Production Practice of Ultra-Low Carbon Steel H1T in 150 mm×150 mm Small Billet

doi:10.20057/j.1003-8620.2024-00035

Abstract

Abstract: In order to solve the problems of high blooming cost of the traditional process route for ultra-low carbon steel H1T， including preprocessing， converter， RH， bloom/ingot continuous casting， and blooming， and the frequent blockage of nozzle in the process of continuous casting which leads to production interruption， a 150 mm×150 mm billet continuous casting production process has been developed. The process control has been focused on the blockage of continuous casting nozzle， and the changes of composition， slag system， and inclusions during the production process have been analyzed. The industrial production practice shows that the product of ultra-low carbon steel H1T has been successfully produced by adopting the process of adding aluminum for deoxidation in converter tapping， LF slag basicity > 10， top slag （FeO + MnO） ≤ 2%， stirring argon flow > 600 L/min to ensure desulfurization， RH process with oxygen blowing for deep decarburization under 65 Pa， and calcium treatment of molten steel. And the number of continuous heats has reached 10 heats.

Key words: Ultra-low Carbon Steel, Secondary Refining, Top Slag Modification, Calcium Treatment, Billet

摘要： 针对超低碳钢H1T传统的预处理-转炉-RH-大方坯连铸/模铸-开坯工艺生产成本高，以及连铸浇注过程中容易发生堵塞水口导致生产中断的问题，开发了150 mm×150 mm方坯连铸生产工艺，重点针对连铸水口结瘤堵塞进行工艺控制，并对生产过程中化学成分、渣系、夹杂物变化进行分析。工业生产表明，采用转炉出钢加铝脱氧、LF渣碱度＞10，顶渣（FeO+ MnO）≤2%，搅拌氩气流量＞600 L/min确保脱硫、RH工序在65 Pa以下吹氧深脱碳、钢水钙处理等工艺优化，成功生产出超低碳钢H1T产品，并且连浇炉数达到10炉次。

关键词: 超低碳钢, 炉外精炼, 顶渣改质, 钙处理, 小方坯

CLC Number:

TF769.2

Chen　Jun, Peng　Guangjian, Lin　Dan, Huang　Zhenhua. Production Practice of Ultra-Low Carbon Steel H1T in 150 mm×150 mm Small Billet[J]. Special Steel, 2024, 45(6): 17-22.

陈军, 彭光健, 林丹, 黄振华. 150 mm×150 mm小方坯超低碳钢H1T生产实践[J]. 特殊钢, 2024, 45(6): 17-22.

References

［1］马富平，包燕平. 超低碳钢方坯连铸生产工艺研究［J］. 炼钢， 2014， 30（2）： 49-52.
［2］周　健，李　强，赵家七，等. 含钛焊丝钢水口结瘤原因分析及改进［J］. 特殊钢， 2024， 45（1）： 48-53.
［3］王　郢，徐建飞，何　西，等. 38CrMoAl钢浇铸过程水口结瘤原因分析及工艺改进［J］. 特殊钢， 2021， 42（2）： 38-41.
［4］杨克枝，张乔英，常正昇. 含Ti铝镇静超低碳钢连铸过程水口堵塞控制实践［J］. 特殊钢， 2020， 41（6）： 36-40.
［5］马富平，包燕平，王毓男，等．超低碳铝镇静钢方坯连铸工艺［J］．北京科技大学学报，2011，31（增刊1）：42-45．
［6］马富平，包燕平，董志强. 防止超低碳铝镇静钢大方坯连铸水口堵塞的工艺实践［J］. 特殊钢， 2014， 35（1）： 23-25.
［7］ Zhao G L. Effects of sintering conditions on microstructure and mechanical properties of reactive hot pressed tib₂-sic ceramic composites［J］. Ceramics - Silikaty， 2016： 226-233.
［8］谢世春，姚云苗．低碳低硅铝镇静钢结水口的防治［J］．昆钢科技，2007（2）：4-8．
［9］田志国. 工业纯铁M6的RH真空脱碳工艺［J］. 四川冶金， 2022， 44（1）： 30-33.
［10］王子铮．超低碳钢RH脱碳工艺优化．本钢技术，2012（2）：13-15．
［11］周剑丰，罗　钢. 超低碳钢210 t RH脱碳精炼工艺的优化［J］. 特殊钢， 2015， 36（6）： 33-35.
［12］刘　彭，罗　钢，丁胜强，等. 超低碳钢顶渣改质工艺优化［J］. 金属材料与冶金工程， 2015， 43（3）： 27-31.
［13］李朋欢. 超低碳钢的顶渣改质工艺研究［J］. 浙江冶金， 2016（1）： 32-33+46.
［14］宋　波，韩其勇，王福明，等. 钢液喂CaSi变质Al2O3夹杂的热力学计算［J］. 特殊钢， 1999， 20（5）： 20-22.

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