Design and Application of Refining Slag for Cold Heading Steel
Based on the composition design of cold heading steel and the characteristics of oxide generation in aluminum deoxidation,a refining slag was designed and validated through industrial experiments in the final stage of low-carbon steel production.Verification shows that the slag of the test furnace has good flowability,can adsorb A1203 inclusions to a large extent,has good desulfurization ability,and the steel w[S]is less than 0.010%,indicating good castability of the steel.Under this refining slag condition,the control level of total oxygen and inclusions in the steel is relatively good,with w(T.O)ranging from 0.000 97%to 0.002 04%.The control level of inclusions,especially composite spherical inclusions,is basically controlled within level 1.The 1/4 cold heading test of the steel shows no cracking or cracking,and the surface of the sample is good.