According to the metastable state, titanium alloys can be divided into: α type, similar α type, α+β type, similar β type, metastable β type and β type titanium alloy, according to the annealing characteristics can be divided into: α type, α+ Beta type, beta titanium alloy.   1.α-type titanium alloy: low density, annealing heat treatment, good thermal strength and thermal stability, good welding performance, good room temperature, ultra-low temperature and high temperature performance, etc 2.α+β type titanium alloy: can be strengthened by heat treatment, strength and hardenability increase with the increase of β-stabilizing element, good weldability, TC4ELI alloy has good ultra-low temperature toughness, β-processed Gr.5ELI alloy has good capacity. limited performance. 3.β-type titanium alloy: It has the characteristics of low room temperature strength, cold forming ability and strong cold working ability, good corrosion resistance in reducing medium, thermal stability and good weldability.   Titanium and titanium alloys have low density and high tensile strength, up to 1400MPa. In the range of -253-600 degrees Celsius, its tensile strength/density is the highest among metal materials.      

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