AHMSA is a fully integrated steel company based in Mexico, whose production ranges from basic raw materials to finished higher value-added products. With two plants in Monclova, Coahuila, Altos Hornos de México is the largest steelwork in Mexico. AHMSA is a national leader in production and sales of flat products such as hot rolled strip, plate, cold-rolled strip, tinplate and tin-free steel. It also produces long products such as structural shapes, light shapes and wire rod.