Control of Non-metallic Inclusion Plasticity and Steel Cleanliness for Ultrathin 18 Pct Cr-8 Pct Ni Stainless Steel Strip
Control of Non-metallic Inclusion Plasticity and Steel Cleanliness for Ultrathin 18 Pct Cr-8 Pct Ni Stainless Steel Strip
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DOI：
10.1007/s11663-020-01862-4
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发表时间：
2020-05
期刊：
影响因子：
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通讯作者：
Jing Guo;Shao-wei Han;Xingrun Chen;Han-jie Guo;Yan Yan-Yan
中科院分区：
文献类型：
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作者：
Jing Guo;Shao-wei Han;Xingrun Chen;Han-jie Guo;Yan Yan-Yan
对18%Cr-8%Ni不锈钢进行了实验室渣钢平衡实验、热力学分析和工业试验，研究了渣成分对非金属夹杂物塑性和钢水洁净度的影响。首先，结果表明，精炼顶渣中应添加饱和MgO，特别是低碱度炉渣，以避免耐火炉衬的严重腐蚀。另外，随着炉渣碱度的增加，夹杂物中MgO+Al2O3含量增加，MnO含量减少；因此，夹杂物的塑性相应降低。相反，较高碱度的渣有利于降低总氧（T.O.），同时钢中溶解铝（Als）含量增加。根据实验结果和热力学分析，炉渣碱度（CaO/SiO2）在1.4~1.8范围内、Als低于10 ppm时，可以获得综合良好的夹杂物塑性和较高的钢水洁净度。这一点已被工业试验结果所验证。
Laboratory-scale slag-steel equilibrium experiments as well as thermodynamic analyses and industrial tests were performed for 18 pct Cr-8 pct Ni stainless steel to study the effect of slag composition on non-metallic inclusion plasticity and steel cleanliness. First, the results showed that saturated MgO should be added in refining top slag, in particular for low-basicity slag, to avoid heavy corrosion of the refractory lining. Further, the content of MgO + Al2O3increased and MnO content decreased in inclusions with an increase in the slag basicity; thus, the plasticity of inclusions decreased correspondingly. Conversely, higher-basicity slag was favorable for reducing the total oxygen (T.O.), while the content of dissolved aluminum (Als) in steel increased. On the basis of experimental results and thermodynamic analyses, it was concluded that comprehensive favorable inclusion plasticity and relatively high steel cleanliness could be achieved for slag basicity (CaO/SiO2) in the range of 1.4 to 1.8 and Als lower than 10 ppm. This was verified by industrial test results.