    <SEC-DOCUMENT>0001292814-18-000525-index.html : 20180301
    <SEC-HEADER>0001292814-18-000525.hdr.sgml : 20180301
    <ACCEPTANCE-DATETIME>20180301073548
    ACCESSION NUMBER:		0001292814-18-000525
    CONFORMED SUBMISSION TYPE:	6-K
    PUBLIC DOCUMENT COUNT:		13
    CONFORMED PERIOD OF REPORT:	20180331
    FILED AS OF DATE:		20180301
    DATE AS OF CHANGE:		20180301

    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:		18654715

    	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>siditr1q17_6k.htm
    <DESCRIPTION>6-K
    <TEXT>
    Document 1 - file: siditr1q17_6k.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>2
    <FILENAME>img004.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 2 - file: img004.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>3
    <FILENAME>siditr1q17_6kfreetranslx22x1.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 3 - file: siditr1q17_6kfreetranslx22x1.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>4
    <FILENAME>siditr1q17_6kfreetranslx23x1.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 4 - file: siditr1q17_6kfreetranslx23x1.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>5
    <FILENAME>siditr1q17_6kfreetranslx25x1.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 5 - file: siditr1q17_6kfreetranslx25x1.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>6
    <FILENAME>siditr1q17_6kfreetranslx26x1.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 6 - file: siditr1q17_6kfreetranslx26x1.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>7
    <FILENAME>x18020613583701.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 7 - file: x18020613583701.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>8
    <FILENAME>x18021611571006.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 8 - file: x18021611571006.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>9
    <FILENAME>graphnew26.gif
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 9 - file: graphnew26.gif

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>10
    <FILENAME>imagem125.gif
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 10 - file: imagem125.gif

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>11
    <FILENAME>imagem126.gif
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 11 - file: imagem126.gif

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>12
    <FILENAME>img130.gif
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 12 - file: img130.gif

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>13
    <FILENAME>logo2.gif
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 13 - file: logo2.gif

    </DOCUMENT>
    </SEC-DOCUMENT>