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Form 10-Q UNITED STATES STEEL CORP For: Sep 30

October 30, 2020 12:38 PM
Exhibit 31.1
CHIEF EXECUTIVE OFFICER CERTIFICATION
I, David B. Burritt, certify that:
1.I have reviewed this quarterly report on Form 10-Q of United States Steel Corporation;
2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;
3.Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;
4.The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:
a)    Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;
b)    Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;
c)    Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and
d)    Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and
5.The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):
a)    All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and
b)    Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.
October 30, 2020
/s/ David B. Burritt
David B. Burritt
President and Chief Executive Officer

Exhibit 31.2
CHIEF FINANCIAL OFFICER CERTIFICATION
I, Christine S. Breves, certify that:
1.I have reviewed this quarterly report on Form 10-Q of United States Steel Corporation;
2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;
3.Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;
4.The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:
a)    Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;
b)    Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;
c)    Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and
d)    Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and
5.The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):
a)    All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and
b)    Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.
October 30, 2020
/s/ Christine S. Breves
Christine S. Breves
Senior Vice President and Chief Financial Officer

Exhibit 32.1
CHIEF EXECUTIVE OFFICER
CERTIFICATION PURSUANT TO
18 U.S.C. SECTION 1350

I, David B. Burritt, President and Chief Executive Officer of United States Steel Corporation, certify that:
(1)The Quarterly Report on Form 10-Q of United States Steel Corporation for the period ending September 30, 2020, fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934; and
(2)The information contained in the foregoing report fairly presents, in all material respects, the financial condition and results of operations of United States Steel Corporation.

/s/ David B. Burritt
David B. Burritt
President and Chief Executive Officer
October 30, 2020
A signed original of this written statement required by Section 906 of the Sarbanes-Oxley Act of 2002 has been provided to United States Steel Corporation and will be retained by United States Steel Corporation and furnished to the Securities and Exchange Commission or its staff upon request.

Exhibit 32.2
CHIEF FINANCIAL OFFICER
CERTIFICATION PURSUANT TO
18 U.S.C. SECTION 1350

I, Christine S. Breves, Senior Vice President and Chief Financial Officer of United States Steel Corporation, certify that:
(1)The Quarterly Report on Form 10-Q of United States Steel Corporation for the period ending September 30, 2020, fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934; and
(2)The information contained in the foregoing report fairly presents, in all material respects, the financial condition and results of operations of United States Steel Corporation.

/s/ Christine S. Breves
Christine S. Breves
Senior Vice President and Chief Financial Officer
October 30, 2020
A signed original of this written statement required by Section 906 of the Sarbanes-Oxley Act of 2002 has been provided to United States Steel Corporation and will be retained by United States Steel Corporation and furnished to the Securities and Exchange Commission or its staff upon request.

Exhibit 95
United States Steel Corporation
Mine Safety Disclosure
(Unaudited)
For the quarter ended September 30, 2020
 
Mine (Federal Mine Safety and
Health Administration (MSHA) ID)
Total # of
Significant &
Substantial
violations
under 
§104(a) (a)
Total # of
orders
under
§104(b) (a)
Total # of
unwarrantable
failure
citations and
orders under
§104(d)
(a)
Total # of
violations
under
§110(b)(2) (a)
Total # of
orders
under
§107(a) (a)
Total dollar
value of
proposed
assessments
from
MSHA
Total # of
mining
related
fatalities
Received
Notice of
Pattern of
Violations
under
§104(e) (a)
(yes/no)?
Received Notice
of Potential to
have Pattern
under
§104(e) (a)
(yes/no)?
Total # of Legal
Actions Pending
with the Mine
Safety and
Health Review
Commission as
of Last Day of
Period
(b)
Legal
Actions
Initiated
During
Period
Legal
Actions
Resolved
During
Period
Mt. Iron
(2100820, 2100282)
— $—nono657343
Keewatin
(2103352)
— $—nono3615
 
(a)References to Section numbers are to sections of the Federal Mine Safety and Health Act of 1977.
(b)Includes all legal actions pending before the Federal Mine Safety and Health Review Commission, together with the Administrative Law Judges thereof, for each of our iron ore operations. These actions may have been initiated in prior quarters. All of the legal actions were initiated by us to contest citations, orders or proposed assessments issued by the Federal Mine Safety and Health administration, and if we are successful, may result in the reduction or dismissal of those citations, orders or assessments. As of the last day of the period, all 101 legal actions were to contest citations and proposed assessments.

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