United States Steel Corporation produces and sells steel mill products in North America and Europe. The company operates in 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, as well as produces iron ore and coke. This segment serves customers in the service center, conversion, transportation, construction, container, 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; and standard and line pipe and mechanical tubing products. This segment serves customers in the oil, gas, and petrochemical markets. The company also provides transportation services, including railroad and barge operations. In addition, it owns, develops, and manages various real estate assets. The company was founded in 1901 and is headquartered in Pittsburgh, Pennsylvania.