COMPANHIA SIDERÚRGICA NACIONAL

Publicly-Held Company

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

State Registry (NIRE) 35-3.0039609.0

MATERIAL FACT

Companhia Siderúrgica Nacional (BOVESPA: CSNA3; NYSE: in line with the Material Facts disclosed on May 15, August 15 and October 30, 2017, hereby announces to its shareholders and to the market in general that the Company has already filed its Quarterly Information (ITR), reviewed by the independent auditors, on the first, second and third quarters of 2017.

São Paulo, December 26, 2017.

David Moise Salama Investor Relations Officer

CSN - Companhia Siderúrgica Nacional published this content on 26 December 2017 and is solely responsible for the information contained herein.
Distributed by Public, unedited and unaltered, on 26 December 2017 10:44:05 UTC.

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