|発明の名称||HARDENING TREATMENT METHOD OF METAL|
PROBLEM TO BE SOLVED: To provide an inexpensive treatment method capable of hardening metal surface easily with high quality.
SOLUTION: The hardening treatment method of metal primarily comprises: a step of preparing a melting bath in which borax and aluminum are molten; a step of immersing a metal member into the melting bath; and a step of taking out the metal member from the melting bath and cooling the metal member under water and, as necessary, comprises a step of performing boiling processing under water of the metal member after cooling or a step of performing the heating diffusion processing to the metal member subjected to the boiling processing under water. According to the treatment method, extremely high hardness can be imparted to the metal member and the hardening processing can be performed in a short time by using borate as an inexpensive boron source.
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