Bearing steel, high carbon chrome and a production method of the same

摘要

Provided is a production method including: heating a workpiece at a temperature higher than an A c1 transformation point in a carburizing atmosphere; slowly cooling the workpiece at not more than 70°C /Hr down to a temperature T satisfying Formula (1) while maintaining the carburizing atmosphere: A r1 -20‰¥T(°C)‰¥300°C ... (1); and cooling the workpiece in an oxidizing atmosphere. According to this method, it is possible to efficiently produce a high-carbon chromium bearing steel whose depth of the recarburized layer or the overcarburized layer is within a range from 0 to 0.2 mm, having less machining allowance, and excellent in machinability, using a steel tube after hot tube-making.