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Cover
 12 Months Ended
Dec. 31, 2021
shares
Entity Addresses [Line Items]  
Document Type 20-F
Amendment Flag false
Document Registration Statement false
Document Annual Report true
Document Transition Report false
Document Shell Company Report false
Document Period End Date Dec. 31, 2021
Document Fiscal Period Focus FY
Document Fiscal Year Focus 2021
Current Fiscal Year End Date --12-31
Entity File Number 1-14732
Entity Registrant Name NATIONAL STEEL CO
Entity Central Index Key 0001049659
Entity Address, Country BR
Title of 12(b) Security Common Shares without Par Value
Trading Symbol SID
Security Exchange Name NYSE
Entity Well-known Seasoned Issuer Yes
Entity Voluntary Filers No
Entity Current Reporting Status Yes
Entity Interactive Data Current Yes
Entity Filer Category Large Accelerated Filer
Entity Emerging Growth Company false
Document Accounting Standard International Financial Reporting Standards
Entity Shell Company false
Entity Common Stock, Shares Outstanding 1,387,524,047
Contact Personnel Fax Number +55 11 3049-7212
ICFR Auditor Attestation Flag true
Auditor Name Grant Thornton Auditores Independentes
Auditor Firm Id 5270
Auditor Location São Paulo
Business Contact [Member]  
Entity Addresses [Line Items]  
Entity Address, Address Line One Av. Brigadeiro Faria Lima, 3400 – 20th floor
Entity Address, City or Town São Paulo
Entity Address, Postal Zip Code 04538-132
City Area Code +55 11
Local Phone Number 3049-7454
Contact Personnel Name Marcelo Cunha Ribeiro
Contact Personnel Email Address marcelo.ribeiro@csn.com.br