Principal subsidiaries
  Percentage of ownership atCountry of
    
    
    
    December 31,Company
    
    Organization
    
    Main activity
    
    2010
    
    
    2009
    
    
    2008Ternium S.A.
    
    Luxembourg
    
    Holding
    
    
    100.00
    %
    
    
    100.00
    %
    
    
    100.00
    %Ternium Investments S.à.r.l. (1)
    
    Luxembourg
    
    Holding
    
    
    100.00
    %
    
    
    
    
    
    
    Ternium Brasil S.A. (2)
    
    Brazil
    
    Holding
    
    
    100.00
    %
    
    
    100.00
    %
    
    
    100.00
    %Siderúrgica do Norte Fluminense S.A. (3)
    
    Brazil
    
    Manufacturing and selling of steel products
    
    
    100.00
    %
    
    
    
    
    
    
    Ylopa  Servicos de Consultadoria Lda. (4)
    
    Portugal
    
    Holding
    
    
    94.38
    %
    
    
    94.38
    %
    
    
    94.38
    %Consorcio Siderurgia Amazonia S.L.U. (5)
    
    Spain
    
    Holding
    
    
    94.38
    %
    
    
    94.38
    %
    
    
    94.38
    %Secor- Servicios Corporativos S.A. (5)
    
    Venezuela
    
    Holding
    
    
    94.38
    %
    
    
    94.38
    %
    
    
    93.44
    %Ternium Internacional España S.L.U. (2)
    
    Spain
    
    Marketing of steel products
    
    
    100.00
    %
    
    
    100.00
    %
    
    
    100.00
    %Siderar S.A.I.C. (6)
    
    Argentina
    
    Manufacturing and selling of flat steel products
    
    
    60.94
    %
    
    
    60.94
    %
    
    
    60.93
    %Impeco S.A. (7)
    
    Argentina
    
    Manufacturing of pipe products
    
    
    60.97
    %
    
    
    60.97
    %
    
    
    60.96
    %Prosid Investments S.C.A. (7)
    
    Uruguay
    
    Holding
    
    
    60.94
    %
    
    
    60.94
    %
    
    
    60.93
    %Inversiones Basilea S.A. (8)
    
    Chile
    
    Purchase and sale of real estate and other
    
    
    60.94
    %
    
    
    60.94
    %
    
    
    60.93
    %Ternium Mexico S.A. de C.V. (9)
    
    Mexico
    
    Holding
    
    
    88.72
    %
    
    
    88.71
    %
    
    
    88.71
    %Hylsa S.A. de C.V. (10)
    
    Mexico
    
    Manufacturing and selling of steel products
    
    
    88.72
    %
    
    
    88.71
    %
    
    
    88.71
    %Las Encinas S.A. de C.V. (10)
    
    Mexico
    
    Exploration, exploitation and pelletizing of iron ore
    
    
    88.72
    %
    
    
    88.71
    %
    
    
    88.71
    %Ferropak Comercial S.A. de C.V. (10)
    
    Mexico
    
    Scrap services company
    
    
    88.72
    %
    
    
    88.71
    %
    
    
    88.71
    %Ferropak Servicios S.A. de C.V. (10)
    
    Mexico
    
    Services
    
    
    88.72
    %
    
    
    88.71
    %
    
    
    88.71
    %Galvacer America Inc (10)
    
    USA
    
    Distributing company
    
    
    88.72
    %
    
    
    88.71
    %
    
    
    88.71
    %Galvamet America Corp (10)
    
    USA
    
    Manufacturing and selling of insulated panel products
    
    
    88.72
    %
    
    
    88.71
    %
    
    
    88.71
    %Transamerica E. & I. Trading Corp (10)
    
    USA
    
    Scrap company
    
    
    88.72
    %
    
    
    88.71
    %
    
    
    88.71
    %Técnica Industrial S.A. de C.V. (10)
    
    Mexico
    
    Services
    
    
    88.72
    %
    
    
    88.71
    %
    
    
    88.71
    %Sefimsa S.A. de C.V. (10)
    
    Mexico
    
    Financial services
    
    
    88.72
    %
    
    
    88.71
    %
    
    
    88.71
    %Ecore Holding S. de R.L. de C.V. (10)
    
    Mexico
    
    Holding
    
    
    88.72
    %
    
    
    88.71
    %
    
    
    88.71
    %Neotec L.L.C. (10)
    
    USA
    
    Holding
    
    
    88.72
    %
    
    
    88.71
    %
    
    
    88.71
    %Treasury Services S.A. de C.V. (10)
    
    Mexico
    
    Financial services
    
    
    88.72
    %
    
    
    88.71
    %
    
    
    88.71
    %APM, S.A. de C.V. (10)
    
    Mexico
    
    Manufacturing and selling of steel products
    
    
    88.72
    %
    
    
    88.71
    %
    
    
    88.71
    %Acedor, S.A. de C.V. (10)
    
    Mexico
    
    Holding
    
    
    88.72
    %
    
    
    88.71
    %
    
    
    88.71
    %Empresas Stabilit S.A. de C.V. (10)
    
    Mexico
    
    Holding
    
    
    88.72
    %
    
    
    88.71
    %
    
    
    88.71
    %Acerus S.A. de C.V. (10)
    
    Mexico
    
    Manufacturing and selling of steel products
    
    
    88.72
    %
    
    
    88.71
    %
    
    
    88.71
    %




---



##### 



Percentage of ownership atCountry of
    
    
    
    December 31,Company
    
    Organization
    
    Main activity
    
    2010
    
    
    2009
    
    
    2008Imsa Monclova S.A. de C.V. (10)
    
    Mexico
    
    Services
    
    
    88.72
    %
    
    
    88.71
    %
    
    
    88.71
    %Ternium Internacional Guatemala S.A. (10)
    
    Guatemala
    
    Selling of steel products
    
    
    88.72
    %
    
    
    88.71
    %
    
    
    88.71
    %Corporativo Grupo Imsa S.A. de C.V. (10)
    
    Mexico
    
    Services
    
    
    88.72
    %
    
    
    88.71
    %
    
    
    88.71
    %Ternium USA Inc. (10)
    
    USA
    
    Manufacturing and selling of steel products
    
    
    88.72
    %
    
    
    88.71
    %
    
    
    88.71
    %Consorcio Minero Benito Juarez Peña Colorada S.A.de C.V. (11)
    
    Mexico
    
    Exploration, exploitation and pelletizing of iron ore
    
    
    44.36
    %
    
    
    44.36
    %
    
    
    44.36
    %Peña Colorada Servicios S.A. de C.V. (11)
    
    Mexico
    
    Services
    
    
    44.36
    %
    
    
    44.36
    %
    
    
    44.36
    %Servicios Integrales Nova de Monterrey S.A. de C.V. (12)
    
    Mexico
    
    Medical and social services
    
    
    66.09
    %
    
    
    66.09
    %
    
    
    66.09
    %Ternium Guatemala S.A.
    
    Guatemala
    
    Manufacturing and selling of steel products
    
    
    88.72
    %
    
    
    88.71
    %
    
    
    88.71
    %Ternium Internacional Nicaragua S.A.
    
    Nicaragua
    
    Manufacturing and selling of steel products
    
    
    88.18
    %
    
    
    88.18
    %
    
    
    88.09
    %Ternium Internacional Honduras S.A. de C.V.
    
    Honduras
    
    Manufacturing and selling of steel products
    
    
    88.01
    %
    
    
    88.00
    %
    
    
    88.00
    %Ternium Internacional El Salvador, S.A. de C.V.
    
    El Salvador
    
    Manufacturing and selling of steel products
    
    
    88.66
    %
    
    
    88.65
    %
    
    
    88.65
    %Ternium Internacional Costa Rica S.A.
    
    Costa Rica
    
    Manufacturing and selling of steel products
    
    
    88.72
    %
    
    
    88.71
    %
    
    
    88.71
    %Ferrasa S.A.S. (13)
    
    Colombia
    
    Manufacturing and selling of steel products
    
    
    54.00
    %
    
    
    
    
    
    
    Perfilamos del Cauca S.A.S. (13)
    
    Colombia
    
    Manufacturing and selling of steel products
    
    
    54.00
    %
    
    
    
    
    
    
    Figuraciones S.A.S. (13)
    
    Colombia
    
    Manufacturing and selling of steel products
    
    
    54.00
    %
    
    
    
    
    
    
    Siderúrgica de Caldas S.A.S. (13)
    
    Colombia
    
    Manufacturing and selling of steel products
    
    
    54.00
    %
    
    
    
    
    
    
    Recolectora Industrial de Colombia S.A. (1)
    
    Colombia
    
    Scrap services company
    
    
    28.70
    %
    
    
    
    
    
    
    Procesadora de Materiales Industriales S.A. (1)
    
    Colombia
    
    Scrap services company
    
    
    32.40
    %
    
    
    
    
    
    
    Desechos Industriales de Colombia S.A. (1)
    
    Colombia
    
    Scrap services company
    
    
    29.70
    %
    
    
    
    
    
    
    Tenigal S. de R.L. de C.V. (14)
    
    Mexico
    
    Manufacturing and selling of steel products
    
    
    51.00
    %
    
    
    
    
    
    
    Ternium Investments Switzerland AG (2)
    
    Switzerland
    
    Holding
    
    
    100.00
    %
    
    
    
    
    
    
    Ternium Internacional S.A. (15)
    
    Uruguay
    
    Holding and marketing of steel products
    
    
    100.00
    %
    
    
    100.00
    %
    
    
    100.00
    %Ternium International Ecuador S.A. (16)
    
    Ecuador
    
    Marketing of steel products
    
    
    100.00
    %
    
    
    100.00
    %
    
    
    100.00
    %Ternium International USA Corporation (16)
    
    USA
    
    Marketing of steel products
    
    
    100.00
    %
    
    
    100.00
    %
    
    
    100.00
    %Ternium Internationaal B.V. (16)
    
    Netherlands
    
    Marketing of steel products
    
    
    100.00
    %
    
    
    100.00
    %
    
    
    100.00
    %Ternium Internacional Perú S.A. (16)
    
    Peru
    
    Marketing of steel products
    
    
    100.00
    %
    
    
    100.00
    %
    
    
    100.00
    %Ternium Internacional de Colombia S.A. (16)
    
    Colombia
    
    Marketing of steel products
    
    
    100.00
    %
    
    
    100.00
    %
    
    
    100.00
    %Ternium Procurement S.A. (15)
    
    Uruguay
    
    Procurement services
    
    
    100.00
    %
    
    
    100.00
    %
    
    
    100.00
    %Ternium International Inc. (15)
    
    Panama
    
    Marketing of steel products
    
    
    100.00
    %
    
    
    100.00
    %
    
    
    100.00
    %Ternium Engineering & Services S.A. (17)
    
    Uruguay
    
    Engineering and other services
    
    
    100.00
    %
    
    
    100.00
    %
    
    
    




---



##### 



Percentage of ownership atCountry of
    
    
    
    December 31,Company
    
    Organization
    
    Main activity
    
    2010
    
    
    2009
    
    
    2008Ternium Ingeniería y Servicios de Argentina S.A.
    
    Argentina
    
    Engineering and other services
    
    
    100.00
    %
    
    
    100.00
    %
    
    
    Ternium Ingeniería y Servicios de Mexico S.A. de C.V.
    
    Mexico
    
    Engineering and other services
    
    
    100.00
    %
    
    
    100.00
    %
    
    
    Ternium Treasury Services S.A. (15)
    
    Uruguay
    
    Financial services
    
    
    100.00
    %
    
    
    100.00
    %
    
    
    100.00
    %Ternium Treasury Services B.V. (15)
    
    Netherlands
    
    Financial services
    
    
    100.00
    %
    
    
    100.00
    %
    
    
    100.00
    %Ferrasa Panamá, S.A. (18)
    
    Panama
    
    Manufacturing and selling of steel products
    
    
    54.00
    %
    
    
    
    
    
    
    Aceros Transformados de Panamá, S.A. (18)
    
    Panama
    
    Manufacturing and selling of steel products
    
    
    54.00
    %
    
    
    
    
    
    
    Ternium Investments S.A. (formerly Dirken Company S.A.) (19)
    
    Uruguay
    
    Holding
    
    
    
    
    
    
    100.00
    %
    
    
    100.00
    %
 (1)
    
    Incorporated in the fourth quarter of 2010.(2)
    
    Indirectly through Ternium Investments S.à.r.l. Total voting rights held 100.00%(3)
    
    Indirectly through Ternium Brasil S.A. Total voting rights held: 100.00%. Incorporated during
2010.(4)
    
    Indirectly through Ternium Investments S.á.r.l. (85.62%) and Prosid Investments S.C.A.
(8.76%). Total voting rights held: 100.00%(5)
    
    Indirectly through Ylopa  Servicos de Consultadoría Lda. Total voting rights held: 100.00%.
As of April 25, 2008, Consorcio Siderurgia Amazonia S.L.U. was relocated into Spain (formerly
Cayman Islands)(6)
    
    Indirectly through Ternium Internacional España S.L.U. Total voting rights held: 60.94%(7)
    
    Indirectly through Siderar S.A.I.C and Ternium Internacional S.A. Total voting rights held
100.00%(8)
    
    Indirectly through Siderar S.A.I.C. Total voting rights held 100.00%(9)
    
    Indirectly through Siderar S.A.I.C., Inversiones Basilea S.A. and Ternium Internacional
España S.L.U. Total voting rights held 99.93%(10)
    
    Indirectly through Ternium Mexico S.A. de C.V. Total voting rights held: 100.00%(11)
    
    Indirectly through Ternium Mexico S.A. de C.V. Total voting rights held: 50.00%. Consolidated
under the proportionate consolidation method.(12)
    
    Indirectly through Ternium Mexico S.A. de C.V. Total voting rights held: 74.50%(13)
    
    Indirectly through Ternium Internacional España S.L.U. Total voting rights held: 54.00%.
Incorporated during 2010. (See note 3 to our consolidated financial statements as of December
31, 2010)(14)
    
    Indirectly through Ternium Internacional España S.L.U. Total voting rights held: 51.00%.
Incorporated during 2010. (See note 31 to our consolidated financial statements as of December
31, 2010)(15)
    
    Indirectly through Ternium Investments Switzerland AG. Total voting rights held: 100.00%(16)
    
    Indirectly through Ternium Internacional S.A. Total voting rights held 100.00%(17)
    
    Indirectly through Ternium Internacional Inc. Total voting rights held 100.00%(18)
    
    Indirectly through Ternium Treasury Services S.A. Total voting rights held: 54.00%.
Incorporated during 2010. (See note 3 to our consolidated financial statements as of December
31, 2010)(19)
    
    This company was dissolved as of December 6, 2010.