SEC FORM 3

SEC Form 3

FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person^*

DUKE TIMOTHY R

(Last)

(First)

(Middle)

P.O. BOX 2547

(Street)

HUNTINGTON

25726-2547

(City)

(State)

(Zip)

2. Date of Event Requiring Statement (Month/Day/Year)
04/11/2006

3. Issuer Name and Ticker or Trading Symbol
STEEL DYNAMICS INC [ STLD ]

4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director	10% Owner
X	Officer (give title below)	Other (specify below)
	Vice President

5. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)
Common Stock	13,813⁽¹⁾	D

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
1. Title of Derivative Security (Instr. 4)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)

Explanation of Responses:

1. The 13,813 shares of Steel Dynamics (SDI) common stock were received by Mr. Duke as part of the merger consideration, in exchange for 34,532 shares of Roanoke Electric Steel Corporation ("Roanoke") common stock formerly held by Mr. Duke, regarding the merger of Roanoke with and into a wholly-owned subsidiary of SDI, effective April 11, 2006. Mr. Duke's disposition of his Roanoke shares in accordance with the terms of the merger agreement was approved in advance of closing by the Roanoke board of directors, and Mr. Duke's acquisition of his SDI shares in exchange therefor, was approved in advance of closing by the board of directors and Compensation Committee of SDI, all in accordance with the requirements of the exemption described by SEC Rule 16b-3(d), as interpreted by the SEC in Skadden, Arps, Slate, Meagher & Flom LLP (January 12, 1999), from the short-swing profits rules of Section 16(b) of the Exchange Act.

Remarks:

	Timothy R. Duke	04/17/2006
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 5 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
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