6714 Pointe Inverness Way, Suite 200 Fort Wayne, IN 46804-7932 260.459.3553 Phone 260.969.3590 Fax www.steeldynamics.com

Steel Dynamics Sets Sales and Earnings
Records for Third Quarter

FORT WAYNE, INDIANA, October 18, 2004– Steel Dynamics, Inc. (NASDAQ: STLD) today announced record third quarter earnings of $114 million, or $2.01 per diluted share. Net sales for the third quarter of 2004 were a record $635 million, an increase of 21 percent from the second quarter of 2004 and 150 percent higher than the third quarter of 2003. Net income for the first nine months of 2004 was $213 million, or $3.80 per diluted share, a seven-fold increase over 2003. This year’s third quarter earnings exceeded the company’s earnings for the first half of the year, and were greater than any prior year.

“Not only did the third quarter set company records for both sales and earnings,” said Keith Busse, President and CEO of Steel Dynamics, “but several of our operations set monthly and quarterly records for both production and shipments. As expected, the combination of greater shipping volumes, higher steel selling prices, and continued effective cost control produced profit margins for the third quarter that were well above historical levels. Our steel-making operations achieved a record quarterly operating profit of $216 per ton shipped.

“Although SDI’s extraordinary third-quarter results arose in part from strong market conditions, we believe structural changes in the domestic steel industry as well as SDI’s stronger competitive position have set the stage for sustainable profits at higher levels than we have achieved in the past. Some of the initiatives that have strengthened our market position include a growing volume of shipments made possible by recently added production capacity, an increasing diversity of steel-product offerings that serve new markets, and an improving mix of products with an emphasis on more value-added, finished steels,” Busse said.

Third quarter consolidated shipments of 898,000 tons were 21 percent higher than the third quarter of 2003. Year-to-date consolidated shipments of 2.6 million tons were 26 percent higher than the first nine months of 2003.

The Flat Roll Division continues to implement modifications to the hot mill to increase throughput, which resulted in record quarterly hot-band production of 639,000 tons. Flat Roll Division shipments were 611,000 tons. Both of the division’s new coating lines, the paint line at Butler and the galvanizing line at Jeffersonville, have now achieved rated capacity and set production and shipping records in the third quarter. During the quarter the Bar Products mill, which began shipments in the first quarter of 2004, operated at 75-80 percent of capacity, shipping 107,000 tons, a 30 percent increase over the second quarter. Structural Division shipments were 184,000 tons, 5 percent lower than the second quarter due to continued softness in the non-residential construction market.

Iron Dynamics, Inc., SDI’s wholly owned iron-producing subsidiary, increased production tonnage in the third quarter and achieved profitability in September. Currently IDI is producing iron at a rate of 67 percent of capacity, generating both hot-briquetted iron and liquid pig iron. During the third quarter, liquid pig iron from IDI was routinely used in the electric-arc furnaces at SDI’s Flat Roll melt shop.

In the third quarter, SDI’s consolidated average selling price was $706 per ton, which was $115 per ton higher than the second quarter of 2004. Third quarter scrap costs per net ton charged were $250, approximately $23 per ton higher than the second quarter of 2004 and approximately $122 per ton higher than third quarter of 2003.

Since the spring of 2002, Steel Dynamics has successfully recapitalized its balance sheet, achieving greater financial flexibility and broader access to the equity and financial markets. The company has reduced its long-term debt-to-equity ratio from close to 60% during 2001 to 40% at September 30, 2004. During the second week in October the company further reduced this ratio to 35% with the repayment of $100 million on its now undrawn $230 million senior secured revolving credit facility.

We see steel pricing in the fourth quarter softening somewhat, with scrap prices remaining high by historical standards, yet we nevertheless expect strong fourth quarter results. SDI’s 2004 net sales are expected to exceed $2 billion, more than double 2003 net sales. We believe fourth-quarter earnings will be in the range of $1.55 to $1.75 per diluted share, slightly higher than our earlier estimate. It should be noted that we will be replacing some of last year’s year-end supply agreements with agreements containing more favorable terms that should result in increased profitability related to these shipments.

“With our steel-producing operations continuing to expand production and shipments in 2005, we believe next year can be another strong year for SDI. After an increase in steel shipments of about 25 percent in 2004, next year’s volume could increase another 10 percent, with annual shipments approaching 4.0 million tons,” Busse said.

Conference Call and Webcast

On Tuesday, October 19, 2004 at 11:00 am Eastern, Steel Dynamics will host a conference call in which Steel Dynamics’ management will discuss third quarter 2004 results. You are invited to listen to the live audio broadcast of the conference call over the Internet, accessible from Steel Dynamics’ Web site:

www.steeldynamics.com

Dial-in information is available on our Web site. No telephone replay will be available. An audio replay of the Webcast will be available from the SDI Web site.

Contact:	Fred Warner, Investor Relations Manager, (260) 969-3564 or fax (260) 969-3590
	f.warner@steeldynamics.com

Forward Looking Statements

This press release contains some predictive statements about future events, including statements related to conditions in the steel marketplace, Steel Dynamics’ revenue growth, costs of raw materials, future profitability, and the operation of new or existing facilities. These statements are intended to be made as “forward-looking,” 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.

We refer you to SDI’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 Web site, www.sec.gov, and on the Steel Dynamics Web site, www.steeldynamics.co

Steel Dynamics, Inc.

UNAUDITED CONSOLIDATED STATEMENTS OF INCOME
(in thousands, except per share data)

	Three Months Ended September 30,						Nine Months Ended September 30,
	2004			2003			2004			2003
Net sales	$	634,741		$	253,952		$	1,544,543		$	708,088
Costs of goods sold		406,489			215,097			1,091,503			587,790
Selling, general and administrative expenses		34,992			16,010			86,124			45,667
Operating income		193,260			22,845			366,916			74,631
Interest expense		10,469			8,251			30,565			26,355
Other (income) expense, net		(458	)		(112	)		(5,704	)		(362	)
Income before income taxes		183,249			14,706			342,055			48,638
Income taxes		69,635			5,515			129,187			18,239
Net income	$	113,614		$	9,191		$	212,868		$	30,399
Basic earnings per share	$	2.29		$	.19		$	4.32		$	.64
Weighted average common shares outstanding		49,611			47,797			49,299			47,683
Diluted earnings per share,
including effect of assumed conversions	$	2.01		$	.19		$	3.80		$	.63
Weighted average common shares
and share equivalents outstanding		56,881			48,122			56,546			47,920

Steel Dynamics, Inc.

UNAUDITED SUPPLEMENTAL OPERATING INFORMATION

	Three Months Ended September 30,						Nine Months Ended September 30,
	2004			2003			2004			2003
Shipments and Production Data (tons)
Shipments
Steel Operations*	901,754			742,864			2,574,288			2,027,306
Other Operations**		82,279			49,676			263,632		140,021
Intercompany	(85,549		)	(48,025		)	(251,978		)	(122,166		)
Consolidated shipments	898,484			744,515			2,585,942			2,045,161
Steel Operations* production	916,724			762,430			2,614,892			2,167,947
Other Financial Data (dollars)
Average consolidated selling price per ton	$	706		$	341		$	597		$	346
Operating profit per ton shipped***		216			34			145			38
Start-up costs (in thousands)	$	—		$	2,196		$	5,140		$	3,717

*	Steel Operations include the company’s Flat Roll Division, Structural and Rail Division and Bar Products Division.
**	Other Operations include New Millennium Building Systems, Paragon Steel Trading and Iron Dynamics.
***	Operating profit per ton shipped represents operating income before start-up costs and minority interest adjustments divided by consolidated shipments.

Steel Dynamics, Inc.

CONSOLIDATED BALANCE SHEETS
(in thousands)

	September 30, 2004			December 31, 2003
	(unaudited)
Assets
Current assets
Cash and equivalents	$	159,674		$	65,430
Accounts receivable		247,752			126,023
Inventories		285,790			184,496
Deferred income taxes		8,883			23,217
Other current assets		15,383			8,769
Total current assets		717,482			407,935
Property, plant and equipment, net		1,014,698			1,001,116
Restricted cash		1,649			2,636
Other assets		31,184			36,752
Total assets	$	1,765,013		$	1,448,439
Liabilities and Stockholders’ Equity
Current liabilities
Accounts payable	$	145,481		$	79,326
Accrued interest		10,888			11,312
Accrued expenses		69,490			46,678
Current portion of long-term debt		2,277			15,988
Total current liabilities		228,136			153,304
Long-term debt, including bond premium of $7,569 and $8,834
at September 30, 2004 and December 31, 2003, respectively		548,724			591,586
Deferred income taxes		168,775			115,703
Minority interest		2,274			613
Commitments and contingencies
Stockholders’ equity
Common stock		520			509
Treasury stock, at cost		(28,719	)		(28,670	)
Additional paid-in capital		384,185			362,328
Retained earnings		462,671			257,254
Other accumulated comprehensive loss		(1,553	)		(4,188	)
Total stockholders’ equity		817,104			587,233
Total liabilities and stockholders’ equity	$	1,765,013		$	1,448,439

Steel Dynamics, Inc.

UNAUDITED CONSOLIDATED STATEMENTS OF CASH FLOWS
(in thousands)

	Three Months Ended September 30,							Nine Months Ended September 30,
	2004				2003			2004			2003
Operating activities
Net income		$	113,614		$	9,191		$	212,868		$	30,399
Adjustments to reconcile net income to net cash
provided by operating activities
Depreciation and amortization			21,731			17,472			64,139			50,391
Deferred income taxes			34,808			9,491			67,406			20,921
Minority interest			450			86			1,661			(541	)
Changes in certain assets and liabilities:
Accounts receivable			(48,598	)		(4,879	)		(121,729	)		1,361
Inventories			(5,620	)		2,043			(101,294	)		(18,177	)
Accounts payable			24,520			8,649			66,155			24,329
Other working capital			15,846			(2,600	)		21,627			(10,886	)
Net cash provided by operating activities			156,751			39,453			210,833			97,797
Investing activities
Purchase of property, plant and equipment			(18,212	)		(28,883	)		(72,872	)		(89,988	)
Other investing activities			—			—			—			(8,283	)
Net cash used in investing activities			(18,212	)		(28,883	)		(72,872	)		(98,271	)
Financing activities
Issuance of long-term debt			162			11,343			164,283			59,823
Repayment of long-term debt			(17,448	)		(14,588	)		(220,856	)		(64,488	)
Issuance of common stock (net of expenses) and proceeds
and tax benefits from exercise of stock options			7,243			2,744			21,868			4,414
Purchase of treasury stock			189			—			(49	)		(176	)
Dividends declared			(7,452	)		—			(7,452	)		—
Debt issuance costs			—			(413	)		(1,511	)		(1,733	)
Net cash used in financing activities			(17,306	)		(914	)		(43,717	)		(2,160	)
Increase (decrease) in cash and equivalents			121,233			9,656			94,244			(2,634	)
Cash and equivalents at beginning of period			38,441			11,928			65,430			24,218
Cash and equivalents at end of period		$	159,674		$	21,584		$	159,674		$	21,584