For most boats and ships, they often face with many force majeure of natural factors when they sail in the sea. How to ensure ships to sail smoothly and safely is the most important issue for the all voyagers. Especially for cargo ships, when a cargo ship, full with cargo and discharged cargo after arriving destination port, its hull would be lighter, if it sails at this time, it will increase the risks of tipping. So, every boat should be equipped with ballast tanks, for storing ballast weights. An appropriate amount of ballast weights can ensure the propellers of ships to draft adequately, reduce the hull vibration to a minimum degree, and sustain propulsion efficiency and ensure stable and safe operation of the ship in the voyaging journey.

 

In addition, the ballast weights can also keep the time of shear force and tilting maintained of the ship within a safe range in the sailing process. Ballast weights are usually sand, stones or water, but injecting seawater as ballast weights would be likely to cause the invasion of adventitious species, such examples are not uncommon. With the development of international trade and economic globalization, about 80 percent of cargo is transported by ships, while the global approximately 10 billion tons of ballast water discharged in the strange port per year. The red tide caused in China's coastal side is due to the ballast water, which brings the adventitious species.

 

How to ensure the safety of ships sailing without causing marine environment pollution, the essential problem is to select the ballast materials. With a variety of metal materials continue to be discovered and utilized, this new type of high density tungsten alloy material has become the most popular current ballast material due to its small volume density and some other advantages.