Washington, D.C. 20549 FORM 6-K Report of Foreign Private Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 SECURITIES AND EXCHANGE COMMISSION For the month of June, 2021 Commission File Number 1-14732 COMPANHIA SIDERÚRGICA NACIONAL (Exact name of registrant as specified in its charter) National Steel Company (Translation of Registrant's name into English) Av. Brigadeiro Faria Lima 3400, 20º andar São Paulo, SP, Brazil 04538-132 (Address of principal executive office) Indicate ...

Financial Data and Key Metrics Changes - The company reported a record EBITDA of BRL5.8 billion for Q1 2021, with a margin of 48%, reflecting strong cost control and profitability across segments [19][20] - The net debt/EBITDA ratio improved to 1.29x, with a target to reach below 1.0x in the near future [19][23] - Cash generation was strong at BRL3.5 billion, despite a slight drop due to dividend payouts [22] Business Line Data and Key Metrics Changes - The Steel segment achieved the best sales volume since 2016, with an EBITDA margin of 27% and expectations for double-digit growth in volumes sold for 2021 [26][27] - The Mining segment reported a record EBITDA of BRL3.7 billion, with a 47% increase in volumes compared to the previous year [29] - The Cement segment experienced a growth of 19%, with maximum production and sales levels reached, and plans for an IPO to fund further growth [30][31] Market Data and Key Metrics Changes - Domestic and international demand for steel remains strong, with significant price increases observed globally [8][10] - The company anticipates continued growth in the Brazilian market, projecting a 10% growth rate for 2021, which is higher than other industry forecasts [66] Company Strategy and Development Direction - The company is focused on deleveraging and aims to achieve an investment grade rating by the end of the year [19][53] - Plans for an IPO in the Cement business are underway, with a strategy to enhance market position through both organic growth and M&A opportunities [16][31] - The company is adapting its trade policy to better align with market conditions and improve pricing strategies [45][49] Management's Comments on Operating Environment and Future Outlook - Management expressed confidence in the second quarter being better than the first, driven by strong demand and improved production capabilities [15][58] - The company is closely monitoring international market dynamics, particularly regarding China's steel production and its impact on global supply [12][48] - There is a strong focus on sustainability and ESG initiatives, with significant progress reported in safety and environmental management [33][36] Other Important Information - The company has made strides in reducing accident frequency rates, achieving a 19% reduction compared to historical averages [33] - The company is actively working on diversifying its product offerings and enhancing its market presence through strategic initiatives [14][52] Q&A Session Summary Question: What new business opportunities is CSN considering? - Management highlighted the focus on infrastructure opportunities as the world recovers from COVID, with a strategic outlook on potential new business ventures [41] Question: How is CSN managing unprecedented price increases? - The company is successfully implementing price increases and adapting its pricing strategy to maintain margins, with a focus on distribution channels [42][44] Question: What are the growth plans for the Cement business? - The Cement segment is pursuing both organic growth and M&A opportunities, with several robust projects in the pipeline [62][63]

Companhia Siderúrgica Nacional (NYSE:SID) Q4 2020 Earnings Conference Call February 23, 2021 1:00 PM ET Company Participants Marcelo Cunha Ribeiro - Investor Relations Executive Officer Helena Guerra - Head-Sustainability, Health, Safety & Environmental Affairs Benjamin Steinbruch - President of Executive Board, Chairman & Chief Executive Officer Luis Fernando Barbosa Martinez - Executive Director Conference Call Participants Caio Ribeiro - Credit Suisse Daniel Sasson - Itau BBA Leonardo Correa - BTG Pactua ...

Companhia Siderurgica Nacional (NYSE:SID) Q3 2020 Results Conference Call October 16, 2020 10:00 AM ET Company Participants Marcelo Cunha Ribeiro - Investor Relations Executive Officer Benjamin Steinbruch - CEO and Board Chairman Luis Martinez - Executive Commercial Director Edvaldo Rabelo - Cement Business Director Conference Call Participants Thiago Augusto - Goldman Sachs Thiago Lofiego - Bradesco BBI Daniel Sasson - Itau BBA Caio Ribeiro - Credit Suisse Carlos de Alba - Morgan Stanley Alejandra Andrade ...

Companhia Siderurgica Nacional (NYSE:SID) Q2 2020 Earnings Conference Call July 29, 2020 10:00 AM ET Company Participants Marcelo Cunha Ribeiro - CFO and IRO Luis Martinez - Executive Commercial Director Conference Call Participants Thiago Lofiego - Bradesco BBI Daniel Sasson - Itau BBA Carlos de Alba - Morgan Stanley Thiago Ojea - Goldman Sachs Leonardo Correa - BTG Pactual Gabriela Joubert - Credit Suisse Operator Good afternoon and thank you for holding. At this time, we would like to welcome everyone to ...

Companhia Siderurgica Nacional (NYSE:SID) Q1 2020 Results Earnings Conference Call May 15, 2020 3:00 PM ET Company Participants Marcelo Cunha Ribeiro - Chief Financial Officer, Investor Relations Officer Benjamin Steinbruch - Chief Executive Officer, Chairman of the Board, Luis Fernando Barbosa Martinez - Executive Officer of Commercial and Logistic Conference Call Participants Daniel Sasson - Itau BBA Thiago Ojea - Goldman Sachs Gabriel Galvao - Credit Suisse Carlos de Alba - Morgan Stanley Operator Good a ...

Companhia Siderúrgica Nacional (NYSE:SID) Q4 2019 Earnings Conference Call March 5, 2020 9:00 AM ET Company Participants Marcelo Cunha Ribeiro - CFO and IR Officer Benjamin Steinbruch - President, Chairman and CEO Luis Fernando Barbosa Martinez - Executive Officer Pedro Gutemberg Quariguasi Netto - Executive Director Conference Call Participants Daniel Sasson - Itau Bank Leonardo Correa - BTG Pactual Thiago Ojea - Goldman Sachs Caio Ribeiro - Credit Suisse Thiago Lofiego - Bradesco BBI Carlos De Alba - Morg ...

Companhia Siderúrgica Nacional (NYSE:SID) Q3 2019 Earnings Conference Call October 24, 2019 10:00 AM ET Company Participants Marcelo Cunha Ribeiro - Chief Financial and Investor Relations Officer Benjamin Steinbruch - President, Chairman and Chief Executive Officer Luis Fernando Barbosa Martinez - Executive Officer Pedro Gutemberg Quariguasi Netto - Executive Director Conference Call Participants Carlos De Alba - Morgan Stanley Thiago Lofiego - Bradesco BBI Leonardo Correa - BTG Pactual Daniel Sasson - Itau ...

Companhia Siderúrgica Nacional (NYSE:SID) Q2 2019 Earnings Conference Call July 31, 2019 10:00 AM ET Company Participants Marcelo Cunha Ribeiro - Chief Financial & Investor Relation Officer Benjamin Steinbruch - President, Chairman & Chief Executive Officer Luis Martinez - Executive Officer Conference Call Participants Leonardo Correa - BTG Pactual Gustavo Allevato - Santander Bank Daniel Sasson - Itau BBA Carlos De Alba - Morgan Stanley Thiago Lofiego – Bradesco Caio Ribeiro - Credit Suisse Petr Grishchenk ...