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作 者:李学 吴华杰 刘维 孙彦辉 李明 Li Xue;Wu Huajie;Liu Wei;Sun Yanhui;Li Ming(Collaborative Innovation Center of Steel Technology,University of Science and Technology Beijing,Beijing 100083,China;Research Institute,Nanjing Iron and Steel United Co.,Ltd.,Nanjing 210035,China)
机构地区:[1]北京科技大学钢铁共性技术协同创新中心,北京100083 [2]南京钢铁股份有限公司研究院,南京210035
出 处:《特殊钢》2023年第4期49-53,共5页Special Steel
基 金:国家自然科学基金(U1660113)。
摘 要:为改善铝脱氧55Cr3弹簧钢连铸过程水口结瘤和连浇性差问题,讨论了不同钙线加入量时夹杂物的演变规律并开展工业试验。结果表明,将55Cr3钢的喂钙线长度由100 m减少到50 m的轻钙处理,钢液中钙含量控制到0.0017%左右,氧含量约为0.0026%,整体上夹杂物平均成分的熔点靠近1600℃液相线,CaS夹杂物的面积密度小于0.7个/mm^(2),水口结瘤问题得到了改善,平均连续浇注炉数从5~6炉提高到8~10炉,并且夹杂物评级结果合格率高达98%以上,轻钙处理技术取得了较好的效果。In order to improve the problem of nozzle clogging and poor continuous castability of 55Cr3 spring steel with alu-minum deoxidation during continuous casting,the evolution of inclusions precipitation in different adding value of calcium lines are discussed and industrial test are carried out.The experimental results show that the light calcium treatment of 55Cr3 steel by reducing the length of the calcium line from 100 m to 50 m,to control the calcium content of the molten steel to about 0.0017% and the oxygen content to about 0.0026%,on the overall,the meling point of the average compo-sition of inclusions at 1600℃ is close to the liquid phase line,the area density of CaS inclusions is less than 0.7 pcs·mm^(2),the problem of nozzle clogging has been improved,the average number of successive pouring heats has been increased from 5-6 to 8-10 heats,and the qualified rate of inclusions grading result is above 98%,and the light caleium treatment technol-ogy has achieved better results.
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