论文部分内容阅读
本文以6吨VOD炉冶炼18-8型不锈钢为代表,对高Cr钢水真空吹氧脱C过程的元素变化规律给于了理论分析和讨论。指出充分注意和利用元素Si的氧化升温是小型VOD过程控制的特点之一。 在理论分析的基础上,确定了有关氧化期的12个目标函数,并采用“多元逐步回归分析”等方法,建立了这些目标值的经验模型,依此对熔池温度,脱C过程等目标值的主要影响因素做了定量讨论,由模型计算,初步确定了有关输入量的合理变化范围。再根据实际熔池中的氧平衡关系,推导出适于吹氧终点C含量控制的半经验公式: B4=20.535Δ[％c]+2.034l_g([％c]_i/[％c]_f)+1.498(e~(3.043[％C])_i—e~(3.043[％c]_f)此式为终点C含量的控制提供了依据。 文中根据模型的预极值与实际测量结果基本吻合。
In this paper, 6 tons of VOD furnace smelting 18-8 stainless steel as the representative of the high-Cr molten steel vacuum oxygen stripping C process elements to the theoretical analysis and discussion. It is pointed out that full attention and utilization of the elemental Si for the oxidation heating are one of the characteristics of the mini VOD process control. Based on the theoretical analysis, 12 objective functions for the oxidation period were determined, and empirical models of these target values were established by means of multiple stepwise regression analysis. Based on this, the target temperatures The main influencing factors of value are discussed quantitatively, and the reasonable range of the relevant input is initially determined by the model calculation. According to the actual oxygen balance in the molten pool, a semi-empirical formula suitable for controlling the oxygen content at the end of oxygen blowing is deduced: B4 = 20.535Δ [% c] +2.034l_g ([% c] _i / [% c] _f) +1.498 (e ~ (3.043 [% C]) _ i-e ~ (3.043 [% c] _f) This formula provides the basis for the control of the content of end point C. According to the model the pre-extremum basically agrees with the actual measurement results.