特殊環境用軸受鋼の開発

概要

論文の詳細を見る
Recent improvements in the quality of steels have meant that rolling bearings are largely free from materials defects. Therefore, damage generated during the operating life of the component becomes the main source of failure. This damage is frequently caused by overheating at a higher speed operation or by the overrolling of debris paricles in the lubricant. A new bearing steel, named STJ2, for high temperature service was developed in the view of supressing rolling contact fatigue phenomenon, which is accelerated by the heat occur at raceway. STJ2 showed a longer life than cnventional JIS-SUJ2 steel in a bearing test at 473K, and have been applied to spherical roller bearings produced by NTN Corp. Another bearing grade for contaminated lubricant service was designed with the control of retained austenite in a steel. Adequate amount of retained austenite that prolonged the rolling contact fatigue life under a contaminated lubricant was obtained by the addition of manganese more than 2 mass%. This new steel has just been begun to introduce to domestic and foreign bearing manufacturers.
電気製鋼研究会の論文