Gr5 is a titanium alloy. Gr5 is the board designation of the Association of Materials and Materials for the specified titanium alloy.

Titanium has a density of 4.506-4.516 grams per cubic centimeter (20 ° C), higher than aluminum and lower than iron, copper and nickel. The strength of the first metal, stainless steel is 3 times, 1.3 times that of aluminum.

Titanium is an important structural metal, titanium alloy has been widely used in various fields because of its high strength, good corrosion resistance, high heat resistance and other characteristics. Many countries in the world recognize the importance of titanium alloy materials, have been carried out research and development, and has been the practical application. Titanium alloy is mainly used for making aircraft engine compressor components, followed by the rocket, missile and high-speed aircraft structural parts.