Steel Mills
ArcelorMittal Dofasco resumes cokemaking after emergency maintenance
Written by Laura Miller
October 7, 2025
ArcelorMittal Dofasco experienced an incident at its Hamilton, Ontario, coke plant at the end of September.
The steelmaker reported on Sept. 30 that “urgent maintenance” was needed in its coke plant off-gas systems. The work required coke oven gas from the No. 2 coke plant to be flared for most of that week.
Flaring “produces additional dark orange flames that may be visible to community members,” the company warned.
Four days later, on Oct. 3, Dofasco announced the coke plant had resumed normal, stable operations.
The ArcelorMittal Dofasco plant produces hot-rolled, cold-rolled, galvanized, Galvalume, pre-paint, and tinplate products.
The mill is in the process of transitioning from blast furnace/basic oxygen furnace to direct-reduced iron/electric-arc furnace steelmaking. The company broke ground on the CA$1.8 billion ($1.29 billion USD) decarbonization project in October 2022.
Dofasco expects to complete construction of the 2.5-million-metric-ton DRI furnace and 2.4-million-mt EAF next year. They will then begin a 12- to 18-month transition phase, gradually phasing out BF-BOF steelmaking. The company plans to complete the full transition to DRI-EAF steelmaking by 2028.
Until the switch is complete, ArcelorMittal Dofasco will utilize an existing EAF, which has an annual capacity of ~1.3 million mt, and the No. 2 and No. 4 BFs, which have annual capacities of over 1 million mt and 1.5 million mt, respectively. Last year, the mill produced 3.1 million mt of flat-rolled products, according to the company’s Fact Book 2024.
Laura Miller
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