Exhibit 99.1

Allegheny Technologies Announces Proposed

Senior Notes Offering

PITTSBURGH – (BUSINESS WIRE) — July 9, 2013 — Allegheny Technologies Incorporated (NYSE:ATI) announced today its intention to offer, subject to market and other conditions, a series of senior notes. The offering will be made pursuant to the Company’s effective shelf registration statement filed with the Securities and Exchange Commission (the “SEC”) on May 30, 2012.

ATI intends to use the net proceeds from the offering for general corporate purposes, which may include repurchases, repayment or refinancing of debt, capital expenditures, additions to working capital, the financing of future acquisitions or strategic combinations.

J.P. Morgan Securities LLC and Merrill Lynch, Pierce, Fenner & Smith Incorporated are the joint book-running managers for the offering.

This news release does not constitute an offer to sell or the solicitation of an offer to buy, nor shall there be any sale of any of the senior notes in any jurisdiction in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such jurisdiction. A registration statement relating to the senior notes has been filed with the SEC.

Copies of the prospectus and preliminary prospectus supplement meeting the requirements of Section 10 of the Securities Act of 1933, as amended, may be obtained from J.P. Morgan Securities LLC, 383 Madison Avenue, New York, New York, 10179, Attention: Investment Grade Syndicate Desk, 3rd Floor, telephone collect at 1-212-834-4533, Merrill Lynch, Pierce, Fenner & Smith Incorporated, 222 Broadway, 11th Floor, New York, NY 10038, Attention: Prospectus Department, or email: dg.prospectus_requests@baml.com, Phone: 1-800-294-1322, or from the SEC website at www.sec.gov.

Allegheny Technologies Incorporated is one of the largest and most diversified specialty metals producers in the world with revenues of approximately $4.9 billion for the last twelve months. ATI has approximately 11,100 full-time employees world-wide who use innovative technologies to offer global markets a wide range of specialty metals solutions. Our major markets are aerospace and defense, oil and gas/chemical process industry, electrical energy, medical, automotive, food equipment and appliance, machine and cutting tools, and construction and mining. Our products include titanium and titanium alloys, nickel-based alloys and superalloys, grain-oriented electrical steel, stainless and specialty steels, zirconium, hafnium, and niobium, tungsten materials, forgings, castings and fabrication and machining capabilities. The ATI website is www.ATImetals.com.

Forward Looking Statements

This news release contains “forward-looking statements” within the meaning of the Private Securities Litigation Reform Act of 1995. Certain statements in this news release relate to future events and expectations and, as such, constitute forward-looking statements. Forward-looking statements include those containing such words as “anticipates,” “believes,” “estimates,” “expects,” “would,” “should,” “will,” “will likely result,” “forecast,” “outlook,” “projects,” and similar expressions. Forward-looking statements are based on management’s current expectations and include known and unknown risks, uncertainties and other factors, many of which we are unable to predict or control, that may cause our actual results, performance or achievements to materially differ from those expressed or implied in the forward-looking statements. Important factors that could cause actual results to differ materially from those in the forward-looking statements include: (a) material adverse changes in economic or industry conditions generally, including global supply and demand conditions and prices for our specialty metals; (b) material adverse changes in the markets we serve, including the aerospace and defense, oil and gas/chemical process industry, electrical energy, medical, automotive, construction and mining, and other markets; (c) our inability to achieve the level of cost savings, productivity improvements, synergies, growth or other benefits anticipated by management, from strategic investments and the integration of acquired businesses, whether due to significant increases in energy, raw materials or employee benefits costs, project cost overruns or unanticipated costs and expenses, or other factors; (d) volatility of prices and availability of supply of the raw materials that are critical to the manufacture of our products; (e) declines in the value of our defined benefit pension plan assets or unfavorable changes in laws or regulations that govern pension plan funding; (f) significant legal proceedings or investigations adverse to us; and (g) other risk factors summarized in our Annual Report on Form 10-K for the year ended December 31, 2012, and in other reports filed with the Securities and Exchange Commission. We assume no duty to update our forward-looking statements.

Contact:

Allegheny Technologies Incorporated

Dan L. Greenfield, (412) 394-3004

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