Steel Dynamics, Inc. (SDI) is a company engaged in steel production and metal recycling. It operates through four business segments: Steel, Metals Recycling, Steel Fabrication, and Aluminum. The Steel division specializes in producing steel from ferrous scrap and scrap substitutes. Metals Recycling covers ferrous and nonferrous scrap processing, transportation, marketing, brokerage, and scrap management services. Steel Fabrication produces non-residential building components, including joists, trusses, girders, and steel decks. The Aluminum business offers recycled aluminum flat-rolled products. The company serves construction, automotive, manufacturing, transportation, and other industries.