LIMITED POWER OF ATTORNEY

Know all by these presents, that the undersigned hereby makes, constitutes
and appoints each of Theresa E. Wagler and Richard A. Poinsatte,
each signing singly, and with full power of substitution, as the undersigned's
true and lawful attorney-in-fact, with full power and authority as
hereinafter described for and on behalf of and in the name, place and
stead of the undersigned to:

(1) prepare, execute, acknowledge, deliver and file Forms 3, 4, and 5
(including any amendments thereto) with respect to the securities of
STEEL DYNAMICS, INC., an Indiana corporation (the "Company"), with the
United States Securities and Exchange Commission, any national securities
exchanges and the Company, as considered necessary or advisable under
Section 16(a) of the Securities Exchange Act of 1934, as amended
(the "Exchange Act"), and the rules and regulations promulgated thereunder;

(2) seek or obtain, as the undersigned's representative and on the
undersigned's behalf, information on transactions in the Company's
securities from any third party, including brokers, employee
benefit plan administrators
and trustees, and the undersigned hereby authorizes any such
person to release any such information to each of the undersigned's
attorneys-in-fact appointed by this Limited Power of Attorney and approves
and ratifies any such release of information; and

(3) do and perform any and all other acts which in the
discretion of such attorney-in-fact may be necessary or desirable for and on
behalf of the undersigned in connection with the foregoing.

The undersigned acknowledges that:

(1) this Limited Power of Attorney authorizes, but does not require,
each such attorney-in-fact to act in their discretion on
information provided to such attorney-in-fact without independent
verification of such information;

(2) any documents prepared and/or executed by any such attorney-in-fact
on behalf of the undersigned pursuant to this Limited
Power of Attorney will be in such form and will contain such information
and disclosure as such attorney-in-fact, in his or
her discretion, deems necessary or desirable;

(3) neither the Company nor any of such attorneys-in-fact assumes
(i) any liability for the undersigned's responsibility
to comply with the requirements of the Exchange Act and the rules
and regulations promulgated thereunder, (ii) any
liability of the undersigned for any failure to comply with such
requirements, or (iii) any obligation or liability
of the undersigned for profit disgorgement under Section 16(b) of
the Exchange Act; and

(4) this Limited Power of Attorney does not relieve the undersigned
from responsibility for compliance
with the undersigned's obligations under the Exchange Act, including without
limitation the reporting requirements
under Section 16 of the Exchange Act.

The undersigned hereby gives and grants each of the foregoing
attorneys-in-fact full power and authority to
do and perform any and every act and thing whatsoever requisite, necessary or
appropriate to be done in and about
the foregoing matters as fully to all intents and purposes as
the undersigned might or could do if personally present,
hereby ratifying and confirming all that each such attorney-in-fact, or
such attorney-in-fact's substitute or substitutes,
of, for and on behalf of the undersigned, shall lawfully do or
cause to be done by virtue of this Limited Power of Attorney.

This Limited Power of Attorney shall remain in full force and effect
until the undersigned is no longer required to
file Forms 3, 4 and 5 with respect to the undersigned's holdings of and
transaction in securities issued by the Company,
unless earlier revoked by the undersigned in a signed writing delivered
to each such attorney-in-fact.

IN WITNESS WHEREOF, the undersigned has caused this Limited Power of Attorney
to be executed as of this 1st day of November, 2023.

/s/ Jennifer L. Hamann

Name:  Jennifer L. Hamann
Title:  Director