-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
Originator-Key-Asymmetric:
 MFgwCgYEVQgBAQICAf8DSgAwRwJAW2sNKK9AVtBzYZmr6aGjlWyK3XmZv3dTINen
 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 FsNeGEHI/vJL+g6K5vKCNg1HJWSNBwaOqDIl36Ge9dGgkSZG5fZSQn7tyALNZId5
 Ym62fHQc3ZCc5PImvEvB2A==

<SEC-DOCUMENT>0001104659-06-032961.txt : 20060510
<SEC-HEADER>0001104659-06-032961.hdr.sgml : 20060510
<ACCEPTANCE-DATETIME>20060510093730
ACCESSION NUMBER:		0001104659-06-032961
CONFORMED SUBMISSION TYPE:	10-Q
PUBLIC DOCUMENT COUNT:		7
CONFORMED PERIOD OF REPORT:	20060331
FILED AS OF DATE:		20060510
DATE AS OF CHANGE:		20060510

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:			1204

	FILING VALUES:
		FORM TYPE:		10-Q
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-21719
		FILM NUMBER:		06823579

	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
</SEC-HEADER>
<DOCUMENT>
<TYPE>10-Q
<SEQUENCE>1
<FILENAME>a06-11535_110q.htm
<DESCRIPTION>QUARTERLY REPORT PURSUANT TO SECTIONS 13 OR 15(D)
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-31.1
<SEQUENCE>2
<FILENAME>a06-11535_1ex31d1.htm
<DESCRIPTION>EX-31
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-31.2
<SEQUENCE>3
<FILENAME>a06-11535_1ex31d2.htm
<DESCRIPTION>EX-31
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-32.1
<SEQUENCE>4
<FILENAME>a06-11535_1ex32d1.htm
<DESCRIPTION>EX-32
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-32.2
<SEQUENCE>5
<FILENAME>a06-11535_1ex32d2.htm
<DESCRIPTION>EX-32
</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>7
<FILENAME>g115351bki001.gif
<DESCRIPTION>GRAPHIC
</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>8
<FILENAME>g115351bki002.gif
<DESCRIPTION>GRAPHIC
</DOCUMENT>
</SUBMISSION>