100 t LD-LF-RH-CC流程冶炼60Si2Mn弹簧钢非金属夹杂研究

特殊钢 ›› 2020, Vol. 41 ›› Issue (4): 15-18.

100 t LD-LF-RH-CC流程冶炼60Si2Mn弹簧钢非金属夹杂研究

刘飞¹,岳峰¹,刘佳伟²,肖波³, 翟万里³

北京科技大学1钢铁共性技术协同创新中心,2材料科学与工程学院，北京100083；
3江苏沙钢集团淮钢特钢股份有限公司总工办，淮安223002

收稿日期:2020-04-01 出版日期:2020-08-01 发布日期:2022-04-27
作者简介:刘飞(1995-),女,硕士生,2018年辽宁科技大学(本科) 毕业,中低碳钢大颗粒夹杂物控制研究。

Study on Nonmetallic Inclusions in Spring Steel 60Si2Mn Produced by 100 t LD-LF-RH-CC Flow Sheet

Liu Fei¹, Yue Feng¹ ,Liu Jiawei² ,Xiao Bo³ , Zhai Wanli³

1 Collaborative Innovation Center of Steel Technology ,2 School of materials science and engineering, University of Science and Technology Beijing, Beijing 100083 ;
3 Chief Engineer Office,Huaigang Special Steel Co Ltd,Jiangsu Shagang Group,Huai1 an 223002

Received:2020-04-01 Published:2020-08-01 Online:2022-04-27

摘要/Abstract

摘要： 试验60Si2Mn弹簧钢（/%:0.58C,1.75Si,0.75Mn,0.012P,0.005S,0.006Als,0.008Alt）的工艺流程为100t转炉不加铝饼脱氧,采用硅铁脱氧,控制终点[C]≥0.08%,出钢温度1620～1660℃,LF到站温度≥1500℃,精炼时间不少于35min,RH真空度≤100 Pa并且保持时间≥20 min,软吹前喂入硅钙线100 m进行变性夹杂物处理,150 mm方坯采用全程保护浇铸。分析结果表明,钢中氧含量在RH精炼过程中到达最低,在中间包阶段又有所回升。在LF精炼中,钢液增氮明显。夹杂物成分以Al₂O₃、SiO₂、MgO和CaO为主,在LF精炼过程中,SiO₂含量下降了26.7%,MgO和CaO含量上升了36.7%,最终铸坯中夹杂物成分为33%Al₂O₃,20.7%SiO₂,45%MgO和CaO,减少了钢中高硬度夹杂物的含量。

Abstract: The production process of tested spring steel 60Si2Mn(/% ：0.58C, 1.75Si,0.75Mn,0.012P,0.005S, 0.006Als ,0.008Alt)is not adding aluminum cake but adding ferrosilicon to deoxidize in an 100 t converter, controlling end [C]≥0.08% ,and tapping liquid temperature 1620 〜1660℃,LF original temperature ≥ 1500℃ ,refining time no less than 35 min,RH vacuum ≤100 Pa for，20 min,feeding 100 meters of calcium and silicon wire for modification of inclusions before soft blowing, in whole process shielding-atmosphere casting 150 nun square billet. Analysis results show that the oxygen content in steel reaches the lowest in RH refining process, and rises in tundish stage. In LF refining process, the nitrogen increase of liquid steel is obvious. Inclusions are mainly composed of A12O3 ,SiO2 ,MgO and CaO. During LF refining, the content of SiO₂ decreases to 26.7% , while the content of MgO and CaO increases to 36.7%. Finally, the inclusions in the casting billet are 33% Al₂O₃,20.7% SiO₂ and 45% MgO and CaO to decrease the high hardness inclusions in steel.

刘飞, 岳峰, 刘佳伟, 肖波, 翟万里. 100 t LD-LF-RH-CC流程冶炼60Si2Mn弹簧钢非金属夹杂研究[J]. 特殊钢, 2020, 41(4): 15-18.

Liu Fei, Yue Feng , Liu Jiawei , Xiao Bo , Zhai Wanli. Study on Nonmetallic Inclusions in Spring Steel 60Si2Mn Produced by 100 t LD-LF-RH-CC Flow Sheet[J]. Special Steel, 2020, 41(4): 15-18.