Exhibit 99.1

Press Release October 16, 2007
	6714 Pointe Inverness Way, Suite 200
	Fort Wayne, IN 46804-7932
	260.459.3553 Phone
	260.969.3590 Fax
	www.steeldynamics.com

Steel Dynamics Reports Strong Sequential Earnings, Revenue and Volume Growth

FORT WAYNE, INDIANA, October 16, 2007– Steel Dynamics, Inc. (NASDAQ-GS: STLD) today announced third quarter earnings of $101 million, or $1.06 per diluted share, after purchase accounting adjustments related to the company’s recent acquisition of The Techs in July of approximately $0.01 per diluted share. Diluted earnings per share increased 12 percent sequentially from $0.95 in the second quarter of 2007, but were 2 percent lower than $1.09 in the third quarter of 2006. SDI’s third quarter diluted earnings per share of $1.06 are within the company’s range of $1.02 to $1.07 per diluted share updated on August 30, 2007.

Third quarter revenues increased to $1.2 billion, 27 percent higher than both the year-ago quarter and the second quarter of 2007. Third quarter consolidated shipments of 1.6 million tons increased 26 percent as compared to the year-ago quarter. The sequential volume increase from the second quarter of approximately 336,000 tons, or 27%, was due primarily to increased shipments of 335,000 tons from the company’s steel operations, of which 231,000 tons were from The Techs and 110,000 tons were from increased shipments by the Flat Roll Division.

During the first nine months of 2007, net income grew to $297 million on revenues of $2.9 billion. Year-to-date diluted earnings per share were $3.02, 11 percent ahead of last year. Consolidated shipments for the first nine months grew 15 percent to 4.1 million tons, compared to 3.5 million tons in the first nine months of 2006. The company’s steel operations showed increased year-over-year nine-month shipments of nearly 513,000 tons, or 14 percent.

“Overall, Steel Dynamics is experiencing another strong year,” said Keith Busse, Chairman and CEO. “From an operating standpoint, we saw sequential improvement from the second quarter, in spite of continued softness in flat-rolled steels and some spotty slowness in merchant and specialty bar steels.

“The integration of The Techs is proceeding well. The Techs represents an increase in steel operating revenues and volumes. The product mix sold by The Techs generally elicits higher average selling values, but the resulting operating margins are somewhat lower than traditionally experienced at SDI as The Techs do not currently produce their own substrate as does our Flat Roll Division. Consequently, as the operations exist, consolidating The Techs operating results will generally increase cost of goods sold as a percentage of net sales; however, we hope to internally provide The Techs with more substrate at some point. At this time we expect The Techs acquisition to be accretive for the fourth quarter of 2007.”

In the third quarter, the company’s operating income was $111 per ton shipped with an operating margin of 15 percent, compared with second quarter operating income of $136 per ton shipped and an operating margin of 18 percent. The third quarter’s average consolidated selling price per ton decreased to $737 from $739 in the second quarter of 2007 but increased $4 from the year-ago quarter. The average scrap cost per net ton charged decreased $21 compared to the second quarter, which had seen an increase of $44 from the first quarter.

“The outlook for the fourth quarter is positive,” Busse said. “The costs of ferrous resources have trended down and we expect them to remain relatively stable going into winter. We expect selling prices to remain steady or increase slightly. Market demand for flat-rolled steel should improve in the fourth quarter due to inventory de-stocking and limited imports. We expect continued strength in our long products mills, particularly structural steel that is used in the non-residential construction markets. We currently expect fourth quarter earnings will be in a range of $1.02 to $1.07 per diluted share, excluding any impact from the planned acquisition of OmniSource Corporation. This early guidance closely parallels our third quarter, as improved market conditions will be offset by scheduled outages for upgrades at three of our five mills. We will provide updated guidance to reflect the effect of the acquisition of OmniSource, which we believe could be accretive, after the transaction closes in early November.

“During the third quarter, we made two important announcements that have strong implications for our future,” Busse continued. “The acquisition of OmniSource helps anchor our supply of domestic ferrous scrap resources and the commencement of the Mesabi Nugget project develops future self-sufficiency in pig-iron supply, both of which are critical steps in providing a strong platform for future growth initiatives.

“The acquisition of OmniSource creates an environment that allows us to capture margins at every step of the value chain. We believe that scrap resources in the future could become scarce at times due to increasing global demand and a softer U.S. dollar. Given these assumptions, we anticipate scrap margins could increase in the future and we hope to continue to grow this arm of our business. OmniSource can, at times, provide SDI with a more dependable, nearby supply of high-quality steel scrap and affords SDI a measure of protection from supply chain shortages under certain market conditions.

“Our plan to develop iron resources on the Mesabi Range in Minnesota promises to provide a consistent future supply of high-quality, lower-cost iron nuggets (i.e., pig iron) for use in our mini mills. We expect ultimately to control the entire process from mining, concentrating, and then direct reduction of the concentrate into pig iron. We believe that the economics of production will make these resources attractive compared to imported pig iron today and even more attractive as global demand grows and the cost of iron units continues to increase. We have demonstrated that the use of these resources in our electric-arc furnaces result in numerous operating advantages, including better management of residuals, lower electrode utilization, improved yields, and increased output by reducing tap-to-tap times.”

During the third quarter, the company continued its share repurchase program. A total of 4.9 million shares were repurchased during the quarter for approximately $198 million. At the end of the quarter, the company had 5.0 million shares authorized for repurchase. At September 30, 2007, the company had approximately 87.2 million shares of common stock outstanding.

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 earnings, 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.

Factors that could cause such predictive statements to turn out other than as anticipated or predicted include, among others: changes in economic conditions affecting steel consumption; increased foreign imports; increased price competition; difficulties in integrating acquired businesses; risks and uncertainties involving new products or new technologies; changes in the availability or cost of steel scrap or substitute materials; increases in energy costs; occurrence of unanticipated equipment failures and plant outages; labor unrest; and the effect of the elements on production or consumption.

In addition, we refer you to SDI’s detailed explanation of these and other 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.com

Forward-looking or predictive statements we make are based on our knowledge of our businesses and the environment in which they operate as of the date on which the statements were made. Due to these risks and uncertainties, as well as matters beyond our control which can affect forward-looking statements, you are cautioned not to place undue reliance on these predictive statements, which speak only as of the date of this press release. We undertake no duty to update or revise any forward-looking statement, whether as a result of new information, future events or otherwise.

Conference Call and Webcast

On Wednesday, October 17, 2007 at 11:00 am EDT, Steel Dynamics will host a conference call in which Steel Dynamics’ management will discuss third quarter 2007 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

Steel Dynamics, Inc.

UNAUDITED CONSOLIDATED STATEMENTS OF INCOME

(in thousands, except per share data)

	Three Months Ended						Nine Months Ended					Three Months Ended
	September 30,						September 30,					June 30,
	2007			2006			2007		2006			2007

Net Sales	$	1,156,593		$	911,862		$	2,933,515	$	2,398,987		$	911,248

Costs of goods sold	928,142			667,058			2,272,079		1,798,141			694,666
Selling, general, and administrative expenses	54,524			46,224			148,538		117,006			48,922

Operating Income	173,927			198,580			512,898		483,840			167,660

Interest expense	14,602			7,445			29,048		23,606			7,198
Other (income) expense, net	(602		)	(974		)	10,205		(2,930		)	11,523

Income before income taxes	159,927			192,109			473,645		463,164			148,939

Income taxes	59,336			73,386			176,949		171,523			54,997

Net income	$	100,591		$	118,723		$	296,696	$	291,641		$	93,942

Basic earnings per share	$	1.12		$	1.19		$	3.18	$	3.09		$	1.01

Weighted average common shares outstanding	89,741			99,685			93,162		94,394			93,429

Diluted earnings per share,
Including effect of assumed conversions	$	1.06		$	1.09		$	3.02	$	2.73		$	.95
Weighted average common shares and share equivalents outstanding	94,929			109,785			98,449		106,932			98,781

Dividends declared per share	$	.15		$	.15		$	.45	$	.35		$	.15

Note: All prior period share data has been adjusted to include the company’s two-for-one stock split effective November 20, 2006.

Steel Dynamics, Inc.

UNAUDITED SUPPLEMENTAL OPERATING INFORMATION

	Three Months Ended						Nine Months Ended						First			Second
	September 30,						September 30,						Quarter			Quarter
Shipments and Production Data (tons)	2007			2006			2007			2006			2007			2007

Shipments
Steel Operations*
Flat Roll Division	689,762			644,164			1,881,361			1,960,284			612,109			579,490
Structural and Rail Division	302,141			261,725			895,618			751,485			283,876			309,601
Engineered Bar Products Division	133,795			130,531			408,130			380,013			142,359			131,976
Roanoke Bar Division	142,243			166,428			453,253			312,688			170,611			140,399
Steel of West Virginia	69,024			85,906			214,457			166,318			74,487			70,946
The Techs	230,691			—			230,691			—			—			—
	1,567,656			1,288,754			4,083,510			3,570,788			1,283,442			1,232,412

Steel Fabrication Operations**	70,005			66,205			205,376			167,756			66,507			68,864
Steel Scrap and Scrap Substitute ***	167,174			93,197			442,254			234,841			98,234			176,846
Other Operations****	34,107			16,138			93,576			70,285			33,113			26,356
Intercompany	(270,492		)	(220,033		)	(767,538		)	(522,082		)	(225,095		)	(271,951		)
Consolidated shipments	1,568,450			1,244,261			4,057,178			3,521,588			1,256,201			1,232,527

Steel Operations* production	1,510,644			1,263,098			4,007,269			3,494,201			1,250,387			1,246,238

Average Selling Price Per Ton
Steel Operations*	$	699		$	693		$	682		$	650		$	646		$	696
Consolidated	737			733			723			681			689			739

* Steel Operations include the company’s Flat Roll Division, Structural and Rail Division, Engineered Bar Products Division, Roanoke Bar Division, Steel of West Virginia, and The Techs operations.

** Steel Fabrication Operations include the company’s five joist and deck fabrication plants located in Indiana, Florida, Ohio, Virginia, and South Carolina.

*** Steel Scrap and Scrap Substitute Operations include Iron Dynamics and the company’s scrap processing facilities, of which two were purchased April 1, 2007.

**** Other Operations include Paragon Steel Enterprises and Dynamic Composites operations.

Steel Dynamics, Inc.

CONSOLIDATED BALANCE SHEETS

(in thousands)

	September 30, 2007			December 31, 2006
	(unaudited)
Assets
Current assets
Cash and equivalents	$	10,811		$	29,373
Accounts receivable	491,457			408,376
Inventories	744,534			569,317
Deferred income taxes	16,080			13,964
Other current assets	27,264			15,167
Total current assets	1,290,146			1,036,197

Property, plant and equipment, net	1,358,204			1,136,703

Restricted cash	6,643			5,702

Intangible assets	198,678			12,226

Goodwill	200,637			30,966

Other assets	40,993			25,223
Total assets	$	3,095,301		$	2,247,017

Liabilities and Stockholders’ Equity

Current liabilities
Accounts payable	$	325,564		$	147,942
Income taxes payable	31,739			30,497
Accrued expenses	120,429			94,024
Accrued profit sharing	42,363			46,341
Senior secured revolving credit facility	97,000			80,000
Senior secured Term Loan A facility	55,000			—
Other current maturities of long-term debt	683			686
Total current liabilities	672,778			399,490

Long-term debt
Senior secured Term Loan A facility	495,000			—
9½% senior unsecured notes, due 2009	—			300,000
6¾% senior notes, due 2015	500,000			—
Convertible subordinated 4.0% notes due 2012	37,250			37,500
Other long-term debt	16,536			16,920
Unamortized bond premium	—			3,772
Total long-term debt	1,048,786			358,192

Deferred income taxes	292,802			256,803

Minority interest	976			1,424

Commitments and contingencies

Stockholders’ equity
Common stock	541			537
Treasury stock, at cost	(661,427		)	(230,472		)
Additional paid-in capital	392,269			367,772
Retained earnings	1,348,576			1,093,271
Total stockholders’ equity	1,079,959			1,231,108
Total liabilities and stockholders’ equity	$	3,095,301		$	2,247,017

Steel Dynamics, Inc.

UNAUDITED CONSOLIDATED STATEMENTS OF CASH FLOWS

(in thousands)

	Three Months Ended						Nine Months Ended
	September 30,						September 30,
	2007			2006			2007			2006

Operating activities:
Net income	$	100,591		$	118,723		$	296,696		$	291,641

Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	33,853			30,616			96,096			87,293
Unamortized bond premium	—			—			(3,350		)	—
Equity-based compensation	1,817			—			6,218			—
Deferred income taxes	(562		)	(2,997		)	(1,679		)	(8,731		)
Minority interest	107			68			(448		)	696
Changes in certain assets and liabilities:
Accounts receivable	12,544			(48,907		)	(21,204		)	(78,891		)
Inventories	35,212			(29,043		)	(118,514		)	(42,857		)
Accounts payable	29,784			44,230			100,594			36,847
Income taxes payable	5,374			10,160			1,242			17,323
Other working capital	31,479			16,706			(7,284		)	(6,473		)
Net cash provided by operating activities	250,199			139,556			348,367			296,848

Investing activities:
Purchase of property, plant and equipment	(99,935		)	(35,645		)	(255,845		)	(84,354		)
Acquisition of business, net of cash acquired	(373,407		)	—			(411,626		)	(89,106		)
Purchase of short-term investments	—			—			—			(14,075		)
Maturities of short-term investments	—			—			—			14,075
Other investing activities	169			—			7			242
Net cash used in investing activities	(473,173		)	(35,645		)	(667,464		)	(173,218		)

Financing activities:
Issuance of long-term debt	798,000			65,000			1,795,000			65,000
Repayment of long-term debt	(366,230		)	(35,395		)	(1,028,387		)	(81,698		)
Issuance of common stock (net of expenses) and proceeds and tax benefits from exercise of stock options	4,113			4,638			20,260			31,995
Issuance (purchase) of treasury stock	(197,867		)	(161,148		)	(433,183		)	(160,360		)
Dividends paid	(13,840		)	(10,111		)	(42,564		)	(23,242		)
Debt issuance costs	(2,603		)	—			(10,591		)	—

Net cash provided by/(used in) financing activities	221,573			(137,016		)	300,535			(168,305		)
Decrease in cash and equivalents	(1,401		)	(33,105		)	(18,562		)	(44,675		)
Cash and equivalents at beginning of period	12,212			53,948			29,373			65,518
Cash and equivalents at end of period	$	10,811		$	20,843		$	10,811		$	20,843

Supplemental disclosure of cash flow information:
Cash paid for interest	$	4,563		$	15,016		$	22,921		$	31,455
Cash paid for federal and state income taxes	$	51,236		$	60,421		$	183,521		$	155,962

Indiana	0-21719	35-1929476
(State or other jurisdiction	(Commission File Number)	(IRS Employer
of incorporation)		Identification No.)

Exhibit Number		Description
99.1		A press release dated October 16, 2007 titled “Steel Dynamics Reports Strong Sequential Earnings, Revenue and Volume Growth”

		STEEL DYNAMICS, INC.

		/s/ Theresa E. Wagler

Date: October 18, 2007	By:	Theresa E. Wagler
	Title:	Chief Financial Officer