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发明公开
CN102719597A 一种无间隙原子钢的转炉出钢脱磷方法 无效 - 撤回

一种无间隙原子钢的转炉出钢脱磷方法
摘要：
本发明提供一种无间隙原子钢的转炉出钢脱磷方法，转炉吹炼终点，控制钢中氧值和碳含量分别在600-900ppm、0.030-0.050wt%；出钢前堵出钢口，出钢时用挡渣镖挡渣出钢，出钢时间不小于5min；同时按照不同罐次控制挂罐温度：转炉出钢1/3时，按一定量加入白灰、转炉渣、萤石、氧化铁皮，使脱磷反应快速进行。本发明IF钢的转炉出钢脱磷率可达到30-50%，并显著降低转炉炉内的压力，提高一拉成功率和钢水收得率。与已有技术相比，本发明还具有脱磷剂使用量小，成本较低；出钢温降小，能源消耗少的特点。
摘要（英）：

The invention provides a converter tapping dephosphorization method of an interstitial free steel. The method comprises steps of: at a converting endpoint, controlling oxygen value and carbon content in steel at 600-900 ppm and 0.030-0.050wt%; plugging a tapping port before tapping, and stopping the slag with slag stopping dart during tapping for no less than 5 min; at the same time, controlling hanging tank temperature according to different tank batches: at 1/3 of converter tapping, adding lime, converter slag, fluorite and iron oxide according to a certain amount to realize a rapid dephosphorization reaction. According to the invention, converter tapping dephosphorization rate of the IF steel can reach 30-50%; and pressure in the converter is significantly reduced; and one-time successful rate and the yield of liquid steel are improved. Compared with prior art, the invention has the characteristics of small usage amount of dephosphorization agent, low cost, small tapping temperature drop and little energy consumption.

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