By studying the normalizing process system of 8620 steel, it can be seen the isothermal and air cooling time of the normalizing process will impact on the final structure and properties. The quality of the structure also directly affects the performance of the sample. The grain boundaries are not clear. It is known from experiments that the microstructure transformation is incomplete because the isothermal time in the isothermal furnace is not long enough.
The Ni content in the 8620 steel is half that of the 20CrNi steel. The addition of a small amount of Mo causes the upper part of the austenite isothermal transformation curve to move to the right. And because the Mn content is appropriately increased. The hardenability of this steel is still good and the strength also higher than 20CrNi steel. Commonly used in the manufacture of small and medium-sized cars, tractor engines and gears in transmission systems. It can also replace 12CrNi3 steel to manufacture carburized and cyanide parts that require high core performance. Such as roller drill bits for oil drilling and metallurgical surface mines tooth claw and cone body. 8620 steel because of containing molybdenum, in addition to having a good comprehensive performance. It can withstand a certain temperature. Forged gears and rotors of internal combustion engines for steam turbines.
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