European steelmakers can reduce emissions without removing the supply-chain risks tied to essential imported inputs. Blast furnaces and electric-arc furnaces rely on different materials, and their quality, availability and cost can affect production, saleable output and expected cash flows.
Different routes, different critical inputs
Blast-furnace steelmaking uses metallurgical coal to produce coke, which must be strong and reactive enough to support the furnace burden. Replacing coking coal with a cheaper grade can weaken coke, affect gas permeability, increase fuel consumption and ultimately reduce furnace output. The delivered price of a tonne of coal therefore does not show its value without information on coke yield and quality.
Coal is not the only operating variable. Imported pulverised coal and the systems used to inject it also affect blast-furnace production. European Union plants face Emissions Trading System (EU ETS) costs on covered ironmaking emissions, but those costs do not remove the engineering need for a stable furnace. A plant’s direct charge depends on its regulated emissions and allowance allocation.
Electric-arc furnaces shift the main exposures to scrap composition, electricity, refractory performance and consumables. Large graphite electrodes must withstand high current and mechanical stress; breakage can interrupt heats and damage equipment. Their economics combine purchase price, consumption per tonne of steel, delivery reliability and the cost of unplanned furnace downtime.
Electrode supply also depends on specialised carbon feedstocks and baking technologies, so a simple comparison of electricity-related emissions does not capture the full supply risk. Both production routes rely on globally concentrated industrial inputs and expose facilities to suppliers, technical specifications and commodity movements beyond their immediate control.
The suitable route also depends on a mill’s product mix. Long products can often tolerate different scrap specifications from high-quality flat products. Automotive sheet may have stricter requirements for residual elements and surface quality than reinforcing bar. If an electric-arc furnace needs direct-reduced iron to dilute impurities, the mill takes on another critical input and potentially another energy-intensive step, affecting the route’s real carbon benefit and adding dependence on imported ore.
CBAM does not cover every production input
The Carbon Border Adjustment Mechanism (CBAM) applies to specified iron and steel products imported into the European Union. Coking coal, graphite electrodes and many industrial consumables are not automatically covered under the steel category.
High electricity or process emissions at an overseas electrode manufacturer do not by themselves create a legal CBAM charge on an electrode. The electrode’s actual customs classification must be included in the binding scope. That distinction matters when companies assess the carbon and supply-chain implications of production choices.
Buyers of finished steel may see a carbon benefit from an electric-arc-furnace route, but still need to assess alloy quality, surface properties, residual elements and downstream processing requirements. A low electricity price in a particular hour is not sufficient if scrap quality is poor or electrode availability restricts the melt schedule.
Procurement and process planning
Procurement measures include qualifying alternative electrodes, closely monitoring electrode consumption, investing in scrap sorting and contracting for power flexibility. Maintenance teams should track electrode breakage, refractory wear and furnace availability alongside price movements.
Those measures cannot replace a coherent process plan. An electric-arc furnace can respond to electricity prices and operate flexibly within metallurgical constraints, while a blast furnace has a more continuous thermal cycle. A project that reduces nominal emissions but has higher reject rates or electrical downtime can fail to deliver its forecast cash-flow gains.
Investors can assess resilience by identifying the five most critical consumables, ranked by criticality rather than expenditure alone. The assessment should consider geographic supply concentration, qualification time, contractual indexation, minimum operating stock and the tonnes of saleable steel that could be lost in a disruption. A small item can have consequences far greater than its share of operating costs suggests.
The steel transition will change which imported consumables determine competitiveness, not eliminate reliance on them. Companies that manage graphite, scrap quality and electricity as one operational system will be better prepared than those that assume switching from coal to an electric furnace resolves the carbon and supply-chain challenge.