Because of its excellent physical properties of titanium: Small density, light weight, small coefficient of thermal expansion, no magnetism, high resistivity, low thermal conductivity, good mechanical properties: High temperature resistance, metal fatigue, good toughness, high mechanical strength, Chemical properties: Corrosion resistance, oxidation resistance, non-toxic, antibacterial, good biological activity, so titanium is also called "third metal". The titanium is used as raw material for the production of nuts, also known as titanium screws, titanium screws have inherited the excellent characteristics of titanium.

Because the ship voyages in the sea for a long time, the sea itself is a kind of strong corrosive medium, at the same time, wave, tidal flow, will produce low frequency reciprocating stress and impact on the metal components, and the ocean microorganism, fouling organisms and their metabolites have accelerated the corrosion process directly or indirectly. Therefore, it is very easy to produce corrosion of metal components in seawater environment, especially for some metal structures. In order to improve the service life of metal structure, the usage and utilization rate of titanium screws are higher and higher. The structure parts made of titanium screws can not only improve the corrosion resistance, but also greatly extend the service life of the ship, in particular to the trouble of frequent replacement. Therefore, the application of titanium screws is known as a major revolution in the shipbuilding industry.