    <SEC-DOCUMENT>0001292814-19-003990-index.html : 20191126
    <SEC-HEADER>0001292814-19-003990.hdr.sgml : 20191126
    <ACCEPTANCE-DATETIME>20191126154514
    ACCESSION NUMBER:		0001292814-19-003990
    CONFORMED SUBMISSION TYPE:	6-K
    PUBLIC DOCUMENT COUNT:		12
    CONFORMED PERIOD OF REPORT:	20190930
    FILED AS OF DATE:		20191126
    DATE AS OF CHANGE:		20191126

    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:		191250549

    	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>siditr3q19_6k.htm
    <DESCRIPTION>QUARTERLY FINANCIAL INFORMATION - SEPTEMBER 30, 2019 - CIA SIDERURGICA NACIONAL
    <TEXT>
    Document 1 - file: siditr3q19_6k.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>2
    <FILENAME>fp21a.jpg
    <TEXT>
    Document 2 - file: fp21a.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>3
    <FILENAME>fp21b.jpg
    <TEXT>
    Document 3 - file: fp21b.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>4
    <FILENAME>fp22a.jpg
    <TEXT>
    Document 4 - file: fp22a.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>5
    <FILENAME>fp24a.jpg
    <TEXT>
    Document 5 - file: fp24a.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>6
    <FILENAME>fp26a.jpg
    <TEXT>
    Document 6 - file: fp26a.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>7
    <FILENAME>fp26b.jpg
    <TEXT>
    Document 7 - file: fp26b.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>8
    <FILENAME>fp26c.jpg
    <TEXT>
    Document 8 - file: fp26c.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>9
    <FILENAME>fp27a.jpg
    <TEXT>
    Document 9 - file: fp27a.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>10
    <FILENAME>fp27b.jpg
    <TEXT>
    Document 10 - file: fp27b.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>11
    <FILENAME>fp28a.jpg
    <TEXT>
    Document 11 - file: fp28a.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>12
    <FILENAME>logo01.jpg
    <TEXT>
    Document 12 - file: logo01.jpg

    </DOCUMENT>
    </SEC-DOCUMENT>