ATI Ti-5Al-2Sn-2Zr-4Cr-4Mo Alloy (UNS R58650), also known as Ti-17, was developed by General Electric as a high strength, deep hardening alloy for fan and compressor discs and for other large components. It has been classified as a "beta-rich" alpha-beta alloy. The alloy may be processed in the beta region, or in the alpha plus beta region. This Ti-17 alloy has higher tensile and creep strengths than Ti-6Al-4V. While its hardenability is similar to other beta alloys, ATI 17™ Alloy has a lower density and a higher modulus than most other beta titanium alloys.

ATI 17™ Alloy is normally produced by plasma cold hearth melting (PAM), and is followed by vacuum arc remelting (VAR). The alloy is normally supplied as forging billet, but it may also be supplied as forged or rolled bar.