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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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<SEC-DOCUMENT>0001104659-08-030780.txt : 20080507
<SEC-HEADER>0001104659-08-030780.hdr.sgml : 20080507
<ACCEPTANCE-DATETIME>20080507163610
ACCESSION NUMBER:		0001104659-08-030780
CONFORMED SUBMISSION TYPE:	10-Q
PUBLIC DOCUMENT COUNT:		13
CONFORMED PERIOD OF REPORT:	20080331
FILED AS OF DATE:		20080507
DATE AS OF CHANGE:		20080507

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			STEEL DYNAMICS INC
		CENTRAL INDEX KEY:			0001022671
		STANDARD INDUSTRIAL CLASSIFICATION:	STEEL WORKS, BLAST FURNACES  ROLLING MILLS (COKE OVENS) [3312]
		IRS NUMBER:				351929476
		STATE OF INCORPORATION:			IN
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		10-Q
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-21719
		FILM NUMBER:		08810434

	BUSINESS ADDRESS:	
		STREET 1:		6714 POINTE INVERNESS WAY
		STREET 2:		SUITE 200
		CITY:			FORT WAYNE
		STATE:			IN
		ZIP:			46804
		BUSINESS PHONE:		2604593553

	MAIL ADDRESS:	
		STREET 1:		6714 POINTE INVERNESS WAY
		STREET 2:		SUITE 200
		CITY:			FORT WAYNE
		STATE:			IN
		ZIP:			46804
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<DOCUMENT>
<TYPE>10-Q
<SEQUENCE>1
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<DESCRIPTION>10-Q
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<DOCUMENT>
<TYPE>EX-3.1B
<SEQUENCE>2
<FILENAME>a08-11528_1ex3d1b.htm
<DESCRIPTION>EX-3.1B
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<TYPE>EX-3.1C
<SEQUENCE>3
<FILENAME>a08-11528_1ex3d1c.htm
<DESCRIPTION>EX-3.1C
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<DOCUMENT>
<TYPE>EX-31.1
<SEQUENCE>4
<FILENAME>a08-11528_1ex31d1.htm
<DESCRIPTION>EX-31.1
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<DOCUMENT>
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<SEQUENCE>5
<FILENAME>a08-11528_1ex31d2.htm
<DESCRIPTION>EX-31.2
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<DOCUMENT>
<TYPE>EX-32.1
<SEQUENCE>6
<FILENAME>a08-11528_1ex32d1.htm
<DESCRIPTION>EX-32.1
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<SEQUENCE>7
<FILENAME>a08-11528_1ex32d2.htm
<DESCRIPTION>EX-32.2
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<SEQUENCE>8
<FILENAME>g115281kgi001.jpg
<DESCRIPTION>GRAPHIC
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<SEQUENCE>10
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<DESCRIPTION>GRAPHIC
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<SEQUENCE>11
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