新しい強撹拌精錬炉の冶金特性について

概要

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A new secondary refining furnace has been developed, not depending on any vacuum metallurgy but utilizing an intensified gas injection compared with conventional processes.This furnace is named GRAF, taking the first letters of “Gas Refining Arc Furnace”.The influence of gas stirring on the refining functions such as deoxidation, desulfurization, inclusion removal and degassing were investigated by using a 3ton experimental furnace. As the result of two years operation, the number of treating attains to 600 heats, and it is concluded that GRAF has many effective refining functions.The degassing is about in the same level of ordinary vacuum processes. GRAF is also very suitable for manufacturing highly clean steels and for exact adjustment of steel chemistry.At present, this process is used for the refining of various types of high grade steels, high alloyed materials and Ni-base alloys.
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