| 简介 |
PROBLEM TO BE SOLVED : To provide a method for producing a bearing steel having oxide-based non-metallic inclusion less than that in the conventional bearing steel and excellent rolling fatigue resistance.
SOLUTION : During tapping molten steel obtained with the decarburize-refining in a converter into a ladle from the converter, the metallic Al is added, and the molten steel in the ladle is deoxidized, and after tapping the molten steel, the converter slag existing in the molten steel in the ladle, is discharged, and after discharging the converter slag, flux is added into the ladle and the ladle slag having 1.5-3.0 mass ratio of the basicity (CaO/SiO2) is generated in the ladle. Successively, the above ladle slag and the molten steel, are stirred by injecting rare-gas into the molten steel and thereafter, a vacuum-degassing refining of the molten steel is performed with an RH vacuum-degassing apparatus to produce the bearing steel.
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