1.Alpha alloy contains a certain amount of stable alpha phase elements, under the equilibrium state, it is mainly composed of the alpha phase. Alpha alloy has low specific gravity, good heat strength, good welding performance and excellent corrosion resistance. The disadvantage is that the room temperature strength is low, and it is usually used as heat resistant material and corrosion resistant material. The alpha alloy can also be divided into full - alpha alloy (TA7), near - alpha alloy (Ti-8Al-1Mo-1V) and a small amount of compound - alpha alloy (Ti-2.5Cu).

2.Beta alloy contains a large number of stable beta phase elements, the high temperature beta phase can be retained into room temperature. Beta alloys are generally classified as heat treated beta alloys (metastable beta alloys and nearly metastable beta alloys) and thermally stable beta alloys. In the quenching process, the heat treatment of the beta alloy has excellent plasticity, and the tensile strength can be reached to 130 ~ 140kgf/mm2. by aging treatment. Beta alloys are usually used as high strength and high toughness materials, and the disadvantages are that it has high cost, poor welding performance and difficult machining.

3.(alpha + beta) alloy contains a certain amount of stable alpha phase and beta phase elements, and under the equilibrium state, the microstructure of the alloy is alpha phase and beta phase. (alpha + beta) alloy has moderate intensity, and can heat treatment to strengthen, but it has poor welding performance. (alpha + beta) alloy is widely used, in which the yield of Ti-6Al-4V alloy in all titanium materials accounted for more than half.

Titanium bar manufacturers data show that titanium is an important structural metal developed in 1950s, titanium alloy has been widely used in various fields because of its high specific strength, good corrosion resistance, high heat resistance and so on. Many countries in the world recognize the importance of titanium alloy materials, the research and development have been carried out, and have been applied in practice. Titanium is the fourth type B elements in the periodic table, its appearance is similar with steel, its melting point is 1672 degrees Celsius, which is called refractory metal. Titanium content is rich in the earth's crust, which is much higher than Cu, Zn, Sn, Pb and other common metals. Titanium alloy can be divided into heat resistant alloy, high strength alloy, corrosion resistant alloy (titanium - molybdenum, titanium - palladium alloy, etc.), low temperature alloy and special function alloys (titanium - iron hydrogen storage materials and titanium nickel memory alloy).