As a consequence of the implementation of the "Plan de Competitividad Conjunto AHV - Ensidesa", in December 1994 the CSI Group (Corporación Siderúrgica Integral) was formed, and it in turn was reorganized in 1997 forming the Aceralia Iron and Steel Corporation.
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In the 1990s, following a series of mergers joined it with Arcelor.
Vizcaya | Nueva Vizcaya | Los Altos | Solano, Nueva Vizcaya | Los Altos, California | Bagabag, Nueva Vizcaya | Vizcaya Bridge | Altos (Paraguay) | Altos | Villa Vizcaya | Pinos Altos, New Mexico | Pinos Altos | Nueva Vizcaya, New Spain | Hornos Island | Durango (Vizcaya) | Altos de Chavón |