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Create free account to monitor CLFarcelormittal usa is part of arcelormittal, the world’s leading steel and mining company. guided by a philosophy to produce safe, sustainable steel, we are a leading supplier of quality steel products in major north american markets including automotive, construction, pipe and tube, appliance, container and machinery. arcelormittal usa employs more than 20,000 people at 27 operations across 13 of the united states.