United States Steel Corp. engages in the manufacturing and selling of steel products. It operates through the following business segments: Flat-Rolled Products, U.S. Steel Europe, and Tubular Products. The Flat-Rolled Products segment includes managing steel plants and production facilities that manufacture steel slabs, rounds, strip mill plates, sheets, tin mill, iron ore, and coke. The U.S. Steel Europe segment produces and markets strip mill plates, spiral welded pipe, heating radiators, refractory ceramic materials. The Tubular Products segment is involved in manufacturing and trading seamless and electric resistance welded steel casing and tubing. line pipe, and mechanical tubing. The company was founded in 1901 by Andrew Carnegie, John Pierpont Morgan, Charles Michael Schwab and Elbert Henry Gary and is headquartered in Pittsburgh, PA.