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为改进超纯铁素体不锈钢的脱氧工艺,提高夹杂物控制水平,在硅钼高温电阻炉内对钛稳定超纯铁素体不锈钢的精炼过程进行了试验研究。结合热力学计算,研究了不同Si、Al含量(质量分数,下同)比值的硅铝合金的脱氧效果,以及脱氧、钛合金化和钙处理后钢中典型夹杂物的组成和形貌及粒度分布。结果表明:钢中初始氧含量相近的条件下,硅铝合金复合脱氧的钢中酸溶铝、全氧量与纯铝脱氧结果相近。硅铝复合脱氧后钢中夹杂物主要为(MgO-)Al2O3-SiO2复合脱氧产物。钛合金化后夹杂物的类型主要为Al2O3-MgO-(SiO2)-TiOx复合夹杂物和TiN。钙处理后的夹杂物主要为球形的MgO-Al2O3-CaO-SiO2-TiOx类复合氧化物。采用硅铝合金复合脱氧比纯铝脱氧钢的夹杂物的总数量、总面积和平均粒径均要小。
In order to improve the deoxidation process of ultrapure ferritic stainless steel and improve the control level of inclusions, the process of refining titanium-stabilized ultrapure ferritic stainless steel in silicon-molybdenum high temperature resistance furnace was studied. Combined with thermodynamic calculation, the deoxidation effect of Si-Al alloy with different Si and Al contents (mass fraction, the same below) was studied, and the composition and morphology of typical inclusions in steel after deoxidation, titanium alloying and calcium treatment and the particle size distribution . The results show that under the condition of similar initial oxygen content in steel, the contents of acid-soluble aluminum and total oxygen in the composite deoxidation of Si-Al alloy are similar to those of the pure aluminum deoxidation. The inclusions in the steel after the silicon-aluminum composite deoxidation are mainly (MgO-) Al2O3-SiO2 composite deoxidation products. The main types of inclusions after titanium alloying are Al2O3-MgO- (SiO2) -TiOx composite inclusions and TiN. The inclusions after calcium treatment are mainly spherical MgO-Al2O3-CaO-SiO2-TiOx composite oxides. The total number of inclusions using silicon aluminum alloy composite deoxidation than pure aluminum deoxidized steel, the total area and average particle size should be small.