<SUBMISSION>
<ACCESSION-NUMBER>0001104659-07-054188
<TYPE>8-K
<PUBLIC-DOCUMENT-COUNT>3
<PERIOD>20070716
<ITEMS>8.01
<ITEMS>9.01
<FILING-DATE>20070716
<DATE-OF-FILING-DATE-CHANGE>20070716
<FILER>
<COMPANY-DATA>
<CONFORMED-NAME>STEEL DYNAMICS INC
<CIK>0001022671
<ASSIGNED-SIC>3312
<IRS-NUMBER>351929476
<STATE-OF-INCORPORATION>IN
<FISCAL-YEAR-END>1231
</COMPANY-DATA>
<FILING-VALUES>
<FORM-TYPE>8-K
<ACT>34
<FILE-NUMBER>000-21719
<FILM-NUMBER>07982239
</FILING-VALUES>
<BUSINESS-ADDRESS>
<STREET1>6714 POINTE INVERNESS WAY
<STREET2>SUITE 200
<CITY>FORT WAYNE
<STATE>IN
<ZIP>46804
<PHONE>2604593553
</BUSINESS-ADDRESS>
<MAIL-ADDRESS>
<STREET1>6714 POINTE INVERNESS WAY
<STREET2>SUITE 200
<CITY>FORT WAYNE
<STATE>IN
<ZIP>46804
</MAIL-ADDRESS>
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<TYPE>8-K
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<head>






</head>

<body lang="EN-US">

<div style="font-family:Times New Roman;">
 <div style="border:none;border-top:double windowtext 6.0pt;padding:0in 0in 0in 0in;"> <p style="border:none;margin:0in 0in .0001pt;padding:0in;"><a name="scotch"></a><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p> </div>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">&nbsp;</font></b></p>

<p align="center" style="font-size:10.0pt;margin:0in 0in 12.0pt;text-align:center;"><b><font size="5" face="Times New Roman" style="font-size:18.0pt;font-weight:bold;">SECURITIES
AND EXCHANGE COMMISSION</font></b><br>
<b>WASHINGTON, DC&#160; 20549</b></p>

<div style="line-height:9.0pt;margin:0in 0in 14.0pt;page-break-after:avoid;text-align:center;"><hr size="1" width="160" noshade color="black" align="center" style="width:120.0pt;"></div>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="5" face="Times New Roman" style="font-size:18.0pt;font-weight:bold;">FORM 8-K</font></b></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="5" face="Times New Roman" style="font-size:18.0pt;font-weight:bold;">&nbsp;</font></b></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="3" face="Times New Roman" style="font-size:12.0pt;font-weight:bold;">CURRENT REPORT</font></b></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="3" face="Times New Roman" style="font-size:12.0pt;font-weight:bold;">&nbsp;</font></b></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="3" face="Times New Roman" style="font-size:12.0pt;font-weight:bold;">Pursuant to Section 13 or 15(d)
of the Securities Exchange Act of 1934</font></b></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="3" face="Times New Roman" style="font-size:12.0pt;font-weight:bold;">&nbsp;</font></b></p>

<p align="center" style="margin:0in 0in 12.0pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Date of Report
(date of earliest event reported):&nbsp;&nbsp;July 16, 2007 (July 16, 2007)</font></p>

<p align="center" style="margin:0in 0in 12.0pt;text-align:center;"><b><u><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">STEEL DYNAMICS, INC.</font></u></b></p>

<p align="center" style="margin:0in 0in 12.0pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(Exact name of
registrant as specified in its charter)</font></p>

<div align="center">

<table border="0" cellspacing="0" cellpadding="0" width="100%" style="border-collapse:collapse;width:100.0%;">
 <tr>
  <td width="31%" valign="top" style="padding:0in .7pt 0in .7pt;width:31.74%;">
  <p align="center" style="font-size:10.0pt;margin:0in 0in .0001pt;text-align:center;"><!-- SET mrlNoTableShading --><b>Indiana</b></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0in .7pt 0in .7pt;width:2.38%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
  <td width="31%" valign="top" style="padding:0in .7pt 0in .7pt;width:31.74%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">0-21719</font></b></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0in .7pt 0in .7pt;width:2.38%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
  <td width="31%" valign="top" style="padding:0in .7pt 0in .7pt;width:31.74%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">35-1929476</font></b></p>
  </td>
 </tr>
 <tr>
  <td width="31%" valign="top" style="padding:0in .7pt 0in .7pt;width:31.74%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(State or other
  jurisdiction<br> &nbsp;of incorporation)</font></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0in .7pt 0in .7pt;width:2.38%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="31%" valign="top" style="padding:0in .7pt 0in .7pt;width:31.74%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(Commission File
  Number)</font></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0in .7pt 0in .7pt;width:2.38%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="31%" valign="top" style="padding:0in .7pt 0in .7pt;width:31.74%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(IRS Employer<br>
  Identification No.)</font></p>
  </td>
 </tr>
</table>

</div>

<p align="center" style="margin:0in 0in 12.0pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p align="center" style="font-size:10.0pt;margin:0in 0in 12.0pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">6714
Pointe Inverness Way, Suite 200, Fort Wayne, Indiana 46804<br>
</font></b>(Address of principal executive offices) (Zip Code)</p>

<p align="center" style="margin:0in 0in 6.0pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Registrant&#146;s
telephone number, including area code: 260-459-3553<br><br></font></b></p>

<p align="center" style="font-size:10.0pt;margin:0in 0in 12.0pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Not
Applicable</font></b><br>
(Former name or former address, if changed since last report)</p>

<p style="margin:0in 0in 12.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Check the appropriate box
below if the Form 8-K filing is intended to simultaneously satisfy the filing
obligation of the registrant under any of the following provisions:</font></p>

<p style="font-size:10.0pt;margin:0in 0in 12.0pt 20.0pt;text-indent:-20.0pt;"><font size="2" face="Wingdings" style="font-size:10.0pt;">o</font><font size="1" style="font-size:3.0pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font>Written
communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)</p>

<p style="font-size:10.0pt;margin:0in 0in 12.0pt 20.0pt;text-indent:-20.0pt;"><font size="2" face="Wingdings" style="font-size:10.0pt;">o</font><font size="1" style="font-size:3.0pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font>Soliciting material
pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)</p>

<p style="font-size:10.0pt;margin:0in 0in 12.0pt 20.0pt;text-indent:-20.0pt;"><font size="2" face="Wingdings" style="font-size:10.0pt;">o</font><font size="1" style="font-size:3.0pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font>Pre-commencement
communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR
240.14d-2(b))</p>

<p style="font-size:10.0pt;margin:0in 0in 12.0pt 20.0pt;text-indent:-20.0pt;"><font size="2" face="Wingdings" style="font-size:10.0pt;">o</font><font size="1" style="font-size:3.0pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font>Pre-commencement
communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR
240.13e-4(c))</p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>


 <div style="border:none;border-bottom:double windowtext 6.0pt;padding:0in 0in 0in 0in;"> <p style="border:none;margin:0in 0in .0001pt;padding:0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p> </div>
</div><br><hr size="3" width="100%" noshade color="#010101" align="center">

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<div>


<p style="margin:0in 0in 12.0pt;page-break-after:avoid;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Item
8.01.&#160; Other Events</font></b></p>

<p style="margin:0in 0in 12.0pt 25.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">On July 16, 2007, Steel
Dynamics, Inc. issued a press release entitled &#147;Steel Dynamics Ships First
Order of Welded Rail.&#148;&#160; The full text of
the press release is furnished herewith and attached hereto as Exhibit 99.1.</font></p>

<p style="margin:0in 0in 12.0pt;page-break-after:avoid;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Item
9.01.&#160; Financial Statements and Exhibits</font></b></p>

<p style="margin:0in 0in 12.0pt;page-break-after:avoid;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">( c )&nbsp;&nbsp;&nbsp;&nbsp;Exhibits.</font></p>

<div align="center" style="font-family:Times New Roman;">

<table border="0" cellspacing="0" cellpadding="0" style="border-collapse:collapse;">
 <tr style="page-break-inside:avoid;">
  <td width="85" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in .7pt 0in 0in;width:63.6pt;">
  <p style="font-size:8.0pt;font-weight:bold;line-height:8.0pt;margin:0in 0in .0001pt;text-align:center;"><!-- SET mrlHTMLTableCenter --><!-- SET mrlNoTableShading -->Exhibit Number</p>
  </td>
  <td width="12" valign="bottom" style="padding:0in .7pt 0in 0in;width:9.0pt;">
  <p style="font-weight:bold;line-height:8.0pt;margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></b></p>
  </td>
  <td width="575" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in .7pt 0in 0in;width:431.3pt;">
  <p align="left" style="font-weight:bold;line-height:8.0pt;margin:0in 0in .0001pt;text-align:left;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;">Description</font></b></p>
  </td>
 </tr>
 <tr style="page-break-inside:avoid;">
  <td width="85" valign="top" style="border:none;padding:0in .7pt 0in 0in;width:63.6pt;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">99.1</font></p>
  </td>
  <td width="12" valign="top" style="padding:0in .7pt 0in 0in;width:9.0pt;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="575" valign="top" style="border:none;padding:0in .7pt 0in 0in;width:431.3pt;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">A press release dated July 16, 2007 titled &#147;Steel
  Dynamics Ships First Order of Welded Rail.&#148;</font></p>
  </td>
 </tr>
</table>

</div>

<p align="center" style="margin:0in 0in 12.0pt;page-break-after:avoid;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">&nbsp;</font></b></p>


<br><hr size="3" width="100%" noshade color="#010101" align="center">

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<p align="center" style="margin:0in 0in 12.0pt;page-break-after:avoid;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">SIGNATURE</font></b></p>

<p style="margin:0in 0in 12.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Pursuant to the
requirements of the Securities Exchange Act of 1934, the registrant has duly
caused this Report to be signed on its behalf by the undersigned hereto duly
authorized.</font></p>

<table border="0" cellspacing="0" cellpadding="0" width="100%" style="border-collapse:collapse;font-family:Times New Roman;width:100.0%;">
 <tr style="page-break-inside:avoid;">
  <td width="51%" valign="top" style="padding:0in .7pt 0in 0in;width:51.58%;">
  <p style="font-size:10.0pt;margin:0in 0in .0001pt;"><!-- SET mrlNoTableShading --></p>
  </td>
  <td width="48%" colspan="2" valign="top" style="padding:0in .7pt 0in 0in;width:48.42%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">STEEL DYNAMICS, INC.</font></p>
  </td>
 </tr>
 <tr style="page-break-inside:avoid;">
  <td width="51%" valign="top" style="padding:0in .7pt 0in 0in;width:51.58%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="48%" colspan="2" valign="top" style="padding:0in .7pt 0in 0in;width:48.42%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr style="page-break-inside:avoid;">
  <td width="51%" valign="top" style="padding:0in .7pt 0in 0in;width:51.58%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="48%" colspan="2" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in .7pt 0in 0in;width:48.42%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">/s/Theresa E. Wagler</font></p>
  </td>
 </tr>
 <tr style="page-break-inside:avoid;">
  <td width="51%" valign="top" style="padding:0in .7pt 0in 0in;width:51.58%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Date: July 16, 2007</font></p>
  </td>
  <td width="4%" valign="top" style="border:none;padding:0in .7pt 0in 0in;width:4.84%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">By:</font></p>
  </td>
  <td width="43%" valign="top" style="border:none;border-top:solid windowtext 1.0pt;padding:0in .7pt 0in 0in;width:43.58%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Theresa E. Wagler</font></p>
  </td>
 </tr>
 <tr style="page-break-inside:avoid;">
  <td width="51%" valign="top" style="padding:0in .7pt 0in 0in;width:51.58%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="4%" valign="top" style="padding:0in .7pt 0in 0in;width:4.84%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="43%" valign="top" style="padding:0in .7pt 0in 0in;width:43.58%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr style="page-break-inside:avoid;">
  <td width="51%" valign="top" style="padding:0in .7pt 0in 0in;width:51.58%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="4%" valign="top" style="padding:0in .7pt 0in 0in;width:4.84%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Title:</font></p>
  </td>
  <td width="43%" valign="top" style="padding:0in .7pt 0in 0in;width:43.58%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Vice President</font></p>
  </td>
 </tr>
</table>

<p style="font-weight:bold;margin:0in 0in 12.0pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></b></p>



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<TYPE>EX-99.1
<SEQUENCE>2
<FILENAME>a07-19630_1ex99d1.htm
<DESCRIPTION>EX-99.1
<TEXT>
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<body lang="EN-US">

<div style="font-family:Times New Roman;">

<p align="right" style="margin:0pt 0pt 12.0pt;text-align:right;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Exhibit&nbsp;99.1</font></b></p>

<p align="right" style="margin:0pt 0pt 3.0pt;text-align:right;"><b><font size="2" face="Times New Roman" style="font-weight:bold;"><img width="201" height="45" src="g196301mai001.jpg"></font></b></p>

<table border="0" cellspacing="0" cellpadding="0" width="100%" style="border-collapse:collapse;width:100.0%;">
 <tr style="page-break-inside:avoid;">
  <td width="50%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:50.0%;">
  <p style="font-size:10.0pt;margin:0pt 0pt .0001pt;"><!-- SET mrlNoTableShading --><b>Press Release</b></p>
  </td>
  <td width="50%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:50.0%;">
  <p align="right" style="margin:0pt 0pt .0001pt;text-align:right;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">6714 Pointe Inverness
  Way, Suite 200</font></p>
  </td>
 </tr>
 <tr style="page-break-inside:avoid;">
  <td width="50%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:50.0%;">
  <p style="margin:0pt 0pt .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">July 16, 2007</font></b></p>
  </td>
  <td width="50%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:50.0%;">
  <p align="right" style="margin:0pt 0pt .0001pt;text-align:right;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Fort Wayne, IN
  46804-7932</font></p>
  </td>
 </tr>
 <tr style="page-break-inside:avoid;">
  <td width="50%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:50.0%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="50%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:50.0%;">
  <p align="right" style="margin:0pt 0pt .0001pt;text-align:right;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">260.459.3553 Phone</font></p>
  </td>
 </tr>
 <tr style="page-break-inside:avoid;">
  <td width="50%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:50.0%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="50%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:50.0%;">
  <p align="right" style="margin:0pt 0pt .0001pt;text-align:right;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">260.969.3590 Fax</font></p>
  </td>
 </tr>
 <tr style="page-break-inside:avoid;">
  <td width="50%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:50.0%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="50%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:50.0%;">
  <p align="right" style="margin:0pt 0pt .0001pt;text-align:right;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">www.steeldynamics.com</font></p>
  </td>
 </tr>
</table>

<p style="margin:0pt 0pt 12.0pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">&nbsp;</font></b></p>

<p style="margin:0pt 0pt 12.0pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Steel Dynamics Ships First Order
of Welded Rail</font></b></p>

<p style="font-size:10.0pt;margin:0pt 0pt 12.0pt;"><i><font size="2" face="Times New Roman" style="font-size:10.0pt;font-style:italic;">FORT WAYNE, INDIANA</font></i>,
July 16, 2007 &#151;Steel Dynamics, Inc. (NASDAQ-GS:STLD) announced that it has made
its first shipments of welded rails from its recently completed rail welding
operation at Columbia City, Indiana. This is the first commercial use of the
new rail-welding facility located on the site of SDI&#146;s Structural and Rail
mill. The shipments consisted of 81 rail strings, each 1,360 feet in
length&#151;about one quarter of a mile long. Each rail string resulted from welding
together seventeen 80-foot rails. The rail strings were then transported by two
rail trains of specially outfitted flat-bed railcars and delivered to an
industrial site in southern Indiana.</p>

<p style="margin:0pt 0pt 12.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">The completion of this
first order demonstrates the new facility&#146;s capability to successfully perform
a high volume of automated welds and to handle and load the completed rail
strings. Today, SDI is prepared to offer this rail-welding service on a
contract basis for Class I railroads and other users of welded rail. Because
the Steel Dynamics mill is not yet in volume production of rails, the initial
rail welding utilized rail that was provided by the customer. Going forward,
the facility is expected to be available for welding rails provided by third
parties and for rails produced on-site by the Steel Dynamics rail mill.</font></p>

<p style="margin:0pt 0pt 12.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&#147;Our state-of-the-art
rail-welding facility provides additional value for railroad applications
requiring welded rail strings up to 1,600 feet in length,&#148; said Paul Kotsenas,
SDI&#146;s sales manager for rail products. &#147;While this initial shipment involved
welding 80-foot rail segments, we look forward to early next year when we
expect to produce and utilize our own 240- to 360-foot rails, which no one else
in North America produces, to fabricate long rail strings. Continuous-welded
rail-strings provide the railroads with numerous benefits in the installation
and maintenance of their right-of-ways. By reducing the number of individual
rails and the number of welds utilized in a mile of track, railroads can
significantly reduce the probability and frequency of track weld failures and
reduce overall track maintenance costs.&#148;</font></p>

<p style="margin:0pt 0pt 12.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">SDI&#146;s new rail-welding
facility&#146;s rail spurs, buildings, and run-out beds extend more than one-half
mile across company-owned property to the west of the Columbia City mill. The
facility includes unique holding and staging tables that have the capacity to
store more than a trainload of finished strings. Rail spurs are in place to
deploy two long continuous-welded-rail trains for staging and loading. More
than a mile of new rail spurs was installed at the site to support the
operation. The cost of the rail-welding facility was about $15 million. After a
ramp-up of rail production, SDI expects to be able to supply about 300,000 tons
of rail per year from the Columbia City mill to help meet North American
railroads&#146; growing demand for rails.</font></p>

<p style="font-weight:bold;margin:0pt 0pt 12.0pt;"><b><u><font size="2" face="Times New Roman" style="font-size:10.0pt;">Forward Looking Statements</font></u></b></p>

<p style="margin:0pt 0pt 12.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">This
press release contains predictive statements about future events, including the
successful production of rail and welded rail products, market acceptance of
these products, as well as an expectation of sufficient market demand and the
company&#146;s successful market penetration for the products produced. These
statements are intended to be made as &#147;forward-looking,&#148; subject to many risks and uncertainties, within
the safe harbor protections of the Private Securities Litigation Reform Act of
1995. Such predictive statements are not
guarantees of future performance, and actual results could differ materially
from our current expectations.</font></p>

<p style="margin:0pt 0pt 12.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">We
refer you to SDI&#146;s detailed explanation of the many factors and risks that may
cause such predictive statements to turn out differently, as set forth in our
most recent Annual Report on Form 10-K and in other reports which we from time
to time file with the Securities and Exchange Commission, available publicly on
the SEC&#146;s Web site, <i>www.sec.gov</i> and
on the company&#146;s Web site, <i>www.steeldynamics.com.</i></font></p>

<p style="font-weight:bold;margin:0pt 0pt 12.0pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;">Contact:&#160; Fred Warner, Investor Relations Manager,
(260) 969-3564 or </font></b><font size="2" face="Times New Roman" style="font-size:10.0pt;">f.warner@steeldynamics.com</font></p>

</div><br><hr size="3" width="100%" noshade color="#010101" align="center">

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