Development of Dephosphorization Technique on High-carbon Steel at LD-OT

oleh Atsushi Tazuke, Takashi Sugitani, Takashi Fujita, Takashi Abiko

Penerbit - Kobe Steel, Ltd, Japan

Kategori - Novel Am

It is difficult to enhance dephosphorization in a high carbon area. Therefore, to manufacture high carbon steel, fluorite is used to promote lime dissolution at LD and/or much carbon is added at secondary smelting after blowing to the low carbon area. Meanwhile, the recycling application of slag formed in LD with fluorite is limited in an attempt to avoid fluorine elution from the slag over the allowable limits set by the Environment Agency. Adding much carbon at secondary smelting causes a decrease in productivity due to prolonged smelting time. Therefore, a dephosphorization technique for manufacturing high-carbon steel at LD-OTB was developed. The experiment was carried out at Kakogawa Works. Calcium ferrite and manganese ore sinter were used as alternative materials for fluorite. An instrument for slag sampling was attached to a sub-lance probe. Slag during blowing was sampled by the instrument and the blowing was estimated. T.Fe in Slag increased as the manganese ore sinter increase in addition to calcium ferrite. Due to the T.Fe in slag increase, lime dissolution was promoted and dephosphorization was enhanced. As a result, manufacturing high carbon steel without fluorite was achieved.

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