United States Steel Corporation is primarily engaged in the production, sale and transportation of steel mill products, coal, coke and taconite pellets (iron ore) in the United States. The Company\'s other businesses include steel mill products distribution, management of mineral resources, management and development of real estate and engineering and consulting services. Through U. S. Steel Kosice (USSK) in the Slovak Republic, the Company is engaged production and sale of steel mill products and coke primarily for the central and western European markets. The Company has five operating segments: Flat-rolled Products, Tubular Products, USSK, USS Real Estate and Straightline Source.