In the field of ships, the main application of titanium alloy pressure shells is deep submersible vehicles and submarines. 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 pressure shells for deep-sea equipment.
Russia is the first country to use titanium alloy pressure shells on nuclear submarines, and is also the world's technology leader. Beginning in the 1960s, Russia (the former Soviet Union) produced a series of titanium alloy submarines. Initially, Russia built the 661 titanium alloy cruise missile nuclear submarine, which is a test ship. Later, Russia successively manufactured seven "Alpha" class titanium alloy submarines, one "Mike" class submarine, and four "Sierra" class submarines. These nuclear submarines are attack type, of which the "Alpha" class titanium alloy submarine titanium alloy makes the amount of 3000t. The Russian-made "Typhoon" class nuclear submarine is the world's largest submarine in terms of volume and tonnage, and its titanium amount reaches 9000t.
At present, Russia's latest generation of "God of the North Wind" class nuclear submarines also use titanium alloy pressure shells.
Another important application of titanium alloy pressure shells is deep submersible vehicles. Jiaolong manned submersible is a manned submersible independently developed by China, with a maximum diving depth of more than 7,000 meters. The submersible's pressure casing is made of titanium alloy. At present, most of the world's major large depth manned submersibles choose titanium alloy material as the preparation material of pressure shell. For example, the shell material of the United States' Alvin and NewAlvin, China's "Jiaolong", France's Nautile, Japan's Shinkai6500 and other large depth manned submersives are all titanium alloy [9]. Titanium alloy has become the preferred material for the pressure hull of deep-sea submersible.
