Steel Dynamics Inc, 2670 S 700 E, Columbia City, IN 46725, US

Founded in 1993, Steel Dynamics, also known as SDI, is one of the largest producers of carbon steel products. It operates more than five electric-furnace minimills and has over 3,500 employees. The company has various divisions that include flat roll, structural and rail and engineered bar product divisions. SDI manufactures a wide variety of products, including rails and flat-rolled steels. Its subsidiary, New Millennium Building Systems, produces joists, girders and decking for nonresidential construction projects. SDI manufactures various types of steels, including pickled, cold-rolled, galvanized and painted flat-roll steels. Additionally, the structural and rail division of the company produces flange beams of a variety of flange sizes and weights. Steel Dynamics is located in Columbia City, Ind.