低碳铝镇静钢不同二次精炼工艺的效果分析

Effect analysis of different secondary refining process on low-carbon aluminium killed steel

为了合理选择低碳铝镇静钢的二次精炼工艺,满足现代钢铁厂高效、洁净、低成本以及大规模稳定生产的需求,对LF精炼+钙处理、CAS精炼、LF精炼不钙处理、RH普通处理、RH轻处理等5种不同二次精炼工艺进行了对比分析。结果表明,RH轻处理工艺更适合生产碳含量窄成分控制的低碳铝镇静钢,工序成本最低33.17元/t;RH普通处理工艺钢水纯净度最好,中包钢水平均w(T.O)=16×10^(-6),精炼结束夹杂物总量11.2个/mm^2。应优先采用RH轻处理工艺,其次采用RH普通处理或CAS精炼工艺。LF可不采用钙处理工艺,对于有脱硫任务和连铸水口堵塞严重的钢厂采用LF精炼+钙处理更具有优势。

In order to reasonably choose second refining process of low carbon aluminum killed steel, meet the requirements of clean, efficient, low cost and stable mass production in modern steel plant, the five different second refining processes of LF with calcium treatment, CAS, LF without calcium treatment, RH ordinary treatment, RH light treatment were compared and analysised. Results showed that RH light treatment technology was more suitable for low-carbon alhminium killed steel in narrow composition control of carbon content, and the lowest cost was 33.17 yuan/t. The purity of molten steel by RH ordinary treatment process was the best, the total oxygen mass fraction of liquid steel was 16 ×10-6 in tunsish, the inclusion amount was 11.2/mm2 at the end of refining. RH light treatment process should be preferred, followed by RH ordinary treatment or CAS refining process. Ladle furnace equipment can not use calcium treatment process, but LF refining ＋ calcium treatment has more advantages for steel plant of that need desulfuring and continuous casting nozzle blocking.