Three intensive quenching processes known as IQ-1, IQ-2, and IQ-3 are considered. In contrast to IQ-2 and IQ-3, processes that use water as a quenchant, the two-step IQ-1 technique is actually a combination of a conventional quench (in oil or polymer/water solution) as the first step, followed by intensive quenching in water (the second step). Similar to the IQ-2 and IQ-3 methods, the IQ-1 process provides residual surface compressive stresses, optimum hardened depth, and additional strengthening (superstrengthening) of the material. A database and a method of calculating the IQ-1 process parameters are considered. The authors underlined that IQ processes are green environmentally friendly methods that significantly reduce CO2 emissions and energy consumption. Also examples of the use of IQ-2 and IQ-3 methods for quenching different kinds of steel parts (such as shafts, pinions, crosses, etc.) are provided. It is shown that the IQ technology's rapid and uniform cooling rates increase service life of steel parts due to the creation of high residual compressive stresses at the surface of steel parts and due to additional strengthening (superstrengthening) of the material.