AK Steel Holding Corporation, through its subsidiary, AK Steel Corporation, produces flat-rolled carbon, and stainless and electrical steel products in the United States and internationally. It produces flat-rolled carbon steel products, including coated, cold-rolled, and hot-rolled carbon steel products; grain-oriented specialty stainless and electrical steels; and carbon and stainless steel tubing products. The company also buys and sells steel and steel products, as well as other materials; and produces metallurgical coal from reserves in Somerset County, Pennsylvania. It sells its flat-rolled carbon steel products, primarily to automotive manufacturers and their suppliers; customers in the infrastructure and manufacturing markets, including the manufacturers of power transmission and distribution transformers, who produce equipment for the electrical grid, as well as electrical motors and generators; and manufacturers of heating, ventilation, and air conditioning equipment, and appliances. The company also sells its carbon steel products to distributors, service centers, and converters. AK Steel Holding Corporation was founded in 1993 and is headquartered in West Chester, Ohio. As of March 13, 2020, AK Steel Holding Corporation operates as a subsidiary of Cleveland-Cliffs Inc.