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钢水快速结晶定碳测试时,要使定碳准确,必须考虑工艺条件变化对结晶温度的影响。在我厂,引起结晶温度变化的,主要是进入模子的钢水温度和钢水含磷量的变化。钢水入模温度的不同会使过冷度变化;含磷量的不同也会使结晶温度变化。钢水温度的影响比较复杂,为了讨论含磷量不同对结晶温度的影响,必须使钢水温度基本上一致,为此,我们选择了入模钢水温度比结晶温度高40℃～50℃的测试点。同时为了避开0.51% C 附近 C—T 曲线的
Rapid crystallization of molten steel carbon test, to make carbon accurate, we must consider the changes in process conditions on the crystallization temperature. In our plant, the change of crystallization temperature is mainly caused by the temperature of the molten steel entering the mold and the change of the phosphorus content in the molten steel. Molten steel into the mold temperature will make subcooling changes; different phosphorus content will also make the crystallization temperature changes. In order to discuss the effect of different phosphorus content on the crystallization temperature, the temperature of the molten steel must be basically the same. Therefore, we chose the test point where the temperature of the molten steel in the mold is 40 ℃ ~ 50 ℃ higher than the crystallization temperature. At the same time in order to avoid the 0.51% C near the C-T curve