A friend of mine has several patents for cryogenic technology he has developed and markets and installs his equipment all over the world, He started in the business treating metal for military applications,
There is much more to it than dipping stuff in liquid nitrogen. Metals are subjected to cooling in phases until the desired temperature (-360 f) for the metal being treated is reached, then the temp is maintained for a precise amount of time before being brought back to normal temperature, again slowly raising it incrementally,
The process actually changes the molecular structure of the metal., binding the larger molecules to each other and likewise the smaller molecules to each other .
There is a breakthrough on the horizon with a new technology that would use cryogenic systems to super cool CNG for use in railroad engines and over the road trucks as well as ocean freighters, using a newly developed dual nozzle injector, large displacement industrial diesel engines could be converted to use this super cooled CNG as an maximizing agent when injected into the combustion chamber milliseconds after the diesel, reducing the amount of diesel required for the same torque (or much more), The application primary goal being to reduce carbon emissions from railroads and large ships, converting in service equipment to this new technology.