    <SEC-DOCUMENT>0001292814-19-001150-index.html : 20190405
    <SEC-HEADER>0001292814-19-001150.hdr.sgml : 20190405
    <ACCEPTANCE-DATETIME>20190404214951
    ACCESSION NUMBER:		0001292814-19-001150
    CONFORMED SUBMISSION TYPE:	20-F
    PUBLIC DOCUMENT COUNT:		14
    CONFORMED PERIOD OF REPORT:	20181231
    FILED AS OF DATE:		20190405
    DATE AS OF CHANGE:		20190404

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			NATIONAL STEEL CO
    		CENTRAL INDEX KEY:			0001049659
    		STANDARD INDUSTRIAL CLASSIFICATION:	STEEL WORKS, BLAST FURNACES & ROLLING & FINISHING MILLS [3310]
    		IRS NUMBER:				000000000
    		FISCAL YEAR END:			1231

    	FILING VALUES:
    		FORM TYPE:		20-F
    		SEC ACT:		1934 Act
    		SEC FILE NUMBER:	001-14732
    		FILM NUMBER:		19733369

    	BUSINESS ADDRESS:
    		STREET 1:		RUA LAURO MULLER
    		STREET 2:		116 36 ANDAR
    		CITY:			RIO DE JANEIRO RJ BR
    		STATE:			D5
    		ZIP:			00000
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>20-F
    <SEQUENCE>1
    <FILENAME>sidform20f_2018.htm
    <DESCRIPTION>FORM 20-F
    <TEXT>
    Document 1 - file: sidform20f_2018.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-8.1
    <SEQUENCE>2
    <FILENAME>exhibit8_1.htm
    <DESCRIPTION>EXHIBIT 8.1
    <TEXT>
    Document 2 - file: exhibit8_1.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-12.1
    <SEQUENCE>3
    <FILENAME>exhibit12_1.htm
    <DESCRIPTION>EXHIBIT 12.1
    <TEXT>
    Document 3 - file: exhibit12_1.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-12.2
    <SEQUENCE>4
    <FILENAME>exhibit12_2.htm
    <DESCRIPTION>EXHIBIT 12.2
    <TEXT>
    Document 4 - file: exhibit12_2.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-13.1
    <SEQUENCE>5
    <FILENAME>exhibit13_1.htm
    <DESCRIPTION>EXHIBIT 13.1
    <TEXT>
    Document 5 - file: exhibit13_1.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-13.2
    <SEQUENCE>6
    <FILENAME>exhibit13_2.htm
    <DESCRIPTION>EXHIBIT 13.2
    <TEXT>
    Document 6 - file: exhibit13_2.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>7
    <FILENAME>fp38a.jpg
    <TEXT>
    Document 7 - file: fp38a.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>8
    <FILENAME>fp67a.jpg
    <TEXT>
    Document 8 - file: fp67a.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>9
    <FILENAME>logo01.jpg
    <TEXT>
    Document 9 - file: logo01.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>10
    <FILENAME>graphpag88.gif
    <TEXT>
    Document 10 - file: graphpag88.gif

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>11
    <FILENAME>tabpa126.gif
    <TEXT>
    Document 11 - file: tabpa126.gif

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    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>12
    <FILENAME>tabpag75.gif
    <TEXT>
    Document 12 - file: tabpag75.gif

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    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>13
    <FILENAME>tabpag79.gif
    <TEXT>
    Document 13 - file: tabpag79.gif

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    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>14
    <FILENAME>tabpag81.gif
    <TEXT>
    Document 14 - file: tabpag81.gif

    </DOCUMENT>
    </SEC-DOCUMENT>