Steel object, method of manufacturing the steel article and apparatus for manufacturing a steel article

According to one aspect of the present invention, a method for manufacturing a steel article by performing a heat treatment on a steel article (W), which has a high strength, provided to the hardness at a portion of the steel article to a relation to other portions of the steel article (W) to reduce lower hardness, wherein the heat treatment in which a portion having a certain depth from the surface of the steel article (W), is quickly heated by means of induction heating or direct heating of a heating process and a cooling process in which the steel component (W), is the subjected to the heating step, is rapidly cooled after a predetermined time after heating is provided, wherein in the heating process, heating temperature at the a c1 transformation point or above.