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BOF+LF+RH+CC工艺路线生产IF钢,在RH脱碳前,钢水经脱氧和LF精炼后,钢中自由氧达到极低水平.根据表观脱碳速率常数的不同,这种极低氧钢水的RH脱碳可以划分为四个阶段.与传统三个阶段的RH脱碳不同的是在低速脱碳阶段和快速脱碳阶段存在一个脱碳速率介于两者之间的过渡阶段.在正规溶液模型的基础上,建立了能够准确预报钢液氧含量及顶渣FeO含量的RH脱碳模型.结果表明:在RH吹氧前,极低氧含量的钢液与顶渣之间基本不传氧;吹氧之后,钢液氧含量呈线性增加,当钢液氧势大于顶渣氧势后,钢液向顶渣传氧,渣中FeO含量上升;RH处理结束FeO含量较处理初始有所回升,但是仍处于极低水平,能够有效降低顶渣对钢液的二次氧化.
BOF + LF + RH + CC production of IF steel, prior to RH decarburization, steel after deoxidation and LF refining, the steel reaches a very low level of free oxygen according to the apparent decarburization rate constant of this very low RH decarburization of oxygen steel can be divided into four stages, which is different from the traditional three stages of RH decarburization in that there is a transitional stage with a decarburization rate between the low-speed decarburization stage and the rapid decarburization stage. Based on the formal solution model, an RH decarburization model was established to accurately predict the oxygen content of the molten steel and the top slag FeO content.The results show that before RH blowing oxygen, After oxygen blowing, the oxygen content of molten steel increases linearly. When the molten steel oxygen potential is greater than the top slag oxygen potential, the molten steel transfers oxygen to the top slag and the content of FeO in the slag increases. The FeO content at the end of RH treatment is higher than that of the initial treatment Has rebounded, but still at a very low level, can effectively reduce the top slag on the secondary oxidation of molten steel.