Abstract:
The cleanliness of IF steel slabs produced by the BOF-RH-CC process in different casting stages was investigated. Due to reoxidation at the casting beginning period, the[C],[O]
T,[N] contents of the first slab are higher than those of the slabs in other stages, and a few big size Al
2O
3 clusters exist in the first slab. The non-metallic inclusions in the normal slabs at the casting middle period is mainly small size Al
2O
3 blocks (≤ 30μm) and a few small size Al
2O
3 clusters (≤ 40μm). The transition and end slabs have still mainly small size Al
2O
3 blocks, but appear few big size (≥ 100 μm) composite inclusions.
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