硫质量分数对Ti-Zr脱氧E36钢中夹杂物的影响

为明确钢中硫质量分数对Ti-Zr脱氧的E36船板钢中夹杂物的影响,在1873K下,在MoSi2电阻炉上用70mm×100mmMgO坩埚开展了3炉E36钢炼钢实验.结果表明,Ti-Zr脱氧钢中夹杂物主要以含TiOx和ZrO2成分的外围包裹MnS的球形夹杂物为主,典型夹杂物为Al2O3-TiOx-MnS,MgO-SiO2-Al2O3,Al2O3-SiO2-TiOx-ZrO2,TiOx-SiO2-Al2O3-MnS等.随着硫质量分数的增加,小于10μm的夹杂物所占比例逐渐提高到99.5%,夹杂物平均直径由1.7μm增大到2.3μm,夹杂物中平均硫质量分数和单个夹杂物中MnS所占的面积百分比均增加,w[S]=0.0015%时面积比为0.15%,w[S]=0.011%时面积比达到0.72%.

Effect of Sulfur Mass Fraction on Inclusions in Steel E36 Deoxidized by Titanium and Zirconium

In order to study the effect of sulfur mass fraction on inclusions in steel E36 deoxidized by titanium and zirconium， steelmaking experiments of three heats of steel E36 were done in a MoSi2 furnace with 70mm×100mm MgO crucible at 1873K. The results showed that most of the inclusions in steel E36 deoxidized by titanium and zirconium are spherical inclusions of TiO○x and ZrO2 coated by MnS. The typical inclusions are Al2O3-TiO○x-MnS， MgO-SiO2-Al2O3， Al2O3-SiO2-TiO○x-ZrO2 and TiO○x-SiO2-Al2O3-MnS. With the increasing of the sulfur mass fraction in steel， the inclusion percentages with the diameter less than 10μm increase to 99.5%; the average diameter of the inclusions reaches 2.3μm from 1.7μm; the sulfur mass fraction in the inclusions and the area of MnS in single inclusion are also bigger， the area is 0.15% when w［S］ is 0.001 5%， and it becomes 0.72% when w ［S］ is 0.011%.