Hexagonal flange concave brain with pad purple titanium bolt for automobile.
Titanium has metallic luster and ductility. The density is 4.5g/cm3. The melting point is 1668°C. The boiling point is 3287°C. Common valences +2, +3 and +4. The ionization energy is 6.82 eV. The main characteristics of titanium are low density, high mechanical strength, and easy processing. The plasticity of titanium mainly depends on purity. The purer the titanium, the greater the plasticity. It has good corrosion resistance and is not affected by the atmosphere and sea water. At room temperature, it will not be corroded by hydrochloric acid below 7%, sulfuric acid below 5%, nitric acid, aqua regia or dilute alkali solution; only hydrofluoric acid, concentrated hydrochloric acid, concentrated sulfuric acid, etc. can act on it.
Titanium is an important alloying element in steel and alloys. The density of titanium is 4.506-4.516 g/cc (20°C), which is higher than aluminum but lower than iron, copper, and nickel. But the specific strength is at the top of the metal.  The melting point is 1668°C, the latent heat of fusion is 3.7-5.0 kcal/gram atom, the boiling point is 3260±20°C, the latent heat of vaporization is 102.5-112.5 kcal/gram atom, the critical temperature is 4350°C, and the critical pressure is 1130 atmospheres. Titanium has poor thermal and electrical conductivity, which is similar to or slightly lower than that of stainless steel. Titanium has superconductivity. The superconducting critical temperature of pure titanium is 0.38-0.4K. At 25°C, the heat capacity of titanium is 0.126 cal/gram atom·degree, the enthalpy is 1149 cal/gram atom, and the entropy is 7.33 cal/gram atom·degree. Titanium is a paramagnetic substance with a magnetic permeability of 1.00004.
The properties of titanium have an extremely close relationship with temperature, its existence form and purity. The dense metallic titanium is quite stable in nature, but powdered titanium can cause spontaneous combustion in the air. The presence of impurities in titanium significantly affects the physical, chemical, mechanical, and corrosion resistance of titanium. Especially some interstitial impurities, they can distort the titanium lattice and affect the various properties of titanium.
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