Haynes International (HAYN) 10-K 2014 FY Annual report

QuickLinks -- Click here to rapidly navigate through this document

Exhibit 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

        We consent to the incorporation by reference in Registration Statement No. 333-14599 and No. 333-134989 on Form S-8 of our report dated November 20, 2014, relating to the financial statements of Haynes International, Inc. and the effectiveness of Haynes International, Inc.'s internal control over financial reporting, appearing in this Annual Report on Form 10-K of Haynes International, Inc. for the year ended September 30, 2014.

/s/ DELOITTE & TOUCHE LLP

Indianapolis, IN
November 20, 2014

QuickLinks

Exhibit 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM