1. The author measured the change of inclusions in the processes of refining in acid and basic opem-hearth or electric arc furnace. The inclusiong are assorted as follows.
(1) Inclusion coming from outside.
(2) Inclusion in metal.
(3) Inclusfon which occur during solidification.
2. In case of acid open-hearth process, we must keep an eye upon a large quantity of inclusions which came irom outside or those occured in solidification.
3. Ordinary method for eliminating non-metallic inclusions are as folows.
(1) Prevemtion of inclusions coming from heartlh.
(2) Elimination of oxygen in metal. (By ingenious utilization of deoxidation with silicon)
(3) Decreasing oxidizing power of slag. (Making heavy slag in the final process of refining.)
(4) Preventing from miximg of fire-clay and oxidizing by air after tapping.
(5) Control of constituents in metal. (Increasing both manganese and silicon and ingenious utilization of alminum, )
(6) Active elimination of inclusions in metal. (Utilization of agent which eliminate inclusion as Fe-Mn slag or CaF
2.)
4. The author has also investigated some special points of eliminating inclusions in each steel making process.
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