It is shown in the paper that during quenching metal samples in liquid media, such as water salt solutions, nanofluids and low concentration of water polymer solutions, the main attention should be paid to critical heat flux densities and convective heat transfer coefficients which should be combined with the self – regulated thermal process (SRTP). No one can affect duration or intensity of cooling during transient nucleate boiling by adding any additives or nanoparticles to a liquid because nucleate boiling process by itself is very intensive due to acting thousands of vapor bubbles with the high frequency and intense liquid vaporization. Only two options are left which can affect cardinally cooling process via maximizing critical heat flux densities and increasing convective heat transfer coefficients. When any film boiling during quenching in still water or water solutions is completely absent, process of cooling is intensive due to intense acting thousands of vapor bubbles during nucleate boiling. These conclusions are very important for investigators who are focused on development intensive low temperature thermo-mechanical and cryogenic treatment of materials. The ideas discussed in this paper can be useful for engineers, scientists and students.