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| 帘线钢凝固过程夹杂物生成热力学及工业实践 | |
| 引用本文： | 牛凯军,杨文,张立峰,储焰平,张洪起,郭子强.帘线钢凝固过程夹杂物生成热力学及工业实践[J].钢铁,2020,55(6):61-67. |
| 作者姓名： | 牛凯军 杨文 张立峰 储焰平 张洪起 郭子强 |
| 作者单位： | 1. 北京科技大学冶金与生态工程学院, 北京 100083; 2. 燕山大学亚稳材料制备技术与科学国家重点实验室, 河北 秦皇岛 066004; 3. 河钢集团钢铁研究总院, 河北 石家庄 050011 |
| 基金项目： | 国家重点研发计划专项资助项目(2017YFB0304000,2017YFB0304001); 国家自然科学基金资助项目(51874031,U1860206,51725402); 中央高校基本科研业务费专项资金资助项目(FRF-TP-17-001C2,FRF-AT-18-004) |
| 摘 要： | 非金属夹杂物是影响帘线钢拉拔性能的重要因素之一,为了研究帘线钢中夹杂物的生成及转变机理,使用ASPEX自动扫描电镜观察分析了帘线钢工业生产过程中不同碱度条件下从钢液到铸坯中非金属夹杂物的转变现象,并使用FactSage7.0热力学计算软件对非金属夹杂物的转变机理进行了讨论。在高碱度条件下,钢液中非金属夹杂物主要类型为低熔点的CaO-SiO2-Al2O3-MnO,铸坯中非金属夹杂物的CaO和MnO含量有所降低,同时SiO2含量有所增加。在低碱度炉次中,钢液中非金属夹杂物主要为较高熔点的SiO2-MnO-CaO类型,Al2O3含量较低。连铸坯中非金属夹杂物的SiO2含量与钢液相比有所增加,同时MnO含量降低。热力学计算结果表明,帘线钢凝固和冷却过程中的非金属夹杂物转变由夹杂物自身的相转变和析出、非金属夹杂物和钢液间的化学反应以及溶解氧和钢基体化学成分的反应3方面原因造成。热力学计算结果较好地解释了帘线钢工业生产中钢液和铸坯中非金属夹杂物成分和形貌的转变,为帘线钢中非金属夹杂物的控制提供参考。 |
| 关 键 词： | 帘线钢 凝固 冷却 非金属夹杂物转变 热力学 |
| 收稿时间： | 2019-10-08 |
Thermodynamics and industrial practice of formation of inclusions during solidification of tire cord steels |
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| NIU Kai-jun,YANG Wen,ZHANG Li-feng,CHU Yan-ping,ZHANG Hong-qi,GUO Zi-qiang.Thermodynamics and industrial practice of formation of inclusions during solidification of tire cord steels[J].Iron & Steel,2020,55(6):61-67. | |
| Authors: | NIU Kai-jun YANG Wen ZHANG Li-feng CHU Yan-ping ZHANG Hong-qi GUO Zi-qiang |
| Affiliation: | 1. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China; 2. State Key Lab of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, Hebei, China; 3. The Centre of Iron and Steel Technology Research Institute, HBIS, Shijiazhuang 050011, Hebei, China |
| Abstract: | Non-metallic inclusions are one of the important factors that affect the drawing performance of tire cord steels. In order to study the formation and transformation mechanism of inclusions in tire cord steel, the transformation of nonmetallic inclusions from molten steel to billet under different basicity in the industrial process of tire cord steel was observed and analyzed by ASPEX automatic scanning electron microscope. The transformation mechanism of nonmetallic inclusions was discussed using FactSage 7.0 thermodynamic calculation software. Under the condition of high basicity, the non-metallic inclusions in the molten steel are mainly CaO-SiO2-Al2O3-MnO type with a low melting point. The content of CaO and MnO in non-metallic inclusions in the billets decreases, while the content of SiO2 increases. In the heat refined by low-basicity slag, the non-metallic inclusions in molten steel are mainly SiO2-MnO-CaO type with a high melting point and the low content of Al2O3. The content of SiO2 of non-metallic inclusions in billets is higher than that in the molten steel, and the content of MnO is lower. It was indicated from the thermodynamic calculation that the transformation of non-metallic inclusions in the process of solidification and cooling of tire cord steels is caused by the phase transformation and precipitation of inclusions, the reaction between inclusions and molten steel and reaction between the dissolved oxygen and elements in the steel matrix. The transformation of the composition and morphology of inclusions from the molten steel to the billet during the industrial production of tire cord steels was well explained by the thermodynamic analysis,and provide a reference for the control of non-metallic inclusions in tire cord steels. |
| Keywords: | tire cord steel solidification cooling non-metallic inclusion transformation thermodynamic |
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