhile, structural steel from demolished buildings and infrastructure is directly transported for recycling. Excess steel scrap from manufacturing processes is also efficiently cycled back into production.
Closed-Loop Recycling
Steel exhibits a “closed-loop” cycle where steel products are repeatedly recycled into new steel products at the end of their lifespan. This closed-loop recycling system allows steel to be reused infinitely without any loss in performance. For example, steel from recycled cans may find new life as a car, appliance, or construction beam. That product is again recyclable at the end of its life, enabling steel's endless reuse.
Indeed, no other material can match steel's closed-loop recyclability.
Conclusion
Steel recycling is a vital metallurgical process that should be encouraged and supported globally. By understanding the importance and methodology of steel recycling, we can transition towards a sustainable circular economy model built on recycling resources like steel.
In addition to environmental benefits, steel recycling provides economic advantages.
Recycled steel is highly cost-competitive with primary production. With over 80% of steel made from recycled content, the established infrastructure and processes make steel recycling financially feasible. Recycling also reduces dependence on imported iron ore and strengthens domestic steel production. Overall, steel recycling delivers significant cost savings while supporting local economies.
High-Quality Online Steel Fabricators and Suppliers
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Whether building a small residential home or a large commercial building, structural steel is a versatile and reliable option to help you achieve your construction goals. So if you’re looking for a cost-effective solution that won’t compromise on quality, consider using structural steel for your next construction project.