Application of titanium alloy in Marine field
The corrosion resistance of titanium alloy material is widely used in ships, not only in large equipment such as ship manufacturing and cabin facilities, but also in other parts and components, such as electronic information system, power system, auxiliary system, hull structural parts,propulsion system, etc. Foreign titanium alloy materials are mainly used in ship structure, propulsion equipment, acoustic equipment and so on.
No.1 Pressure housing
In the field of ships, the main application of titanium alloy pressure hull is deep submarine and submarine. Titanium alloy has the characteristics of high specific strength, good corrosion resistance and non-magnetism, which make it a high-quality material for the manufacture of deep-sea equipment pressure shell.
Russia is the first country to use titanium alloy pressure hull on nuclear submarines, and is also the world leader in technology. Starting in the 1960s, Russia (formerly the Soviet Union) built a series of titanium submarines. It started with the 661 titanium alloy cruise missile nuclear submarine. Subsequently, seven Alpha class titanium alloy submarines, one MAC class submarine, and four Sierra class submarines were built. These nuclear submarines are attack type, of which "Alpha" class titanium alloy submarines use up to 3000 tons of titanium alloy. The Typhoon-class nuclear submarine made by Russia is the world's largest submarine in terms of volume and tonnage, and it uses 9000 tons of titanium. Currently, the latest generation of Russia's North Wind class nuclear submarines also use titanium alloy pressure hull.
No.2 Power propulsion unit
Due to the influence of sea water and ocean climate, ship propeller materials need high corrosion fatigue strength and cavitation corrosion resistance. Compared with copper alloy and steel, titanium alloy has advantages in corrosion fatigue strength and cavitation resistance. In addition, because of its low density, titanium propellers have a small mass compared to other commonly used materials when making propellers of the same size. As a result, ships with titanium propellers are driven more efficiently.
Ross, Britain and others have been trying to use titanium propellers on ships since the 1960s. Russia, for example, uses titanium propellers in its Alpha-class and Mi-class nuclear submarines. The United States has also used titanium propellers on several ships.
No.3 Acoustic device
Titanium alloys can also be used for acoustic devices on ships, such as sonar hoods, underwater acoustic energy exchangers, microphones, telephone parts, etc. Sonar is the most effective equipment for underwater target detection. Stainless steel and fiber reinforced glass steel, compared with titanium alloy materials, have relatively weak sound transmission and crashworthiness. Russia has applied titanium alloy sonar deflector to "Kursk" nuclear submarine, "Minsk" aircraft carrier, "Kyiv" aircraft carrier, etc., and the actual sonar detection effect is good.