TX Ternium SA

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

TERNIUM S.A.

Name: Pablo Brizzio

Title: Chief Financial Officer

Dated: September 7, 2017

Sebastián Martí

Ternium - Investor Relations

+1 (866) 890 0443

+54 (11) 4018 8389

www.ternium.com

Ternium completes acquisition of CSA Siderúrgica do Atlântico

Luxembourg, September 7, 2017 – Ternium S.A. (NYSE: TX) announced today that it has completed its previously announced acquisition of a 100% ownership interest in thyssenkrupp Slab International B.V. (“tkSI”) and its wholly-owned subsidiary CSA Siderúrgica do Atlântico Ltda. (“CSA”) from thyssenkrupp AG (“tkAG”). In addition, tkAG assigned to Ternium a 2.0 million tons per year agreement to supply slabs from CSA’s facility in Brazil to thyssenkrupp’s former Calvert re-rolling facility in Alabama, United States.

“This acquisition brings another state-of-the-art facility into Ternium’s industrial system, along with CSA’s highly-skilled personnel and know-how, thereby enhancing our differentiation and value-added capabilities in the steel production supply chain,” said Daniel Novegil, CEO of Ternium. “Upon integration, Ternium customers will not only benefit from our expanded high-end steel slabs capacity, but also see the results of an enhanced product development and supply chain management effort that will increase our high-end steel specialization in Mexico and Argentina. We move forward as a strengthened organization across our strategic industrial sectors in Latin America.”

Ternium disbursed EUR1.4 billion, on a cash-free, debt-free basis, for the acquisition of both the tkSI shares and the slab supply agreement. Prior to the closing of the transaction, and following certain cash contributions by tkAG through tkSI, CSA repaid in full its EUR0.3 billion financial debt with BNDES. To finance its acquisition, Ternium entered into a five-year syndicated term loan facility in a principal amount of USD1.5 billion.

Ternium will integrate CSA into its industrial and supply-chain systems. As part of this process, CSA has changed its corporate name to Ternium Brasil Ltda. (“Ternium Brasil”), and Marcelo Chara, formerly Industrial Director of Ternium’s operations in Argentina, has been named Chief Executive Officer ( Diretor-Presidente ) of Ternium Brasil. In addition, tkSI has changed its corporate name to Ternium Staal B.V. Ternium will consolidate Ternium Staal B.V.’s balance sheet and results of operations in its consolidated financial statements beginning in September 2017.

Forward Looking Statements

Some of the statements contained in this press release are “forward-looking statements”. Forward-looking statements are based on management’s current views and assumptions and involve known and unknown risks that could cause actual results, performance or events to differ materially from those expressed or implied by those statements. These risks include but are not limited to risks arising from uncertainties as to gross domestic product, related market demand, global production capacity, tariffs, cyclicality in the industries that purchase steel products and other factors beyond Ternium’s control.

About Ternium

Ternium is Latin America’s leading flat steel producer, with operating facilities in Mexico, Brazil, Argentina, Colombia, the southern United States and Central America. The company offers a broad range of high value-added steel products for customers active in the automotive, home appliances, construction, capital goods, container, food and energy industries through its manufacturing and service center network, and advanced customer integration systems. More information about Ternium is available at www.ternium.com.