Application of titanium plate in ship industry
The application of titanium plate in the shipbuilding industry mainly uses its excellent corrosion resistance, as well as low density, memory and non-magnetism. Titanium and titanium alloys are widely used in nuclear submarines, deep submersibles, atomic energy icebreakers, hydrofoil ships, hovercraft, minesweepers, propeller propellers, whip antennas, seawater pipelines, condensers, heat exchangers, acoustic devices, fire fighting equipment, etc. The main titanium alloys used are: industrial pure titanium, Ti-SARV, Ti-6A1-4VELKTi-6Al-2Nb-Ta-0.8Mo, Ti-3Al-2.5V, Ti-3B (Ti-4A1-2V), nT-7M (Ti-2Al-2.5Zr).
(1) Propeller. Propeller materials require high strength, good fatigue performance in seawater medium, erosion resistance and cavitation corrosion resistance. Titanium alloy can meet the above comprehensive performance requirements. The U.S. Navy first used a 1500mm diameter, four-blade detachable supercavitating titanium alloy propeller on hydrofoil boats. China developed a hydrofoil speedboat propeller in 1972. Up to now, it has produced various types of titanium alloy propellers with a diameter of 450-1700mm. M can produce fixed titanium alloy propellers with a diameter of 1200mm and a mass of 130kg. Long-term use shows that the service life of titanium alloy propellers is more than five times that of copper alloy propellers
2) Ship pumps, valves and piping. The pump, valve and pipe of the ship h have a service life of only 2-5 years because of the very bad working conditions. The pipes made of copper and stainless steel have a good effect after replacement. They are suitable for the dynamic seawater pipes with high flow rate. The service life standard of ship pipelines in Russia stipulates three service life requirements, that is, the period of the first docking repair is 8-9 years; The service life shall not be less than 15 years; The whole life requires that all classes of ships should operate reliably in 25-30 years.
(3) All-titanium ship, F1 has good practical experience in manufacturing titanium ships. In the 1990s, some foreign titanium plate manufacturers have built all-titanium fishing boats or speedboats. The advantages of all-titanium ship are light weight and fast speed: small engine and low fuel cost; The emission of carbon monoxide is small, and it is easy to clean the attachments without surface coating. The disadvantages are high material cost, difficult processing and manufacturing technology, and strict protection requirements. The ship test results show that the ship speed stability, vibration and noise are very good.
4) Atomic power ship: Russia uses titanium alloy instead of stainless steel to make ship's steam engine, heat exchanger and cooler, which overcomes the corrosion damage to the power plant of Russia's existing atomic power icebreaker. Titanium steam engine is widely used. The use of titanium alloy can prolong the service life of its engine by more than 10 times.
