Study on Refining Technology of High Quality Cord Steel Production
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摘要: 针对高品质帘线钢对钢中夹杂物组分及钢液洁净度的严格要求,系统地开展了钢包顶渣组成和精炼工艺流程的研究。理论研究结果和生产实践表明,精炼过程将钢包顶渣二元碱度(CaO/SiO2)控制在1.0左右,渣中Al2O3含量控制在6%~8%,可以将夹杂物基本控制在低熔点塑性区域;与DeS-LD-LF-Ar-CC工艺相比,采用DeS-LD-LF-RH-CC生产工艺可以在实现夹杂物塑性化转变的同时进一步降低钢中T[O]、[N],提高钢液洁净度。所生产的帘线钢吨钢断丝率平均为0.47次/t,疲劳寿命在2万次以上。Abstract: In order to meet the strict requirements of inclusion and cleanliness for high quality cord steel,top slag composition and refining process had been studied through predication and industrial practice.The results show that the inclusions can meet the requirements of plasticity at lower melting temperature when the tap slag basicity (CaO/SiO2) and Al2O3 content are controlled at about 1.0 and in the range of 6%~8%,respectively. Compared with the process of DeS-LD-LF-Ar-CC,the process of DeS-LD-LFRH-CC can lead to inclusion meeting requirements of plasticity and further reducing content of T[O] and [N],and thus improve the cleanliness. The average wire broken ratio of cord steel products is 0.47 time per ton and the fatigue lifetimes reached over 20,000 cycles.
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Key words:
- cord steel /
- inclusion /
- secondary refining process /
- refining slag
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