| 摘要 |
PROBLEM TO BE SOLVED: To provide a highly clean steel which can meet a requested characteristic for harsh environment in using machine parts, without using a high-cost remelting method. SOLUTION: A method for producing a highly clean steel includes producing an ingot, after pouring a molten steel melted in an arc melting furnace or a converter into a ladle, refining it in the ladle for a short time of 60 minutes or less, and degassing it for a long time of 25 minutes or more, particularly degassing for a long time setting the reflux amount of the molten steel eight times or more of the all molten steel with a reflux type of vacuum degassing device.
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