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A primary purpose for the use of titanium in exhaust systems is weight reduction that improves both the vehicle performance and fuel effi ciency. Although weight savings are attractive, the oxidation resistance and strength of commercially pure titanium at elevated temperatures limit its application to certain parts or vehicles. This paper discusses the improvement of hightemperature properties of titanium with alloy modifi cations and introduces the properties of a patent-pending, low-alloyed titanium, TIMETAL ® Exhaust XT. 1

Titanium offers virtually unsurpassed resistance to crevice, pitting, and stresscorrosion cracking in seawater environments. ) is a near-alpha titanium alloy of intermediate strength, excellent toughness, and roomtemperature creep resistance designed in a U.S. Navy-sponsored titanium alloy development program for structural submarine applications. Ti-5111's desirable mechanical properties and excellent corrosion resistance render this titanium alloy an ideal fastener material from both a technical and economic perspective. J. Been is a senior corrosion engineer and K. Faller is a manager at Titanium Metals Corporation. For more information, contact J. Been, Titanium Metals Corporation, Henderson Technical Laboratory, 8000 West Lake Mead Drive, Henderson, Nevada 89015; (702) 566-4413; fax (702) 564-9038; e-mail jenny.been@timet.com.

A chance discovery is enabling significant efficiency gains in titanium conditioning, one of the most costly steps in titanium metal production.