Several advantages of titanium screws and their materials: 　　

       Low density and high specific strength: The density of metal titanium is 4.51g/cm3, which is higher than aluminum but lower than steel, copper, and nickel, but its specific strength is at the top of the metal.

　　 Corrosion resistance: Titanium is a very active metal, its equilibrium potential is very low, and the thermodynamic corrosion tendency in the medium is large. But in fact, titanium is very stable in many media. For example, titanium is corrosion-resistant in oxidizing, neutral and weakly reducing media.

　　Good heat resistance: the new titanium alloy can be used for a long time at 600℃ or higher.

Good low-temperature resistance: low-temperature titanium alloys represented by titanium alloy TA7 (Ti-5Al-2.5Sn), TC4 (Ti-6Al-4V) and Ti-2.5Zr-1.5Mo, whose strength increases with decreasing temperature, But the plastic change is not big. It maintains good ductility and toughness at low temperatures of -196-253℃, avoids cold brittleness of metals, and is an ideal material for cryogenic containers, storage tanks and other equipment.

Strong resistance to damping: Titanium has the longest vibration decay time compared with steel and copper after being subjected to mechanical and electrical vibrations.

　　Non-magnetic and non-toxic: Titanium is a non-magnetic metal, and it will not be magnetized in a large magnetic field. It is non-toxic and has good compatibility with human tissues and blood, so it is adopted by the medical profession.

　　 The tensile strength is close to its yield strength: This property of titanium shows that its yield ratio (tensile strength/yield strength) is high, and it means that the metal titanium material has poor plastic deformation during forming. Due to the large ratio of the yield limit of titanium to the modulus of elasticity, the resilience of titanium during molding is large.

Good heat transfer performance: Although the thermal conductivity of metallic titanium is lower than that of carbon steel and copper, due to the excellent corrosion resistance of titanium, the wall thickness can be greatly reduced, and the heat exchange method between the surface and the steam is dropwise condensation, which reduces The heat group can reduce the thermal resistance without fouling on the surface, so that the heat transfer performance of titanium is significantly improved.

　　 Low modulus of elasticity: The modulus of elasticity of titanium is 106.4GMPa at room temperature, which is 57% of that of steel.

　　 Absorption performance: Titanium screw is a kind of metal with very active chemical properties, which can react with many elements and compounds at high temperature. Titanium getter mainly refers to the reaction with carbon, hydrogen, nitrogen, and oxygen at high temperatures.