Abstract: Compares the effects of two different tundish argon replacement methods, scheme I uses the argon rod to replace the air in the inner cavity of the tundish, and scheme 0 uses the joint action of argon gas pipe and argon rod on the tundish cover to replace the air in the tundish. Select the same steel grade, specification, replacement time and pipeline pressure to carry out the process test. Through comparison: (1) scheme U can more effectively replace the air in the inner cavity of the tundish and reduce the probability of secondary oxidation； (2) The oxygen content, nitrogen content, Als/Alt, inclusions in steel and other indicators of scheme H is better than those of scheme I , indicating that the protective casting effect of scheme II is better； (3) Scheme U can effectively prevent the formation of inclusions below 10 μm, especially small particle inclusions in the range of 2 μm ≤ X ＜5 μm.

Key words: First Heat, Secondary Oxidation, Cleanliness, Inclusion

摘要： 对比了两种不同中间包氩气置换方式的效果，方案一釆用氩气杆的方式置换中间包内腔的空气，方案二采用中间包盖氩气管和氩气杆的共同作用的方式置换中间包内的空气。选择相同的钢种、规格、置换时间及管道压力，开展工艺试验。通过比较得出：(1)方案二更能有效地置换中间包内腔的空气，减少二次氧化的概率；(2)方案二的氧含量、氮含量、Als/Alt、钢中夹杂物等指标均优于方案一,说明方案二的保护浇注效果更好；(3)方案二可有效预防10 μm以下夹杂物的产生,尤其是2 μm ≤ X ＜5 μm的小颗粒夹杂物。

关键词: 首炉, 二次氧化, 洁净度, 夹杂物