Effect of SiCa and SiCaBa Alloys on Deoxidation and Inclusions Denaturation of 304N Stainless Steel

doi:10.20057/j.1003-8620.2023-00025

Abstract

Abstract: The effects of deoxidation of SiCa （71Si -28Ca） and SiCaBa （52Si -14Ca-14Ba -1.82Al） alloys on the inclusions denaturation and total oxygen content of 304N stainless steel were studied experimentally. With the addition of SiCa or SiCaBa alloy， the MnO in the inclusions disappeared and was modified to CaO-Al₂O₃-SiO₂-MgO-（BaO） system， and the plasticity of the inclusions was enhanced. The number density of inclusions decreased from 350 to 170 number/mm²， the size increased from 0.8 to 2.7 μm， and the area percentage was 0.05% for SiCa treatment comparing to no deoxidizer treatment， but the total oxygen content did not decrease significantly. After SiCaBa alloy treatment， the melting point of the inclusion was further reduced， and the plasticity was further enhanced. The number density of inclusions was reduced to 155 number/mm² and the size was increased to 3 μm with an area ratio of 0.049%. And the total oxygen content was further reduced from 111×10^-6 to 36×10^-6. Moreover， SiCaBa alloy was added at 15 min after the addition of refined slag， compared with the test results after 30 min， the results showed that the number density of inclusions further decreased to 70number/mm²， the diameter decreased to 3.4 μm， with the least number of inclusions and optimal denaturation among several deoxidtation treatments . The total oxygen content was reduced to a minimum of 73% of the original steel sample， resulting in the highest cleanliness of 304N stainless steel after smelting.

Key words: SiCa Alloy, SiCaBa alloy, 304N Stainless Steel, Inclusions

摘要： 通过实验研究SiCa（Si 71%-Ca 28%）和SiCaBa（Si 52%-Ca 14%-Ba 14%-Al 1.82%）合金对304N不锈钢脱氧和夹杂物改性及总氧含量的影响。加入SiCa或SiCaBa合金后，夹杂物中MnO消失，并改性为CaO-Al₂O₃-SiO₂-MgO-（BaO）体系，塑性增强。SiCa处理相比于无脱氧剂处理，夹杂物数密度由350个/mm2降低至170个/mm²，尺寸由0.8 μm增加至2.7 μm，面积占比为0.05%，但全氧含量并未明显降低。SiCaBa合金处理后夹杂物熔点进一步降低，塑性进一步增强。夹杂物数密度降低至155个/mm²，尺寸增加至3 μm，面积占比为0.049%。全氧含量进一步降低，由111×10^-6降至36×10^-6。此外，在加入精炼渣15 min后加入SiCaBa合金，对比30 min后加入的试验结果表明：夹杂物的数量密度进一步下降到70个/mm²，直径3.4 μm，在几种脱氧处理中夹杂物数量最少、改性最优。全氧含量降至最低为原钢样的73%，使冶炼后的304N不锈钢洁净度达到最高。

关键词: SiCa合金, SiCaBa合金, 304N不锈钢, 夹杂物

CLC Number:

TF746

Chen　Zhang, Ding　Hang, Qiu　Bingli, Wang　Lijun. Effect of SiCa and SiCaBa Alloys on Deoxidation and Inclusions Denaturation of 304N Stainless Steel[J]. Special Steel, 2023, 44(4): 43-48.

陈漳, 丁航, 仇兵利, 王丽君. SiCa和SiCaBa合金对304N不锈钢脱氧和夹杂物变性的影响[J]. 特殊钢, 2023, 44(4): 43-48.

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