In the previous study, however, it was unclear what effect deoxidation
had on improved filiform corrosion resistance as part of the conversion-coating process.
The experimental results show that melting of the investigated materials is accompanied by denitriding of the metal (denitriding is intensive in the deoxidation
period of the preliminary stage, and only slight in the final stage).
It is therefore very important to know the optimum amount of aluminium, introduced in the preliminary deoxidation
Boiling of the slag which takes place in this case should, on the one hand, intensify the mass exchange processes in the volume of the slag, including the removal or nitrogen and, on the other hand, deoxidation
of the surface with carbon reduces the dip in the degree of oxidation and they should have the directly opposite effect on the final nitrogen content.
Chemical Composition--Chemical composition determines if the filter will be vulnerable to attack by slag, deoxidation
products and other aggressive chemicals in the molten metal that can weaken or chemically attack the filter.
with carbon in melting in argon leads to the formation of porosity in ingots.
The results show that with other conditions being equal, the number, type and size of the nonmetallic inclusions depend mainly on the type and number of deoxidation
agents, the degree of pickup of these agents and the residual mass fraction in completed metal products.
The study determined that to increase the FBF, the amount of aluminum used for deoxidation
must be drastically reduced.
By means of change of activities of the deoxidizers in course of deoxidation
of molten steel and during solidification of the metal, crystallization and solid-phase reactions of formation of oxide phases occur in certain areas of phase equilibriums of the CaO-MgO-[Al.
high C SiC for deoxidation
, coke reduction and melt improvement;
Under conditions of <<Dneprospetsstal>> Works the steels of ShKh15 and ShKh15SG-V grades are melted in basic arc electric furnaces DSP-50 with next alloying by carbon ferromanganese (DSTU 3547-97), ferrosilicium FS65 (DSTU 4127-2002), deoxidation
and desulphurization in installation <<furnace-ladle>> (IFL) under slag melt of CaO-[CaF.
This reduces slag quantity which can be tapped into the ladle, stabilizing and improving alloy recovery, deoxidation
and steel cleanliness.