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 (BOVESPA: CSNA3; NYSE: SID) ("CSN" or "Company"), pursuant to Article 157, Paragraph 4, of Law 6404/76, as amended and to the Instruction of the Securities and Exchange Commission ("CVM") No. 358/02, as amended, announces to its shareholders and to the market in general that, exceptionally, it will not make available the Quarterly Statement for the second quarter of 2017 within the term established by CVM Instruction No. 480/09, given that the Company is still working with its external auditors to conclude the review of the Financial Statements for the fiscal year ended on December 31, 2015, as well as to close the Financial Statements for the fiscal year ended on December 31, 2016, which affect the opening balances of the 2017 financial statements, as already reported in the Material Facts disclosed on March 27, 2017 and May 15, 2017, as well as in the Notice to the Market disclosed on May 24, 2017.

The Company is sparing no effort to disclose its financial statements and quarterly information as soon as possible. Immediately after establishing the date in which the work will be completed, the market will be timely informed.

São Paulo, August 15, 2017.

David Moise Salama Investor Relations Executive Officer

CSN - Companhia Siderúrgica Nacional published this content on 15 August 2017 and is solely responsible for the information contained herein.
Distributed by Public, unedited and unaltered, on 15 August 2017 21:51:04 UTC.

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