ArcelorMittal, an iron and steel company, completed the acquisition of Dortmunder Brightstahl, a steel mining and products company. Financial terms were not disclosed. "With the takeover, we are securing the future of Dortmunder Brightstahl, which will become ArcelorMittal Dortmund. Bright steel production complements our wire processing portfolio - with this we cover another part of the value chain for our Wire Solutions division,” Lutz Bandusch, ArcelorMittal Vice President.