HARDENING TREATMENT METHOD OF LOW ALLOY STEEL

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PROBLEM TO BE SOLVED : To provide a hardening treatment method capable of surface layer hardening treatment of a low alloy steel having a small content of a rare metal or not containing a rare metal. SOLUTION : In a hardening treatment method of a low alloy steel, the surface of the low alloy steel is irradiated with a plasma jet of nitrogen gas containing hydrogen gas added thereto under an atmospheric pressure to heat a surface layer of the low alloy steel to an austenitic transformation point temperature or higher, and to thereby diffuse nitrogen atoms onto the surface layer of the low alloy steel; and further, the low alloy steel is hardened to generate martensitic transformation of the surface layer of the low alloy steel, to thereby generate a nitrogen martensite phase. COPYRIGHT : (C)2014, JPO&INPIT