Indicate by check mark whether the registrant by furnishing the information contained in this Form is also thereby furnishing the information to the Commission pursuant to Rule 12g3-2(b) under the Securities Exchange Act of 1934.  

COMPANHIA SIDERÚRGICA NACIONAL

Publicly-Held Company

Corporate Taxpayer’s ID (CNPJ MF): 33.042.730/0001-04

Company Registry (NIRE): 35-3.0039609.0

NOTICE TO THE MARKET

COMPANHIA SIDERÚRGICA NACIONAL hereby informs, in compliance with the provisions of art. 12 of CVM Instruction 358/2002, as amended, which received, on this date, a communication from CFL Participações S.A., as follows:

"CFL PARTICIPAÇÕES SA, a private legal entity incorporated in the form of a corporate corporation of the anonymous, private type, whose corporate acts are filed at the Commercial Registry of the State of São Paulo under the Company Registration Number 35-3.0035483-4, headquartered in the city of São Paulo, State of São Paulo, at Rua General Jardim, 808, 13º andar, CEP 01223-010 and registered in the National Registry of Legal Entity, of the Ministry of Finance under 60.078.045/0001-00, hereby present as a shareholder of Vicunha Steel SA and Vicunha Aços SA, which in turn is a direct controller of Companhia Siderúrgica Nacional (hereinafter referred to as "CFL"), hereby communicates the following:

1. Ms. Clarice Steinbruch, a Brazilian citizen, legally separated, administrator, bearer of the Identity Card of General Registry ("RG") 7.526.365-8/SSP-SP, enrolled in the Physical Persons Registry of the Ministry of Finance ("CPF / MF") under n. 032.473.948-69, resident and domiciled in the city of São Paulo, with business address in the city of São Paulo, State of São Paulo, at Rua General Jardim, 808, 13º andar, CEP 01223-010, CFL shareholder, by donation, part of their participation in the capital of CFL for their children, being:

(i) 109,279,849 (one hundred and nine million, two hundred and seventy-nine thousand, eight hundred and forty-nine) common, nominative shares with no par value issued by CFL for its daughter Mônica Vidiz, Brazilian, married, psychologist, bearer of the identity card of RG n. 27.965.627-0/SSP-SP, enrolled with the CPF / MF under n. 228.020.728-11, resident and domiciled in the city of São Paulo, with a business address in the city of São Paulo, State of São Paulo, at Rua General Jardim, 808, 13º andar, CEP 01223-010 ("Ações Mônica"); and

(ii) 109,279,848 (one hundred and nine million, two hundred and seventy-nine thousand, eight hundred and forty-eight) common, nominative shares with no par value issued by CFL for its son Paulo Vidiz, Brazilian, single, publicist, bearer of the identity card of RG n. 22.221.435-1/SSP-SP, enrolled with the CPF / MF under n. 228.020.718-40, resident and domiciled in the city of São Paulo, with business address in the city of São Paulo, State of São Paulo, at Rua General Jardim, 808, 13º andar, CEP 01223-010 ("Paulo Shares"),

2. In addition, Clarice Steinbruch was granted a life-time usufruct over the economic rights related to the Monica Shares and the Paulo Shares.

3. Notwithstanding the aforementioned transactions, Clarice Steinbruch remains a shareholder of CFL, holder of 109,279,848 (one hundred and nine million, two hundred and seventy-nine thousand, eight hundred and forty-eight) common, nominative shares with no par value of issuance of CFL.

4. In view of the information communicated herein, the capital stock of CFL is now composed as follows:

(*) with a lifetime usufruct of economic rights in favor of Clarice Steinbruch

Being what we had to communicate, we ask that you take all steps arising from the information transmitted herein and remain available for any clarifications that may be necessary."

São Paulo, Sep 3^rd 2018.

Marcelo Cunha Ribeiro

Chief Financial and Investor Relations Officer