Abstract：The effect of high-basicity refining slag on the total oxygen content and inclusions in bearing steel GCr15 has been studied by laboratory slag/steel reaction equilibrium experiments. Combined the experimental results with thermodynamic analysis， the changes of the total oxygen content， inclusion size distribution， particle size and evolution of inclusions were investigated. The obtained results showed that the total oxygen content could be lowered to 0.000 6% and the average size of oxide inclusions was minium as 2.26 μm using the refining slag of 59.4%CaO-24.8%Al2O3-9.8%SiO2-6%MgO. With the increase of Mg and Ca contents in steel， the evolution of oxide inclusions was： Al2O3→MgO·Al2O3→MgO→CaO-Al2O3-MgO complex inclusion(MgO surrounded by CaO-Al2O3). At the earlier stage of slag/steel reaction， the dominant inclusions in steel was MgO·Al2O3， whereas the inclusions were mainly MgO and CaO-Al2O3-MgO at the later stage. The evolution of oxide inclusions observed in the experiments agreed well with that predicted by thermodynamic calculation. The size of most oxide inclusions was smaller than 5 μm.
葛金朋， 李 晶， 史成斌， 王 鹏. 高碱度精炼渣对GCr15轴承钢洁净度的影响[J]. 钢铁, 2016, 51(11): 30-35.
GE Jin-peng， LI Jing， SHI Cheng-bin， WANG Peng. Effect of high-basicity refining slag on cleanliness of bearing steel GCr15. Iron and Steel, 2016, 51(11): 30-35.
2016, Vol. 51 
