China's first 4500 meters manned submersible manned spherical shell, in the Chinese heavy industry 725 factory.

It is understood that the factory of the spherical shell with the Jiao long spherical shell size, diameter of 2.1 meters, and used the same technology path, the process is a bit like "slice and watermelon", namely the split with thick plate stamping forming, and then points disc assembly, welding into the ball. Viewed from the outside, much more than the Jiao long two observation windows increased from 3 to 5, the big difference is that the use of our self-developed Ti80 titanium alloy materials.

Ti80 is developed on the basis of deep submergence is used nearly alpha titanium alloy, with moderate intensity, Gao Ren, corrosion resistance, good weld ability, such as performance, has been widely used in Marine areas. Manned space manned submersible spherical shell is 4500 meters is the most important core component, is 4500 meters manned submersible key equipment localization of the most important link.