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The bottom tapping induction furnace for reducing the large nonmetallic inclusion, has been developped, with the gas atomizing process, so called IFB (Induction Furnace Bottom Tapping) process, instead of conventional tilting furnace process.Result in this report.(1) The large inclusion more than 10μm, is extremely reduced by IFB process, compared with conventional process.This phenomenon is due to the decrease of the inclusion involved from the tilting furnace to the tundish.(2) The bending strength is improved by the decrease of the large inclusion, in particularly right angle of the rolling direction.(3) Moreover numbers of defect of cold roll material, are reduced in rolling size more than 30mm, at ultrasonic test.(4) Only one problem of the IFB process is the large standard deviation with the particle size distribution.Now, we have researched the new process for improving this problem.

Improvement of the high speed steel purity used for the induction furnace bottom tapping.