On the Coagulation of Inclusions in Deoxidation with Silicon-Manganese
1972 Volume 58 Issue 6 Pages 685-693
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1972 Volume 58 Issue 6 Pages 685-693
It is well known that coagulation of inclusions plays an important role in removal of them in deoxidation of steel with silicon-manganese. The influence of chemical composition of inclusions on the coagulation in static iron melt was investigated.
The results obtained are as follows;
1) The compositions of the primary inclusions in the initial period of deoxidation deviated from those in equilibrium with iron melt.
2) The inclusions tended to be enriched in MnO when manganese had been added prior to siliconmanganese.
3) The floating velocity of inclusions was expressed by Stokes' one or 3/2 of it.
4) The coagulation of inclusions on the way of floating in iron melt took place actively at a ratio [Mn]/[Si]=4 in which liquid inclusions only precipitated in the initial period.
5) Solid silica in inclusions seems to suppress the coalescence of the inclusion particles touched each other and to reduce the coagulation.
