| 摘要 |
PURPOSE:To carry out converter steelmaking with reduced attrition of a gaseous CO blowing means and without damaging the quality of molten steel by using comparatively inexpensive gaseous CO, supplying gaseous O2 from above the bath surface, and supplying gaseous CO from below the bath surface to agitate the steel bath. CONSTITUTION:Gaseous O2 is supplied from above the bath surface of a converter, and gaseous CO is blown as the agitating gas into the molten steel from a tuyere made of a stainless steel pipe, etc. which is provided at the bottom of the converter. And the steelmaking is carried out while agitating the molten steel. The gaseous CO having >=80vol% purity is necessarily used in this case. By this invention, the durability of the gaseous CO blowing means can be remarkably improved without any unfavorable effects on the quality of the product by agitating the molten metal with the gaseous CO having said purity which can be obtained at comparatively low cost.
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