FORT WAYNE, INDIANA, September 27, 2005 — Steel Dynamics, Inc. (NASDAQ: STLD) today announced its Board of Directors approved a third quarter cash dividend of $0.10 per common share, payable on October 14, 2005, to shareholders of record at the close of business on September 30, 2005.

Founded in 1993, Steel Dynamics operates three steelmaking mini-mills which produce a wide range of steel products, including flat-rolled products, such as hot-rolled, cold-rolled and coated steels; wide-flange beams and H-piling; rail; and special-bar-quality round bars. The company also produces joist and decking products for the non-residential construction markets in two fabrication facilities.

Contact: Fred Warner, Investor Relations Manager
(260) 969-3564 or fax (260) 969-3590
f.warner@steeldynamics.com