B18冷拔钢管精炼过程中洁净度和夹杂物分析

炼钢 ›› 2021, Vol. 37 ›› Issue (6): 64-70.

B18冷拔钢管精炼过程中洁净度和夹杂物分析

闵亮¹，彭其春¹，李建立¹，朱航宇¹，田研²

（1.武汉科技大学钢铁冶金及资源利用省部共建教育部重点实验室，湖北武汉 430081；
2.华菱集团衡阳钢管（集团）有限公司，湖南衡阳 421001）

出版日期:2021-12-05 发布日期:2021-12-03

Analysis of cleanliness and inclusions in refining process of B18 cold drawn steel tube

Online:2021-12-05 Published:2021-12-03

摘要/Abstract

摘要： 为改善夹杂物控制工艺提高冷拔钢管的质量与性能，对B18冷拔钢管在精炼过程中的夹杂物进行了系统分析。研究了精炼过程钢水洁净度和显微夹杂物成分、形貌、粒径分布及数量的演变规律。结果表明，从LF到VD工艺过程中钢水中T.O和氮含量有显著降低，但钢水进入中间包后均有少量回升；LF到VD过程钢中显微夹杂尺寸集中分布在0～5 μm，随着精炼工序的进行，钢中夹杂物数量总数不断减少；LF精炼过程钢中主要夹杂物是Si-Mn-Al和Si-Ca-Al-Mg型夹杂以及少量CaS、MnS，VD精炼过程Si-Mn-Al系夹杂向Si-Ca-Al-Mg型和CaS系夹杂转变；中间包钢水夹杂主要为MgO-Al₂O₃-CaS和CaS、MnS夹杂。大型夹杂物为SiO2-Al₂O₃、CaO-MgO-Al₂O₃和MgO-Al₂O₃-SiO₂等复合夹杂物，中间包内大型夹杂物的主要来源是脱氧反应产物、卷入的炉渣以及钢水与炉衬的反应产物。

关键词: 冷拔管, 洁净度, 夹杂物, 复合夹杂, 钢水二次氧化

Abstract: In order to improve the inclusion control process and improve the quality and performance of cold-drawn steel tubes, the inclusions in the refining process of B18 cold-drawn steel tubes were systematically analyzed. The evolution of the purity of molten steel and the composition, morphology, particle size distribution and quantity of the microscopic inclusions during the refining process were studied. The results showed that the content of T.O and N in molten steel decreased significantly from LF to VD process, but the molten steel increased a little after entering tundish. The size of micro inclusions in LF to VD process was concentrated in 0-5 μm, and the total number of inclusions decreased with the refining process. In LF refining process, the main inclusions were Si-Mn-Al and Si-Ca-Al-Mg type inclusions and a small amount of CaS and MnS. In the process of
VD refining, the Si-Mn-Al inclusions were transformed to Si-Ca-Al-Mg and CaS inclusions. The main inclusions in tundish steel were MgO-Al₂O₃-CaS and CaS、MnS inclusions.The large inclusions were SiO2-Al₂O₃, CaO-MgO-Al₂O₃, MgO-Al₂O₃-SiO₂ and other composite inclusions. The main sources of the large inclusions in tundish were deoxidation reaction products, slag involved and reaction products of molten steel and furnace lining.

Key words: cold drawn tube, cleanliness, inclusions, compound inclusions, molten steel reoxidation

闵亮, 彭其春, 李建立, 朱航宇, 田研. B18冷拔钢管精炼过程中洁净度和夹杂物分析[J]. 炼钢, 2021, 37(6): 64-70.

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