GR9 titanium alloy is a kind of titanium alloy, also known as titanium alloy Ti-3Al-2.5V, which contains more than 99.7% pure titanium, 3% Al element, and 2.5% V element, his strength is higher than GR5 titanium alloy (Ti-6Al-4V),GR9 titanium alloy hardness, light weight, corrosion resistance, in titanium alloy types, High hardness and strength. Therefore, it is widely used in aerospace, automobile and bicycle, medical and other industries.