In response to the problem of coarse slag-bonding rim in 430 stainless steel production process t the chemical composition and physicochemical properties of the mold powder and slag-bonding rim are compared and analyzed using ICP- OES

hemispherical point melting point meter

viscometer and other equipment

and the microstructure of the slag-bonding rim is observed through the electronic probe to explore the mechanism of slag rim formation and growth. It is found that except C content of slag-bonding rim being 0.53% and C content original mold powder being 2.87%

the composition of the slag-bonding rim and the original mold powder is not much different

but viscosity and melting point are reduced

about 70% of the area of the slag rim consists of the sintered phase

the remaining 30% is the crystalline phase

mainly composed of cuspidine and melilite. The sintered phase of a large number of bonding become a main reason for the formation and growth of the slag rim. Increasing the proportion of pre-melt material to 70%-80% and the content of carbon black in the mold flux ^2%

and further stabilizing the melting process of the mold powder in production

can effectively inhibit the growth of the slag rim.