誘導炉における不活性ガス吹き込みについて

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When argon gas was blown into structural carbon steel and stainless steel melted in 250kg induction furnace installing a porous plug on the furnace bottom, the underwritten results were obtained.(1) In case of the carbon steels with C 0.05%∼0.50%, oxygen content falls as low as 20∼30ppm by combination of argon gas blowing and Al deoxidation, and hydrogen content falls as low as 2∼3cc/100gr.(2) Pb of harmful elements is eliminated as low as 0.0001% but no decreasing of As and Sn is recognized.(3) CO decarburization progresses:The decarburizing rate in carbon content that is about 0.10%, under the conditions of 150kg melting weight and argon blowing amount of 25l/min., is as follows.In case of carbon steel 0.05% C/10 min.In case of SUS 403 0.02% C/10 min.
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