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本文根据P_(气泡)=P_(H_2)+P_(N_2)+P_(CO),分析低碳镇静钢在凝固过程中产生气泡的条件,当凝固率达到包晶反应开始点时,最易产生气泡。由于平炉钢中氮含量较低而且稳定,故其影响不大;残余液相中的氧浓度由脱氧元素铝、硅的含量控制;氢浓度则决定于钢液原始含氢量和凝固偏析;为了防止皮下气泡的产生,主要应从降低钢液含氢量和提高钢液中的脱氧元素着手。
According to P_ (bubble) = P_ (H_2) + P_ (N_2) + P_ (CO), the condition of bubbles in the low carbon killed steel during solidification was analyzed. When the solidification rate reached the start point of peritectic reaction, bubble. The content of oxygen in the residual liquid phase is controlled by the content of deoxidizing elements aluminum and silicon; the hydrogen concentration is determined by the original hydrogen content of the molten steel and the solidification segregation; in order to ensure that the nitrogen content in the open hearth steel is low and stable, To prevent the generation of subcutaneous bubbles, mainly from reducing the hydrogen content of molten steel and improve the liquid steel deoxidation element to proceed.