Attached files

file filename
EX-32.1 - EX-32.1 - ALLEGHENY TECHNOLOGIES INCfy202010-k321.htm
10-K - 10-K - ALLEGHENY TECHNOLOGIES INCati-20201231.htm
EX-31.2 - EX-31.2 - ALLEGHENY TECHNOLOGIES INCfy202010-k312.htm
EX-31.1 - EX-31.1 - ALLEGHENY TECHNOLOGIES INCfy202010-k311.htm
EX-21.1 - EX-21.1 - ALLEGHENY TECHNOLOGIES INCfy202010k211.htm
EX-10.17 - EX-10.17 - ALLEGHENY TECHNOLOGIES INCfy202010k1017.htm
EX-10.16 - EX-10.16 - ALLEGHENY TECHNOLOGIES INCfy202010k1016.htm

Exhibit 23.1
Consent of Independent Registered Public Accounting Firm

We consent to the incorporation by reference in the following Registration Statements:
(1)Registration Statements (Form S-3 No. 333-224542) of Allegheny Technologies Incorporated, and
(2)Registration Statements (Form S-8 Nos. 333-238169, 333-203784, 333-217942, 333-188641, 333-145651, 333-59161, 333-10229, and 333-45965) pertaining to the employee benefit plans of Allegheny Technologies Incorporated;
of our reports dated February 26, 2021, with respect to the consolidated financial statements of Allegheny Technologies Incorporated and Subsidiaries and the effectiveness of internal control over financial reporting of Allegheny Technologies Incorporated and Subsidiaries included in this Annual Report (Form 10-K) of Allegheny Technologies Incorporated and Subsidiaries for the year ended December 31, 2020.

/s/ Ernst & Young LLP
Pittsburgh, Pennsylvania
February 26, 2021