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每年雨季给我厂侧吹碱性转炉操作带来很多困难,特别是钢锭的冒涨和皮下气泡严重使钢锭合格率降低和生铁消耗提高。我厂根据历年的经验教训,经研究采取了改进措施,收到显著效果。过去认为钢锭冒涨和皮下气泡的原因,是由于钢中存在H_2和N_2的结果。根据文献所载~*,钢中第一个皮下气泡的形成是由下列反应产生的:[C]+[FeO]→[FeO]+{CO}产生CO小气泡之后,H_2、N_2便向这个气泡内扩散,使其长大,一般H_2、N_2是不会自己产生皮下气泡的。实验证明,H_2含量达到80×10~(-5)%,N_2含量达到100×10~(-4)%以下,含Si量在0.20%以上时,虽然N_2、H_2含量增加,也不会发生皮下气泡(图1)。
Annual rainy season to my plant side of the operation of the basic blowing of the converter brought many difficulties, especially the risers of ingot and subcutaneous bubbles so that the passing rate of steel ingot and pig iron consumption increased. I plant based on years of experience and lessons learned by the study to take measures to improve, received significant results. In the past, it was thought that the causes of ingot ingot and subcutaneous bubbles were due to the presence of H 2 and N 2 in the steel. According to the literature *, the formation of the first subcutaneous bubble in the steel is caused by the following reaction: [C] + [FeO] → [FeO] + {CO} Diffusion within the bubble to grow, the general H_2, N_2 will not produce their own subcutaneous bubbles. Experiments show that when the content of H 2 reaches 80 × 10 -5% and the content of N 2 reaches below 100 × 10 -4%, even if the amount of Si is above 0.20%, the content of N 2 and H 2 will not occur Subcutaneous bubbles (Figure 1).