In order to evaluate cleanliness of steel samples which contain oxygen in two different forms - chemically dissolved form and physically dispersed form in steel matrix, identification of each oxygen in the steel is important. A simple but promising method for simultaneous analysis of these two types oxygen in steel samples was developed in the present study using Inert Gas Fusion Infrared Absorption Method. By utilizing different carbothermic reaction temperature for each type of oxygen, the chemically dissolved oxygen (soluble oxygen) was first separated from the steel specimen at a low reaction temperature, while the physically dispersed oxygen (insoluble oxygen in the form of oxide inclusion) was separated at a higher reaction temperature. This idea was applied to a number of Al-killed ultra low carbon steel specimens, which contain alumina inclusions. It was shown that separation of the soluble oxygen and the insoluble oxygen was possible. The obtained oxygen content in this new method was independently validated by a conventional Inert Gas Fusion Infrared Absorption Method for the total oxygen content and by cross-sectional analysis of non-metallic inclusion for the insoluble oxygen. A possible supersaturation state of liquid steel after RH process was observed.

为了评估含有两种不同形式氧（钢基体中的化学溶解形式和物理分散形式）的钢样品的清洁度，识别钢中的每种氧是很重要的。在本研究中，使用惰性气体聚变红外吸收法开发了一种简单但有前途的方法，用于同时分析钢样品中的这两种类型的氧。通过对每种氧利用不同的碳热反应温度，首先在较低的反应温度下将化学溶解的氧（可溶性氧）从钢试样中分离出来，同时将物理分散的氧（以氧化物夹杂形式存在的不溶性氧）分离在较高的反应温度下。这个想法被应用于一些铝镇静超低碳钢试样，其中含有氧化铝夹杂物。结果表明，可溶氧和不溶氧的分离是可能的。在这种新方法中获得的氧含量通过常规惰性气体聚变红外吸收法对总氧含量和非金属夹杂物的横截面分析对不溶性氧进行了独立验证。观察到 RH 过程后钢水可能处于过饱和状态。