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BASIS OF PRESENTATION (Tables)
 12 Months Ended
Dec. 31, 2017
Disclosure of notes and other explanatory information [Abstract]  
Disclosure of interests in subsidiaries
Detailed below are the companies whose financial statements have been consolidated and accounted for interest in these consolidated financial statements
 
 
Country of
 
 
 
Percentage of ownership
at December 31,
Company
 
Organization
 
Main activity
 
2017
 
2016
 
2015
Ternium S.A.
 
Luxembourg
 
Holding
 
100.00
%
 
100.00
%
 
100.00
%
Ternium Investments S.à.r.l.
 
Luxembourg
 
Holding
 
100.00
%
 
100.00
%
 
100.00
%
Ternium Solutions A.G. (1)
 
Switzerland
 
Services
 
100.00
%
 
100.00
%
 
100.00
%
Ternium Participaçoes S.A. (formerly Ternium Brasil S.A.) (1)
 
Brazil
 
Holding
 
100.00
%
 
100.00
%
 
100.00
%
Ternium Investments Switzerland AG (1)
 
Switzerland
 
Holding
 
100.00
%
 
100.00
%
 
100.00
%
Ternium Internacional España S.L.U. (1)
 
Spain
 
Marketing of steel products
 
100.00
%
 
100.00
%
 
100.00
%
Ternium USA Inc. (1)
 
USA
 
Manufacturing and selling of steel products
 
100.00
%
 
100.00
%
 
100.00
%
Ternium Argentina S.A. (formerly Siderar S.A.I.C.) (2)
 
Argentina
 
Manufacturing and selling of flat steel products
 
60.94
%
 
60.94
%
 
60.94
%
Impeco S.A. (3)
 
Argentina
 
Manufacturing of pipe products
 
60.97
%
 
60.97
%
 
60.97
%
Prosid Investments S.A. (4)
 
Uruguay
 
Holding
 
60.94
%
 
60.94
%
 
60.94
%
Ternium Mexico S.A. de C.V. (5)
 
Mexico
 
Holding
 
88.78
%
 
88.78
%
 
88.72
%
Hylsa S.A. de C.V. (6)
 
Mexico
 
Manufacturing and selling of steel products
 
88.78
%
 
88.78
%
 
88.72
%
Las Encinas S.A. de C.V. (6)
 
Mexico
 
Exploration, exploitation and pelletizing of iron ore
 
88.78
%
 
88.78
%
 
88.72
%
Ferropak Comercial S.A. de C.V. (6)
 
Mexico
 
Scrap services company
 
88.78
%
 
88.78
%
 
88.72
%
Galvamet America Corp (6)
 
USA
 
Manufacturing and selling of insulated panel products
 
88.78
%
 
88.78
%
 
88.72
%
Transamerica E. & I. Trading Corp. (6)
 
USA
 
Scrap services company
 
88.78
%
 
88.78
%
 
88.72
%
Técnica Industrial S.A. de C.V. (6)
 
Mexico
 
Services
 
88.78
%
 
88.78
%
 
88.72
%
Acedor, S.A. de C.V. (6)
 
Mexico
 
Holding
 
88.78
%
 
88.78
%
 
88.72
%
Galvacer America Inc (7)
 
USA
 
Distributing company
 
—

 
88.78
%
 
88.72
%
Ternium Gas México S.A. de C.V. (8)
 
Mexico
 
Energy services company
 
88.78
%
 
88.78
%
 
88.72
%
Ternium Internacional Guatemala S.A. (9)
 
Guatemala
 
Selling of steel products
 
99.98
%
 
99.98
%
 
99.98
%
Consorcio Minero Benito Juarez Peña Colorada S.A.de C.V. (10)
 
Mexico
 
Exploration, exploitation and pelletizing of iron ore
 
44.39
%
 
44.39
%
 
44.36
%
Peña Colorada Servicios S.A. de C.V. (10)
 
Mexico
 
Services
 
44.39
%
 
44.39
%
 
44.36
%
Exiros B.V. (10)
 
Netherlands
 
Procurement and trading services
 
50.00
%
 
50.00
%
 
50.00
%
Servicios Integrales Nova de Monterrey S.A. de C.V. (11)
 
Mexico
 
Medical and Social Services
 
66.14
%
 
66.14
%
 
66.09
%
Ternium Internacional Nicaragua S.A.
 
Nicaragua
 
Manufacturing and selling of steel products
 
99.38
%
 
99.38
%
 
99.38
%
Ternium Internacional Honduras S.A. de C.V.
 
Honduras
 
Manufacturing and selling of steel products
 
99.18
%
 
99.18
%
 
99.18
%
Ternium Internacional El Salvador S.A. de C.V.
 
El Salvador
 
Manufacturing and selling of steel products
 
99.92
%
 
99.92
%
 
99.91
%
Ternium Internacional Costa Rica S.A.
 
Costa Rica
 
Manufacturing and selling of steel products
 
99.98
%
 
99.98
%
 
99.98
%
Ternium Colombia S.A.S. (formerly Ferrasa S.A.S.) (12)
 
Colombia
 
Manufacturing and selling of steel products
 
100.00
%
 
100.00
%
 
100.00
%
Ternium del Cauca S.A.S. (formerly Perfilamos del Cauca S.A.S.) (12)
 
Colombia
 
Manufacturing and selling of steel products
 
100.00
%
 
100.00
%
 
100.00
%
Ternium Siderúrgica de Caldas S.A.S. (formerly Siderúrgica de Caldas S.A.S.) (12)
 
Colombia
 
Manufacturing and selling of steel products
 
100.00
%
 
100.00
%
 
100.00
%
Tenigal S. de R.L. de C.V. (13)
 
Mexico
 
Manufacturing and selling of steel products
 
51.00
%
 
51.00
%
 
51.00
%
Ternium Internacional S.A. (14)
 
Uruguay
 
Holding and marketing of steel products
 
100.00
%
 
100.00
%
 
100.00
%
 
 
Country of
 
 
 
Percentage of ownership
at December 31,
Company
 
Organization
 
Main activity
 
2017
 
2016
 
2015
 
 
 
 
 
 
 
 
 
 
 
Ternium Treasury Services S.A. (14)
 
Uruguay
 
Financial Services
 
100.00
%
 
100.00
%
 
100.00
%
Ternium Internationaal B.V. (15)
 
Netherlands
 
Marketing of steel products
 
100.00
%
 
100.00
%
 
100.00
%
Ternium International Inc. (15)
 
Panama
 
Marketing of steel products
 
100.00
%
 
100.00
%
 
100.00
%
Ternium Procurement S.A. (16)
 
Uruguay
 
Procurement services
 
100.00
%
 
100.00
%
 
100.00
%
Technology & Engineering Services S.A. (16)
 
Uruguay
 
Engineering and other services
 
100.00
%
 
100.00
%
 
100.00
%
Ternium International USA Corporation (17)
 
USA
 
Marketing of steel products
 
100.00
%
 
100.00
%
 
100.00
%
Ternium Internacional de Colombia S.A.S. (18)
 
Colombia
 
Marketing of steel products
 
100.00
%
 
100.00
%
 
100.00
%
Ternium Ingeniería y Servicios de México S.A. de C.V.
 
Mexico
 
Engineering and other services
 
100.00
%
 
100.00
%
 
100.00
%
Soluciones Integrales de Gestión S.A. (19)
 
Argentina
 
Other services
 
100.00
%
 
100.00
%
 
100.00
%
Procesadora de Materiales Industriales S.A. (20)
 
Colombia
 
Scrap services company
 
—

 
—

 
100.00
%
Ferropak Servicios S.A. de C.V. (21)
 
Mexico
 
Services
 
—

 
—

 
88.72
%
Corporativo Grupo Imsa S.A. de C.V. (21)
 
Mexico
 
Services
 
—

 
—

 
88.72
%
Ternium International Ecuador S.A. (22)
 
Ecuador
 
Marketing of steel products
 
—

 
—

 
100.00
%
Ternium Staal B.V. (23)
 
Netherlands
 
Holding and marketing of steel products
 
100.00

 
—

 
—

Ternium Brasil Ltda. (23)
 
Brazil
 
Manufacturing and selling of steel products
 
100.00

 
—

 
—

Ecosteel Gestao de Efuentes Industriais S.A. (23)
 
Brazil
 
Other services
 
100.00

 
—

 
—

Ecosteel Gestao de Águas Industriais S.A. (23)
 
Brazil
 
Other services
 
100.00

 
—

 
—

Ternium del Atlántico S.A.S (24)
 
Colombia
 
Manufacturing and selling of steel products
 
100.00

 
—

 
—

(1) Indirectly through Ternium Investments S.à.r.l. Total voting rights held: 100.00%.
(2) During the fourth quarter of 2017, Siderar S.A.I.C. changed its business name to Ternium Argentina S.A. Indirectly through Ternium Internacional España S.L.U. Total voting rights held: 60.94%.
(3) Since the fourth quarter of 2017, indirectly through Ternium Argentina S.A. and Soluciones Integrales S.A Total voting rights held 100.00%. Before that, indirectly through Ternium Argentina S.A. and Ternium Internacional S.A.
(4) Since the fourth quarter 2017, indirectly through Ternium Argentina S.A. and Ternium Procurement S.A. Total voting rights held 100.00%. Before that indirectly through Ternium Argentina S.A. and Ternium Internacional S.A.
(5) Since the fourth quarter 2017, indirectly through Ternium Argentina S.A. and Ternium Internacional España S.L.U. Total voting rights held 100.00%. Before that indirectly through Ternium Argentina S.A., Ternium Internacional S.A. and Ternium Internacional España S.L.U.
(6) Indirectly through Ternium Mexico S.A. de C.V. Total voting rights held: 100.00%.
(7) This company dissolved as of December 11, 2017.
(8) Indirectly through Ternium Mexico S.A. de C.V. and Tenigal S. de R.L. de C.V. Total voting rights held: 100.00%.
(9) Indirectly through Ternium Internacional España S.L.U. Total voting rights held: 100.00%.
(10) Total voting rights held: 50.00%.
(11) Indirectly through Ternium Mexico S.A. de C.V. Total voting rights held: 74.50%.
(12) Indirectly through Ternium Internacional España S.L.U.. Total voting rights held: 100.00%. See note 2 (b).
(13) Indirectly through Ternium Internacional España S.L.U. Total voting rights held: 51.00%.
(14) Indirectly through Ternium Investments Switzerland AG. Total voting rights held: 100.00%.
(15) Since the third quarter 2017, indirectly through Ternium Investments S.à.r.l. Total voting rights held 100.00%. Before that, indirectly through Ternium Investments Switzerland AG.
(16) Since the third quarter of 2017, indirectly through Ternium Internacional España S.L.U. Total voting rights held 100.00%. Before that, indirectly through Ternium Investments Switzerland AG.
(17) Since the fourth quarter 2017, indirectly through Ternium Investments S.à.r.l. Total voting rights held: 100.00%. Before that, indirectly through Ternium Internacional S.A.
(18) Indirectly through Ternium Internacional S.A. Total voting rights held 100.00%.
(19) Since the third quarter of 2017, indirectly through Ternium Investments Sà.r.l and Ternium Internacional España S.L.U. Total voting rights held 100.00%. Before that indirectly throgh Ternium Investments S.à.r.l and Technology and Engineering Services S.A.
(20) This company was dissolved as of December 6, 2016.
(21) Merged with Hylsa S.A. de C.V. during the fourth quarter of 2016.
(22) This company was dissolved as of September 27, 2016.
(23) Indirectly through Ternium Investments S.à.r.l. Total voting right held: 100.00%.
(24) Indirectly through Ternium Internacional España S.L.U. Total voting rights held: 100.00%.