Chen Zhang,Ding Hang,Qiu Bingli,et al.Effect of SiCa and SiCaBa Alloys on Deoxidation and Inclusions Denaturation of 304N Stainless Steel[J].Special Steel,2023,44(04):43-48.
Chen Zhang,Ding Hang,Qiu Bingli,et al.Effect of SiCa and SiCaBa Alloys on Deoxidation and Inclusions Denaturation of 304N Stainless Steel[J].Special Steel,2023,44(04):43-48. DOI: 10.20057/j.1003-8620.2023-00025.
Effect of SiCa and SiCaBa Alloys on Deoxidation and Inclusions Denaturation of 304N Stainless Steel
The effects of deoxidation of SiCa (71%Si-28%Ca) and SiCaBa (52%Si-14%Ca-14%Ba-1.82%Al) 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-Al
2
O
3
-SiO
2
-MgO-(BaO) system, and the plasticity of the inclusions was enhanced. The number density of inclusions decreased from 350 to 170 number/mm
2
, 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/mm
2
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/mm
2
, 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.
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