AK Steel Holding Corporation is a producer of flat-rolled carbon, stainless and electrical steels, and tubular products through its subsidiary, AK Steel Corporation (AK Steel). The Company also operates blast furnaces and electric arc furnaces. As of December 31, 2016, its operations included eight steelmaking and finishing plants, two coke plants and two tube manufacturing plants across states, including Indiana, Kentucky, Michigan, Ohio, Pennsylvania and West Virginia, and a tube manufacturing plant in Mexico. These operations produce flat-rolled carbon, specialty stainless and electrical steels that it sells in sheet and strip form, and carbon and stainless steel that it finishes into welded steel tubing. It also produces metallurgical coal through its subsidiary, AK Coal Resources, Inc. In addition, the Company operates trading companies in Mexico and Europe that buy and sell steel and steel products and other materials.