Steel Dynamics, Inc., together with its subsidiaries, engages in the manufacture and sale of steel products in the United States. The company operates in three segments: Steel Operations, Metals Recycling and Ferrous Resources Operations, and Steel Fabrication Operations. The Steel Operations segment provides a range of sheet steel products, including hot rolled, cold rolled, and coated steel products; structural steel beams, pilings, and rails; special bar quality and merchant bar quality rounds and round-cornered squares; billets and merchant steel products comprising angles, plain rounds, flats, and channels; and merchant beams and specialty structural steel sections. This segment offers its products for automotive, agriculture, energy, construction, commercial, transportation, and industrial machinery markets. The Metals Recycling and Ferrous Resources Operations segment purchases, processes, and resells ferrous products, such as heavy melting steel, busheling, bundled scrap, shredded scrap, steel turnings, and cast iron products; and processes nonferrous products consisting of aluminum, brass, copper, stainless steel, and other nonferrous metals for use in foundry, mill refining, and smelting applications. It also provides liquid pig iron and hot briquetted iron; and iron nugget products. The Steel Fabrication Operations segment fabricates steel building components, which include steel joists, trusses, girders, and decking products for the non-residential construction industry. The company was founded in 1993 and is headquartered in Fort Wayne, Indiana.