Scrap is the decarbonisation lever for steel
Electric arc furnaces run on scrap and emit a fraction of the CO₂ of the blast-furnace route. Scrap quality is now a climate variable.
Steel made through the blast furnace–basic oxygen route emits roughly 1.8–2.3 tonnes of CO₂ per tonne of steel. The electric arc furnace (EAF) route, charged mainly with ferrous scrap, sits closer to 0.25–0.4 tonnes — and falls further as the electricity supply decarbonises.
That makes scrap availability and cleanliness a direct input to national decarbonisation plans, not just a commercial matter.
Residuals are the constraint
Copper, tin and nickel cannot be removed from liquid steel by ordinary refining. Once they enter the melt, they stay — causing surface cracking in flat products. Motors, wiring harnesses and copper-bearing attachments left in shredded scrap are therefore the single biggest limit on how much scrap high-grade mills can accept.
Careful dismantling before shredding, and honest declaration of copper content, is what keeps a supplier qualified with quality-sensitive mills.
What buyers check
Density and sizing for furnace charging, absence of sealed containers and closed vessels, radiation clearance, and freedom from oil and free liquids. These four checks account for the majority of rejected loads worldwide.