<SUBMISSION>
<ACCESSION-NUMBER>0001104659-07-057811
<TYPE>8-K
<PUBLIC-DOCUMENT-COUNT>3
<PERIOD>20070731
<ITEMS>8.01
<ITEMS>9.01
<FILING-DATE>20070801
<DATE-OF-FILING-DATE-CHANGE>20070801
<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>071015314
</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
<SEQUENCE>1
<FILENAME>a07-20848_18k.htm
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<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="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;"><br>
SECURITIES AND EXCHANGE COMMISSION<br>
</font></b><b>WASHINGTON,
DC&#160; 20549</b></p>

<div style="line-height:9.0pt;margin:0in 0in 11.5pt;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 12.0pt;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 12.0pt;text-align:center;"><b><font size="3" face="Times New Roman" style="font-size:12.0pt;font-weight:bold;">CURRENT
REPORT<br>
Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934</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;<b>August 1, 2007 (July 31,
2007)</b></font></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;">STEEL
DYNAMICS, INC.<u><br>
</u></font></b>(Exact name of registrant as specified in its charter)</p>

<div align="center">

<table border="0" cellspacing="0" cellpadding="0" width="100%" style="border-collapse:collapse;width:100.0%;">
 <tr>
  <td width="38%" valign="top" style="padding:0in .7pt 0in .7pt;width:38.48%;">
  <p align="center" style="font-size:10.0pt;margin:0in 0in .0001pt;text-align:center;"><!-- SET mrlNoTableShading --><b>Indiana</b></p>
  </td>
  <td width="30%" valign="top" style="padding:0in .7pt 0in .7pt;width:30.76%;">
  <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="30%" valign="top" style="padding:0in .7pt 0in .7pt;width:30.76%;">
  <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="38%" valign="top" style="padding:0in .7pt 0in .7pt;width:38.48%;">
  <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</font></p>
  </td>
  <td width="30%" valign="top" style="padding:0in .7pt 0in .7pt;width:30.76%;">
  <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="30%" valign="top" style="padding:0in .7pt 0in .7pt;width:30.76%;">
  <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</font></p>
  </td>
 </tr>
 <tr>
  <td width="38%" valign="top" style="padding:0in .7pt 0in .7pt;width:38.48%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">of
  incorporation)</font></p>
  </td>
  <td width="30%" valign="top" style="padding:0in .7pt 0in .7pt;width:30.76%;">
  <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="30%" valign="top" style="padding:0in .7pt 0in .7pt;width:30.76%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">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 12.0pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Registrant&#146;s
telephone number, including area code:&#160; <b>260-459-3553</b></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;">Not
Applicable<br>
</font></b>(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;"><font size="2" face="Wingdings" style="font-size:10.0pt;">o</font>&nbsp;&nbsp;
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;"><font size="2" face="Wingdings" style="font-size:10.0pt;">o</font>&nbsp;&nbsp;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;"><font size="2" face="Wingdings" style="font-size:10.0pt;">o</font>&nbsp;&nbsp;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 .0001pt;"><font size="2" face="Wingdings" style="font-size:10.0pt;">o</font>&nbsp;&nbsp;Pre-commencement
communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR
240.13e-4(c))</p>


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

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<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 .3in;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">On July 31, 2007, Steel Dynamics, Inc. issued a press
release entitled &#147;Steel Dynamics Structural Mill Project to Expand Capacity to
2 Million Tons.&#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 )&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; Exhibits.</font></p>

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 <tr style="page-break-inside:avoid;">
  <td width="6%" valign="bottom" style="padding:0in .7pt 0in 0in;width:6.82%;">
  <p style="font-size:8.0pt;font-weight:bold;line-height:8.0pt;margin:0in 0in .0001pt;page-break-after:avoid;text-align:center;"><!-- SET mrlNoTableShading --></p>
  </td>
  <td width="16%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in .7pt 0in 0in;width:16.02%;">
  <p style="font-weight:bold;line-height:8.0pt;margin:0in 0in .0001pt;page-break-after:avoid;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;">Exhibit Number</font></b></p>
  </td>
  <td width="4%" valign="bottom" style="padding:0in .7pt 0in 0in;width:4.96%;">
  <p style="font-weight:bold;line-height:8.0pt;margin:0in 0in .0001pt;page-break-after:avoid;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></b></p>
  </td>
  <td width="8%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in .7pt 0in 0in;width:8.18%;">
  <p align="left" style="font-weight:bold;line-height:8.0pt;margin:0in 0in .0001pt;page-break-after:avoid;text-align:left;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;">Description</font></b></p>
  </td>
  <td width="1%" valign="bottom" style="padding:0in .7pt 0in 0in;width:1.0%;">
  <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="63%" valign="bottom" style="padding:0in .7pt 0in 0in;width:63.04%;">
  <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>
 </tr>
 <tr style="page-break-inside:avoid;">
  <td width="6%" valign="top" style="padding:0in .7pt 0in 0in;width:6.82%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="16%" valign="top" style="padding:0in .7pt 0in 0in;width:16.02%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">99.1</font></p>
  </td>
  <td width="4%" valign="top" style="padding:0in .7pt 0in 0in;width:4.96%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="72%" colspan="3" valign="top" style="padding:0in .7pt 0in 0in;width:72.2%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">A press release dated July 31, 2007 titled &#147;Steel
  Dynamics Structural Mill Project to Expand Capacity to 2 Million Tons.&#148;</font></p>
  </td>
 </tr>
</table>

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



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<p align="center" style="margin:0pt 0pt 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:0pt 0pt 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>

<p style="margin:0pt 0pt 12.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></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="46%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:46.62%;">
  <p style="font-size:10.0pt;margin:0pt 0pt .0001pt;"><!-- SET mrlNoTableShading --></p>
  </td>
  <td width="4%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:4.96%;">
  <p style="margin:0pt 0pt .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="padding:0pt .7pt 0pt 0pt;width:48.42%;">
  <p style="margin:0pt 0pt .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="46%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:46.62%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="4%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:4.96%;">
  <p style="margin:0pt 0pt .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:0pt .7pt 0pt 0pt;width:48.42%;">
  <p style="margin:0pt 0pt .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="46%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:46.62%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="4%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:4.96%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="36%" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0pt .7pt 0pt 0pt;width:36.7%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">/s/ Theresa E. Wagler</font></p>
  </td>
  <td width="11%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:11.72%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr style="page-break-inside:avoid;">
  <td width="46%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:46.62%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Date: August 1, 2007</font></p>
  </td>
  <td width="4%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:4.96%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">By: </font></p>
  </td>
  <td width="48%" colspan="2" valign="top" style="padding:0pt .7pt 0pt 0pt;width:48.42%;">
  <p style="margin:0pt 0pt .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="46%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:46.62%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="4%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:4.96%;">
  <p style="margin:0pt 0pt .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="padding:0pt .7pt 0pt 0pt;width:48.42%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Title: Vice President</font></p>
  </td>
 </tr>
</table>

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



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<TYPE>EX-99.1
<SEQUENCE>2
<FILENAME>a07-20848_1ex99d1.htm
<DESCRIPTION>EX-99.1
<TEXT>
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<h4 align="right" style="font-weight:normal;margin:0pt 0pt 12.0pt;page-break-after:avoid;text-align:right;"><font style="height:35px;left:0px;margin-left:493px;margin-top:24px;position:absolute;width:174px;z-index:1;"><img width="174" height="35" src="g208481kmi001.jpg"></font><font size="2" face="Times New Roman">Exhibit 99.1</font></h4>

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<table border="0" cellspacing="0" cellpadding="0" width="100%" style="border-collapse:collapse;width:100.0%;">
 <tr>
  <td width="44%" valign="top" style="padding:0pt .7pt 0pt .7pt;width:44.68%;">
  <p style="font-size:10.0pt;margin:0pt 0pt .0001pt;"><!-- SET mrlNoTableShading --><b><font size="3" style="font-size:12.0pt;font-weight:bold;">Press Release</font></b></p>
  </td>
  <td width="55%" valign="top" style="padding:0pt .7pt 0pt .7pt;width:55.32%;">
  <p align="right" style="margin:0pt 0pt .0001pt;text-align:right;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="44%" valign="top" style="padding:0pt .7pt 0pt .7pt;width:44.68%;">
  <p style="margin:0pt 0pt .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">July 31, 2007</font></b></p>
  </td>
  <td width="55%" valign="top" style="padding:0pt .7pt 0pt .7pt;width:55.32%;">
  <p align="right" style="margin:0pt 0pt .0001pt;text-align:right;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="44%" valign="top" style="padding:0pt .7pt 0pt .7pt;width:44.68%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="55%" valign="top" style="padding:0pt .7pt 0pt .7pt;width:55.32%;">
  <p align="right" style="margin:0pt 0pt .0001pt;text-align:right;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="44%" valign="top" style="padding:0pt .7pt 0pt .7pt;width:44.68%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="55%" valign="top" style="padding:0pt .7pt 0pt .7pt;width:55.32%;">
  <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>
  <td width="44%" valign="top" style="padding:0pt .7pt 0pt .7pt;width:44.68%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="55%" valign="top" style="padding:0pt .7pt 0pt .7pt;width:55.32%;">
  <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>
  <td width="44%" valign="top" style="padding:0pt .7pt 0pt .7pt;width:44.68%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="55%" valign="top" style="padding:0pt .7pt 0pt .7pt;width:55.32%;">
  <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>
  <td width="44%" valign="top" style="padding:0pt .7pt 0pt .7pt;width:44.68%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="55%" valign="top" style="padding:0pt .7pt 0pt .7pt;width:55.32%;">
  <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>
  <td width="44%" valign="top" style="padding:0pt .7pt 0pt .7pt;width:44.68%;">
  <p style="margin:0pt 0pt .0001pt;"><i><font size="2" face="Times New Roman" style="font-size:1.0pt;font-style:italic;">&nbsp;</font></i></p>
  </td>
  <td width="55%" valign="top" style="padding:0pt .7pt 0pt .7pt;width:55.32%;">
  <p align="right" style="margin:0pt 0pt .0001pt;text-align:right;"><i><font size="2" face="Times New Roman" style="font-size:10.0pt;font-style:italic;">www.steeldynamics.com</font></i></p>
  </td>
 </tr>
 <tr>
  <td width="44%" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0pt .7pt 0pt .7pt;width:44.68%;">
  <p style="margin:0pt 0pt .0001pt;"><i><font size="2" face="Times New Roman" style="font-size:10.0pt;font-style:italic;">&nbsp;</font></i></p>
  </td>
  <td width="55%" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0pt .7pt 0pt .7pt;width:55.32%;">
  <p align="right" style="margin:0pt 0pt .0001pt;text-align:right;"><i><font size="2" face="Times New Roman" style="font-size:10.0pt;font-style:italic;">&nbsp;</font></i></p>
  </td>
 </tr>
</table>

</div>

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

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

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

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

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

<p style="margin:0pt 0pt 12.0pt;"><b><font size="3" face="Times New Roman" style="font-size:12.0pt;font-weight:bold;">Steel Dynamics Structural Mill
Project to Expand Capacity to 2 Million Tons</font></b></p>

<p style="font-family:Times New Roman;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 31, 2007 &#151;Steel Dynamics, Inc. (NASDAQ-GS:STLD) today announced that its
Board of Directors has approved an additional investment of $75 million at its
Structural and Rail Division at Columbia City, Indiana, designed to increase
the mill&#146;s combined production capacity for structural steel and rail to 2
million tons per year. The project is planned for completion in the fourth
quarter of 2008.</p>

<p style="margin:0pt 0pt 12.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">This project includes the
installation of a second caster to produce larger quantities of semi-finished
steel at the facility. This additional investment complements a previously
announced $200 million mill expansion, currently underway, to add a second
rolling mill. The new medium-section rolling mill, which will have the
capability to roll some of the lighter products currently made on the existing
mill as well as other new light structural-steel products, will have a rolling
capacity of about 1 million tons per year.</font></p>

<p style="margin:0pt 0pt 12.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">The second caster will
provide steel to permit each of the two rolling mills ultimately to operate at
a production capacity of approximately 1 million tons per year. The new
bloom/billet caster will be installed initially with four strands, expandable
to five strands in the future as warranted by market conditions. The additional
caster will result in the addition of about 50 new jobs at the mill.</font></p>

<p style="margin:0pt 0pt 12.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&#147;Since Steel Dynamics
announced the addition of the second rolling mill at Columbia City last year,
the markets for structural and rail products have remained strong and our
assessment is that this is a market where Steel Dynamics can continue to grow,&#148;
said Dick Teets, President and COO for Steel Shapes and Building Products. &#147;We
believe the combination of the customer relationships we have built in the five
years since we entered the structural steel business, our central upper-Midwest
location, and our low cost-structure will allow us to compete successfully as
we expand our capacity to serve the market and introduce new products to the
marketplace.</font></p>

<p style="margin:0pt 0pt 12.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&#147;We are acting now to add
the needed casting capacity to allow the new rolling mill to ramp up more
quickly to its rated capacity. When the medium-section mill project was
announced a year ago, we expected to meet some of the needs of the new mill
from excess production of semi-finished steel shipped from the company&#146;s
Pittsboro bar mill. Since then, we decided to increase our rolling capacity at
Pittsboro, which will commit that semi-finished steel for the Pittsboro mill&#146;s
own use. Producing additional semi-finished steel at Columbia City will lower
costs and further compress the Division&#146;s cost per ton.&#148; Teets said.</font></p>

<p style="margin:0pt 0pt 12.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Production volume at the
Columbia City mill has grown significantly since its start-up in July of 2002,
allowing the mill to ship more than 1 million tons in 2006 and to operate at a
rate of nearly 1.2-million tons per year in the first half of 2007. The mill
was built with the flexibility to produce wide-flange beams&#151;with web height in
a range from 6 to 36 inches&#151;and h-piling, and to produce standard- and
premium-quality long rails for railway use. Although the mill has been
commissioned to produce rail, thus far only limited quantities of rail have
been produced for sale because of strong demand and orders for wide-flange
beams for the non-residential construction market.</font></p>

<p style="margin:0pt 0pt 12.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">After these projects are
completed, the Columbia City operation will have the flexibility to schedule
each of its rolling mills to produce the products best suited to their
capabilities as well as adjust the production plan to produce a mix of products
best matched to market demand. Current estimates of a possible annual product
mix under full-utilization conditions would be 1.4 million tons of wide-flange
beams and h-piling, 300,000 tons of light structural shapes (including angles,
channels, and flats), and 300,000 tons of rail.</font></p>


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

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<p style="margin:0pt 0pt 12.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</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 and steel
market conditions, including investments in additional production capacity at
the company&#146;s facilities and the successful operation of those facilities after
the investments are made, 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, www.sec.gov and on the company&#146;s Web site,
www.steeldynamics.com<i><u style="font-style:italic;">.</u></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;font-weight:normal;">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>

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



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

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