Big integrated steel mills like those operated by U.S. Steel and ArcelorMittal in Northwest Indiana have forged iron in towering blast furnaces that make high-quality metal for cars, appliances, and ...
DULUTH — Cleveland-Cliffs will idle a blast furnace at Indiana Harbor, its latest production adjustment as it uses more electric-arc furnaces and more scrap metal to make steel. Blast furnace 4 at ...
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