    <SEC-DOCUMENT>0001292814-18-003771-index.html : 20181129
    <SEC-HEADER>0001292814-18-003771.hdr.sgml : 20181129
    <ACCEPTANCE-DATETIME>20181129150949
    ACCESSION NUMBER:		0001292814-18-003771
    CONFORMED SUBMISSION TYPE:	6-K
    PUBLIC DOCUMENT COUNT:		12
    CONFORMED PERIOD OF REPORT:	20180930
    FILED AS OF DATE:		20181129
    DATE AS OF CHANGE:		20181129

    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:		6-K
    		SEC ACT:		1934 Act
    		SEC FILE NUMBER:	001-14732
    		FILM NUMBER:		181208268

    	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>6-K
    <SEQUENCE>1
    <FILENAME>siditr3q18_6k.htm
    <DESCRIPTION>QUARTERLY FINANCIAL INFORMATION - SEPTEMBER 30, 2018 - CIA SIDERURGICA NACIONAL
    <TEXT>
    Document 1 - file: siditr3q18_6k.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>2
    <FILENAME>f001.jpg
    <TEXT>
    Document 2 - file: f001.jpg

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    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>3
    <FILENAME>f002.jpg
    <TEXT>
    Document 3 - file: f002.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>4
    <FILENAME>f003.jpg
    <TEXT>
    Document 4 - file: f003.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>5
    <FILENAME>f004a.jpg
    <TEXT>
    Document 5 - file: f004a.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>6
    <FILENAME>f005.jpg
    <TEXT>
    Document 6 - file: f005.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>7
    <FILENAME>f006.jpg
    <TEXT>
    Document 7 - file: f006.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>8
    <FILENAME>f007.jpg
    <TEXT>
    Document 8 - file: f007.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>9
    <FILENAME>f008.jpg
    <TEXT>
    Document 9 - file: f008.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>10
    <FILENAME>f009.jpg
    <TEXT>
    Document 10 - file: f009.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>11
    <FILENAME>f010.jpg
    <TEXT>
    Document 11 - file: f010.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>12
    <FILENAME>f011.jpg
    <TEXT>
    Document 12 - file: f011.jpg

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