Why is titanium alloy so suitable for submarines? What are its advantages?

With the development of naval equipment, the requirements for naval equipment are getting higher and higher, and traditional steel, iron, aluminum, magnesium and other metals and their alloys can no longer meet the requirements in many fields. Titanium alloys are receiving increasing attention from ships and marine engineering equipment due to their excellent properties and are called "marine metals". As the core of "naval equipment", submarines are the backbone of strategic nuclear forces and play a pivotal role. Can the use of titanium alloys to make submarines bring new breakthroughs in performance to submarines?

Specific strength refers to the ratio of material strength to density. The greater the specific strength, the smaller the structural weight can be obtained with the same strength design, and the higher the strength can be obtained with the same structural quality. The high specific strength can make the equipment design more compact, greatly reduce the structural quality, and improve the safety of the equipment.

The effect of high specific strength on pressure shell

When the submarine structure is timed, the submarine's ultimate diving depth is proportional to the product of the yield strength of the shell material and the shell thickness. Increasing the diving depth by thickening the pressure shell will reduce the effective load of the submarine. If the effective load is maintained, the size of the submarine will be increased to the extent that it cannot be used, thereby reducing the overall performance of the submarine. Therefore, we must consider the use of higher specific strength materials.

Although the yield strength of titanium alloy is not as good as that of high-strength steel, it has a lower density and higher specific strength. It is the best among several materials currently available for submarine shells. Therefore, titanium alloy is used for submarine and deep submersible The pressure shell material is very advantageous.

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