EXHIBIT 23.1 INDEPENDENT AUDITOR'S CONSENT We consent to the incorporation by reference in this Registration Statement of Armco Inc. on Form S-4 of our reports dated February 5, 1997, incorporated by reference in the Annual Report on Form 10-K of Armco Inc. for the year ended December 31, 1996 and to the reference to us under the heading "Experts" in the Prospectus, which is a part of this Registration Statement. /s/ Deloitte & Touche LLP Pittsburgh, Pennsylvania September 30, 1997