COMPANHIA SIDERÚRGICA NACIONAL

Publicly-held Company

Corporate Taxpayer's ID (CNPJ/MF) No. 33.042.730/0001-04

State Registry (NIRE) No.: 35-3.0039609.0

MATERIAL FACT

Companhia Siderúrgica Nacional ("Company"), in addition to the Material Fact published on December 8, 2017, hereby informs its shareholders and the market in general that the validity period of the Environmental Authorization - AA No. IN042958, which maintains the full operation of the Presidente Vargas plant (UPV), located in Volta Redonda/RJ, was extended for 90 days as of this date, in accordance with CECA/CFL Resolution No. 6,189, of June 19, 2018, the entirety of which was published in the Official Gazette of the State of Rio de Janeiro of the present date, page 13.

The Company continues to negotiate with the competent authorities of the State of Rio de Janeiro for a final consensual solution of environmental issues at the UPV and will keep its shareholders and the market in general informed on the progress of this matter.

São Paulo, June 20, 2018.

Marcelo Cunha Ribeiro

Chief Financial and Investor Relations Officer

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CSN - Companhia Siderúrgica Nacional published this content on 20 June 2018 and is solely responsible for the information contained herein. Distributed by Public, unedited and unaltered, on 20 June 2018 20:42:02 UTC