Case hardening steel material with little heat-treatment strain
A steel and area technology, applied in heat treatment furnaces, heat treatment equipment, metal material coating processes, etc., can solve problems such as inability to achieve, and achieve the effects of less vibration, high dimensional accuracy, and excellent fatigue properties
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[0056] In this specification, the present invention will be described mainly for application to gears, but the case-hardened steel material of the present invention is not limited to application to gears, and can be applied to mechanical parts whose surface layers are hardened by the above-mentioned quenching treatment. , especially mechanical parts that are strictly required to reduce the amount of strain after carburizing and nitriding quenching.
[0057] As described above, in order to solve the problems of the present invention and achieve the object of the present invention, the present inventors first carefully investigated the factors affecting heat treatment strain. As a result, it was found that in the macrostructure (solidified structure) of the cross section of the steel material, the following (a), (b), (c), etc. greatly affect the heat treatment strain:
[0058] (a) Decrease in C concentration;
[0059] (b) the area and area ratio of the equiaxed domains where th...
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