Grade 23 Titanium Round Rod The grade 23 titanium round rod is annealed and unpolished, meets American Society for Testing and Materials International ASTM F136 specifications, and has a standard tolerance. The grade 23 titanium alloy, also known as Ti 6Al-4V ELI, offers high toughness and moderate wear resistance, along with corrosion resistance, high strength, and good formability. The material has been annealed, a method of heating and cooling metal to modify its properties, such as increasing its formability and toughness or decreasing its strength, after it has been shaped. http://www.zirconiumbar.com/