Zhang Yudi,Liu Jianhua,He Yang,et al.Industrial Experimental Study on Removal of Inclusions in Steel by Nitrogen Addition and Release Method[J].Special Steel,2023,44(06):53-57.
Zhang Yudi,Liu Jianhua,He Yang,et al.Industrial Experimental Study on Removal of Inclusions in Steel by Nitrogen Addition and Release Method[J].Special Steel,2023,44(06):53-57. DOI: 10.20057/j.1003-8620.2023-00040.
Industrial Experimental Study on Removal of Inclusions in Steel by Nitrogen Addition and Release Method
In the refining production of LF-RH of 42CrMoA alloy structural steel, the original production process and the industrial test technology of steel inclusion removal by nitrogen addition and release method were carried out, and the good experimental results were obtained. Through systematic sampling, it was found that adding nitrogen through bottom blowing during the LF refining process can increase T[N] in the steel to 260 × 10
-6
, and meet the demand of nitrogen release in the form of bubbles during RH vacuum refining process; Nitrogen addition and release method also had good total oxygen removal effects, after RH vacuum treatment, the average T[O] content reduction can reach 37.4%; Nitrogen addition and release method also had good inclusion removal effect, the number of inclusion per unit area can be reduced from the original 8.771 pieces / mm
2
to 3.585 pieces / mm
2
after treatment, and the removal rate can reach 34.6%; In all kinds of inclusions, nitrogen extraction method had the highest removal efficiency of alumina inclusion, the proportion of Al
2
O
3
inclusion in steel can be reduced from 83% to 74% after treatment, which effectively improved the cleanliness of 42CrMoA alloy structural steel.
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