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不同澆鑄階段IF鋼連鑄板坯潔凈度

Cleanliness of interstitial-free steel slabs produced in different casting stages

  • 摘要: 對采用轉爐-RH精煉-連鑄工藝生產的IF鋼連鑄板坯在不同澆鑄階段(開澆、正常、兩爐交接及澆鑄末期)的鑄坯潔凈度進行了較為細致地研究和對比分析.由于澆鑄初期存在二次氧化及較大程度地增碳,開澆坯C,OT,N含量遠高于其他時間段的鑄坯,并存在較大尺寸的簇群狀Al2O3夾雜.正常坯夾雜主要為尺寸較小(≤ 30μm)的塊狀及少量簇群狀Al2O3夾雜(≤ 40μm),交接坯及尾坯仍以較小尺寸的塊狀Al2O3夾雜為主,但存在極少量大于100μm的復合夾雜.

     

    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, theC,OT,N contents of the first slab are higher than those of the slabs in other stages, and a few big size Al2O3 clusters exist in the first slab. The non-metallic inclusions in the normal slabs at the casting middle period is mainly small size Al2O3 blocks (≤ 30μm) and a few small size Al2O3 clusters (≤ 40μm). The transition and end slabs have still mainly small size Al2O3 blocks, but appear few big size (≥ 100 μm) composite inclusions.

     

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