超低氧条件下钢液脱氧与氧化物夹杂尺寸

研究真空感应熔炼过程中因炉衬材料热分解造成的脱氧元素烧损及其全氧含量的变化规律。在此基础上，探讨脱氧元素过饱和度对脱氧产物尺寸分布规律的影响，以及超低氧钢全氧含量与氧化物夹杂数量和尺寸的关系。结果表明，在真空感应熔炼条件下，残留在钢中的氧化物夹杂数量随脱氧元素铝烧损量增加而增加．熔炼超低氧钢的关键是避免炉衬热分解；脱氧产物尺寸随脱氧元素过饱和度增加而增加；超低氧铜的大颗粒夹杂主要来自炉衬材料。

Deoxidization of Extra-low Oxygen Steel and Size of Oxide Inclusions

The loss of deoxidizing elements resulting from thermal decomposition of lining materials and the change of total oxygen in molten steel during VIM refining are researched.On this basis,the effect of the supersaturation degree of deoxidizing elements on the size distribution of deoxidizing products and the relationship between the total oxygen content of extra-low steel and the amount and size of oxide inclusions are discussed.It's pointed out that,under the condition of VIM refining,the amount of oxide inclusions residue in molten steel increases with the increased loss of deoxidizing elements,and the key of melting extra-low oxygen steel is to avoid the thermal decomposition of lining material;the size of deoxidizing products increases with the increased degree of supersaturation of deoxidizing elements;larger inclusions granules found in extra-low oxygen steel come mainly from lining material.