For titanium alloy has higher specific strength, more excellent corrosion resistant performance and present a greater development potential in ship applications. A, in the application of the ship structure. Titanium and titanium alloy while the yield strength is high, but in need of inert gas protection welding, molding difficulty is greater than steel. So general rarely use titanium surface ship structure. Titanium and titanium alloy is mainly used for submarines, DSV ships, to meet at the same time on the yield strength, density and requiring high corrosion resistance. Second, the cooler used for ships. Because the titanium and titanium alloy in seawater has more excellent than other alloy corrosion resistant performance, compared with the commonly used copper alloy and high strength, low density, can increase the water flow velocity through the thin wall thickness reduction and to ensure that the heat transfer efficiency.