Trends in Heat Treatment Technology for Bearing Steel

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  • 軸受鋼の熱処理技術動向
  • ジクウケコウ ノ ネツ ショリ ギジュツ ドウコウ

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Abstract

<p>Since rolling bearing materials are subjected to repeated contact pressure of several GPa, heat treatment is applied to obtain a hardness that can bear such pressure. SUJ2 is the most widely used steel for rolling bearings, and it is heat treated under conditions that maximize the sub-surface initiated flaking life. In recent years, dent-initiated flaking life is getting more important, and for this purpose, carbonitriding and/or grain refinement is applied. Carbonitriding treatment has also been found to be effective against the failure due to hydrogen embrittlement. Heat treatment is a process that has a high environmental load, thus change to a high-efficiency heating source such as induction heating is being considered. In the case of induction heating, the conditions of higher temperature and short time than the case of furnace is employed. The appropriate heating conditions that can obtain the mechanical properties equivalent to those of the bearings heated in the furnace have been found.</p>

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