METHOD FOR QUENCHING STEEL COMPONENT

To provide a method for quenching a steel component by which a cooling rate of an object to be treated can be made uniform, by supplying a sufficient flow of the oil in the vicinity of the center of an upper portion of a basket even when the filling amount of the object to be treated (steel component) is large, and preventing the flow velocity of the oil from increasing around the steel component so that the oil avoids the steel component.SOLUTION: A quenching system includes a quenching tank 1 that stores oil, stirring means that stirs the oil in the quenching tank 1, and steel component moving means that moves a steel component W in the quenching tank 1. In the quenching method using the quenching system, the steel component W is quenched while covering the upper side of the steel component W by using a top plate T having an opening portion 2.SELECTED DRAWING: Figure 2 【課題】被処理物（鋼製部品）の充填量が多い場合でもカゴ上部の中央付近に必要十分な油の流れを供給して、かつ油が鋼製部品を避けるように鋼製部品の周囲で流速が高くなることを抑制できて、被処理物の冷却速度を均一にできる鋼製部品の焼入方法を提供する。【解決手段】油を貯留する焼入槽１と、焼入槽１内の油を撹拌する撹拌手段と、鋼製部品Ｗを焼入槽１内で移動させる鋼製部品移動手段と、を備えた焼入装置を用いた焼入方法において、開口部２を有する天板Ｔを用いて鋼製部品Ｗの上方を覆いながら鋼製部品Ｗの焼入処理を行う。【選択図】図２