ArcelorMittal Dofasco | 42,800 followers on LinkedIn. Smarter steel for people and planet | At ArcelorMittal Dofasco, we play a key role in North America’s advanced manufacturing supply chain working with the top automotive, energy, packaging, and construction brands to develop lighter, stronger and more sustainable steel products – from cans to cars. ArcelorMittal Dofasco is Hamilton's largest private sector employer with more than 4,500 employees, shipping 4.5 million net tons of high quality flat carbon steel annually. ArcelorMittal Dofasco’s iconic tagline "Our Product is Steel.