Abstract: The studied steelmaking flow sheet for tyre cord steel is 150 t LD-RH-LF-soft argon blowing-CC process. The plasticity of non-metallic inclusions in steel is controlled by adding deoxidation reagent Si-Mn during LD tapping and adding low basicity top slag during LF refining to carry out steel-slag reaction. Results show that in RH, LF, tundish-bloom procedure, the main inclusions in steel are respectively MnO-Al₂0₃ -SiO₂ ( RH) , CaO-Al₂O₃ -SiO₂ (LF) and MnO-Al₂O₃- SiO₂ (tundish and bloom) , It is available to control the quantity and size of inclusions in steel and the Al₂ 0₃ content in inclusions and to form plastic inclusions by using Si-Mn deoxidation and using SiC diffusion deoxidation, low basicity low A1₂O₃ top slag refining, controlling T[ 0] ≤20 x 10^-6 and [ Als] ≤0.001 3% .

Key words: Tyre Cord Steel, , T[0],  , [ Al]s, , Inclusions, Plasticity

摘要： 研究的帘线钢的冶炼流程为150 tLD-RH-LF-软吹氩-CC工艺。通过LD出钢时加入Si-Mn脱氧,并在LF加入低碱度顶渣进行钢渣反应控制钢中非金属夹杂物的塑性。结果表明,RH-LF-中间包和铸坯阶段,钢中主要夹杂物分别为MnO-Al₂O₃-Si0₂(RH),Ca0-Al₂O₃-Si0₂(LF)和MnO-Al₂O₃-SiO₂(中间包和铸坯),采用Si-Mn脱氧和SiC扩散脱氧,低碱度低Al₂O₃顶渣精炼,控制T[O]≤20×10-6,[A1]s≤0.0013%,可有效控制钢中夹杂物数量和尺寸,以及控制夹杂物中Al₂O₃含量并形成可塑性夹杂。

关键词: 帘线钢, T[O], [Al]s, 夹杂物, 可塑性