Altos Hornos de M?xico, S.A. de C.V. (AHMSA) is Mexico's largest steelmaker, with a production capacity of more than 3 million tons a year. It makes flat products (plate, hot- and cold-rolled coil, tin-free steel) and long products (heavy and light structural sections, wire rod, wire products). A former government-controlled company privatized in 1991, AHMSA mines its own iron ore and coal to produce steel, and it also produces steam coal. Being vertically integrated gives AHMSA flexibility when raw materials prices vary. AHMSA's parent company is Mexican industrial conglomerate Grupo Acerero del Norte.