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                            October 29, 2021

       Theresa E. Wagler
       Chief Financial Officer
       Steel Dynamics, Inc.
       7575 West Jefferson Blvd
       Fort Wayne, IN 46804

                                                        Re: Steel Dynamics,
Inc.
                                                            Form 10-K for the
Fiscal Year Ended December 31, 2020
                                                            Response Dated
October 14, 2021
                                                            File No. 000-21719

       Dear Ms. Wagler:

              We have reviewed your October 14, 2021, response to our comment
letter and have the
       following comments. In some of our comments, we may ask you to provide
us with information
       so we may better understand your disclosure.

              Please respond to these comments within ten business days by
providing the requested
       information or advise us as soon as possible when you will respond. If
you do not believe our
       comments apply to your facts and circumstances, please tell us why in
your response.

             After reviewing your response to these comments, we may have
additional
       comments. Unless we note otherwise, our references to prior comments are
to comments in our
       September 23, 2021, letter.

       Form 10-K for the Fiscal Year Ended December 31, 2020

       Item 7
       Management's Discussion and Analysis of Financial Condition and Results
of Operations, page
       33

   1.                                                   We note your response
to prior comment 2, and reissue our comment. Your statement that
                                                        you have not
experienced any material indirect consequences of climate-related regulation
                                                        or business trends
appears to be conclusory without providing sufficient detail. Please
                                                        provide us with
additional support for your conclusion, including with regard to the
                                                        individual items noted
in our prior comment.
 Theresa E. Wagler
FirstName  LastNameTheresa E. Wagler
Steel Dynamics, Inc.
Comapany
October 29,NameSteel
            2021     Dynamics, Inc.
October
Page  2 29, 2021 Page 2
FirstName LastName
2.       Your response to prior comment 2 indicates that your products are
produced by
         technology that generates lower greenhouse gas emissions than many of
your competitors,
         yet you have not experienced significant price premiums for your
products. Please
         describe how you analyzed prices and determined whether premiums were
         significant. Please also tell us what consideration you gave to
providing disclosure
         regarding opportunities resulting from increased demand for goods that
generate lower
         greenhouse gas emissions than competing products.
3.       Your response to prior comment 3 indicates that you have not
experienced any material
         weather-related damages to your property or operations, or a lack of
availability or
         material increase in your insurance programs. Please provide
information in support of
         your conclusions. Describe the weather-related damages you have
experienced and the
         impact on your business, financial condition, and results of
operations. Explain how you
         analyzed materiality and, to the extent you quantified amounts such as
weather-related
         damages and/or changes in the cost or availability of insurance,
please provide us with
         your quantification analysis.
       Please contact Jennifer Angelini at 202-551-3047 or Sergio Chinos at
202-551-7844 with
any questions.



                                                             Sincerely,

                                                             Division of
Corporation Finance
                                                             Office of
Manufacturing