复吹转炉低磷钢生产工艺的优化

在济钢条件下,采用常规的铁水脱硫加转炉双渣的冶炼工艺生产低磷钢,很难将成品w(P)稳定控制在0.010%以下。基于转炉双渣大渣量生产试验,采用回归分析研究了影响冶炼过程脱磷效率的主要因素,确定了最佳的双渣吹炼时间、过程温度和炉渣成分控制,大幅度提高了冶炼过程的脱磷效率。该工艺在9Ni、高级别管线(X90/X100)的生产中得到广泛应用,成品w(P)稳定控制在0.006%以下,最低达到了0.004%,实现了低磷钢的批量生产。

Optimization of production process of low phosphorus steel in combined blowing converter

In the conditions of Jinan Iron ＆ Steel Co. ,Ltd, it was difficult to controlw（P） below 0. 010 % stably when producing low phosphorus steel using conventionalhot metal desulphurization plus dual slag smelting process. Based on production data oflarge slag amount of dual slag in converter, regression analysis of main factors thatinfluence the dephosphorization efficiency of smelting process were carried out. Theoptimum blowing time of dual slag smelting process, process temperature and slagcomponent controlling were determined. The dephosphorization efficiency of smeltingprocess was increased greatly. The technology was widely applied in the productionprocess of 9Ni, high grade pipeline steel （X90/X100）. iv （P） was controlled below0. 006 % and the minimum was 0. 004 0 %. Batch production of low phosphorus steelwas successfully realized in Jinan Iron ＆ Steel Co. ,Ltd.