    <SEC-DOCUMENT>0001292814-25-003083-index.html : 20250815
    <SEC-HEADER>0001292814-25-003083.hdr.sgml : 20250815
    <ACCEPTANCE-DATETIME>20250814195111
    ACCESSION NUMBER:		0001292814-25-003083
    CONFORMED SUBMISSION TYPE:	6-K
    PUBLIC DOCUMENT COUNT:		6
    CONFORMED PERIOD OF REPORT:	20250630
    FILED AS OF DATE:		20250815
    DATE AS OF CHANGE:		20250814

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			NATIONAL STEEL CO
    		CENTRAL INDEX KEY:			0001049659
    		STANDARD INDUSTRIAL CLASSIFICATION:	STEEL WORKS, BLAST FURNACES & ROLLING & FINISHING MILLS [3310]
    		ORGANIZATION NAME:           	04 Manufacturing
    		EIN:				000000000
    		STATE OF INCORPORATION:			D5
    		FISCAL YEAR END:			1231

    	FILING VALUES:
    		FORM TYPE:		6-K
    		SEC ACT:		1934 Act
    		SEC FILE NUMBER:	001-14732
    		FILM NUMBER:		251221966

    	BUSINESS ADDRESS:
    		ADDRESS IS A NON US LOCATION: 	YES
    		STREET 1:		BRIGADEIRO FARIA LIMA AVENUE, 3400
    		STREET 2:		ITAIM BIBI - 19/20 FLOOR
    		CITY:			SAO PAULO
    		NON US STATE TERRITORY:  	SAO PAULO
    		PROVINCE COUNTRY:   	D5
    		ZIP:			04538-132
    		BUSINESS PHONE:		55 11 3049-7585

    	MAIL ADDRESS:
    		ADDRESS IS A NON US LOCATION: 	YES
    		STREET 1:		BRIGADEIRO FARIA LIMA AVENUE, 3400
    		STREET 2:		ITAIM BIBI - 19/20 FLOOR
    		CITY:			SAO PAULO
    		NON US STATE TERRITORY:  	SAO PAULO
    		PROVINCE COUNTRY:   	D5
    		ZIP:			04538-132
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>6-K
    <SEQUENCE>1
    <FILENAME>siditr2q25_6k.htm
    <DESCRIPTION>6-K
    <TEXT>
    Document 1 - file: siditr2q25_6k.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>2
    <FILENAME>siditr2q256k_001.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 2 - file: siditr2q256k_001.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>3
    <FILENAME>siditr2q256k_002.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 3 - file: siditr2q256k_002.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>4
    <FILENAME>siditr2q256k_003.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 4 - file: siditr2q256k_003.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>5
    <FILENAME>siditr2q256k_005.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 5 - file: siditr2q256k_005.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>6
    <FILENAME>siditr2q256k_004.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 6 - file: siditr2q256k_004.jpg

    </DOCUMENT>
    </SEC-DOCUMENT>