(Free Translation: For reference only - Original in Portuguese)

Usiminas Belo Horizonte Rua Prof. José Vieira de Mendonça, 3011 31310-260 Belo Horizonte, MG

P 55 31 3499-8000

F 55 31 3499-8899

www.usiminas.com

USINAS SIDERÚRGICAS DE MINAS GERAIS S.A. - USIMINAS

CNPJ/MF: 60.894.730/0001-05 NIRE: 313.000.1360-0

Publicly-Held Company

NOTICE TO THE MARKET Usinas Siderúrgicas de Minas Gerais S.A. - USIMINAS ("Usiminas" or "Company") hereby informs that, on this date, executed with Thyssenkrupp CSA Siderúrgica do Atlântico S.A. ("CSA") a Memorandum of Understanding ("MOU") which establishes the commercial basis for the purchase of CSA steel slabs by Usiminas, for the supply of Cubatão Plant. The MOU does not require exclusivity and will be valid for 60 (sixty) months, as of 06.30.2017.

In view of the recent acquisition of CSA by the T / T Group - member of the Company's controlling group - which is still pending of approval by the Brazilian Antitrust Authorities (Conselho Administrativo de Defesa Econômica - CADE), the MOU provides that its effects will be suspended as of such approval and until its terms are confirmed by the Board of Directors of Usiminas, since the Company and CSA will be considered related parties, pursuant to paragraph 1 of article 13 of the Company's Bylaws.

Belo Horizonte, June 22nd, 2017

Ronald Seckelmann

Finances and Investor Relations Vice-President Officer

USIMINAS - Usinas Siderúrgicas de Minas Gerais SA published this content on 22 June 2017 and is solely responsible for the information contained herein.
Distributed by Public, unedited and unaltered, on 17 July 2017 09:02:16 UTC.

Original documenthttp://v4-usiminas.infoinvest.com.br//enu/5506/2017_06_22_Notice to Market MOU.pdf

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