United States Steel Corporation produces and sells flat-rolled and tubular steel products primarily in North America and Europe. It operates through three segments: Flat-Rolled Products (Flat-Rolled), U. S. Steel Europe (USSE), and Tubular Products (Tubular). The Flat-Rolled segment offers slabs, rounds, strip mill plates, sheets, and tin mill products. This segment serves customers in the service center, conversion, automotive, construction, container, and appliance and electrical markets. The USSE segment provides slabs, sheets, strip mill plates, tin mill products, and spiral welded pipes, as well as heating radiators and refractory ceramic materials. This segment serves customers in the construction, service center, conversion, container, transportation, appliance and electrical, oil, gas, and petrochemical markets. The Tubular segment offers seamless and electric resistance welded steel casing and tubing products; and standard and line pipe and mechanical tubing products primarily to customers in the oil, gas, and petrochemical markets. The company also provides railroad services; and owns, develops, and manages various real estate assets. United States Steel Corporation was founded in 1901 and is headquartered in Pittsburgh, Pennsylvania.