稀土耐热钢用连铸保护渣系设计及其基础性能
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- 英文论文题名：Design and Fundamental Properties of the Mold Flux for Rare Earth Heat Resistant Steel Continuous Casting
- 论文作者：亓捷 ; 刘承军 ; 姜茂发 ; 李春龙
- 英文论文作者：Qi Jie ; Liu Chengjun ; Jiang Maofa ; Li Chunlong ; Key Laboratory for Ecological Metallurgy of Multimetallic Ores(Ministry of Education) ; Northeastern University ; School of Metallurgy ; Northeastern University ; Baotou Iron and Steel(Group) Co. ; LTD
- 年：2016
- 作者机构：东北大学多金属共生矿生态化冶金教育部重点实验室;东北大学冶金学院;包头钢铁集团公司;
- 论文关键词：稀土耐热钢 ; 保护渣 ; 连铸 ; 黏度 ; 结晶物相
- 英文论文关键词：rare earth heat resistant steel ; mold flux ; continuous casting ; viscosity ; crystalline phase
- 会议召开时间：2016-05-19
- 会议录名称：第十九届（2016年）全国炼钢学术会议大会报告及论文摘要集
- 语种：中文
- 分类号：TF777
- 学会代码：ZGJS
- 会议名称：第十九届（2016年）全国炼钢学术会议
- 会议地点：中国湖南长沙
- 主办单位：中国金属学会炼钢分会
- 学会名称：中国金属学会
- 页数：1
- 文件大小：56k
- 原文格式：O
- 会议级别：全国
摘要
以Ce为主的稀土元素在耐热钢生产过程中的应用逐渐得到推广。然而,由于稀土耐热钢中含有较高含量的Ce,使得钢液具有极强的还原性。因此,在使用传统连铸保护渣进行浇铸时,结晶器内普遍存在剧烈的渣金界面反应,恶化保护渣理化性能,导致铸坯表面缺陷。针对稀土耐热钢的成分和夹杂物特征,本文设计开发了新型的CaO-Al_2O_3-Li_2O-B_2O_3-Ce_2O_3保护渣,并系统研究了新型保护渣理化性能和结晶物相的变化规律。结果表明,稀土钢耐热钢用连铸保护渣中Ce_2O_3的适宜添加量为5wt%,在此范围内,保护渣的黏度、熔化温度和转折点温度明显降低。Ce_2O_3的加入可有效抑制CaO的析出。新型保护渣中Li_2O和B_2O_3的适宜添加量分别为10wt%和5wt%,w(CaO)/w(Al_O_3)值为1.5,其主要结晶物相为CaCeAlO_4和LiAlO_2。新型保护渣在不断吸收稀土氧化物后,理化性能表现出良好的稳定性。
Rare earth elements such as cerium have been widely used in producing heat resistant steel,however,due to the high cerium content and strong reducibility of the liquid steel,serious slag-metal interface reactions occurred,the properties of the mold flux was deteriorated and surface defect of the casting billet was leaded.Considering the composition of rare earth heat resistant steel,a new mold flux with CaO-Al_2O_3-Li_2O-B_2O_3-Ce_2O_3 system was devised and the properties were systematically investigated.The appropriate content of Ce_2O_3 in the new mold flux was 5wt%,the viscosity,melting temperature and breaking temperature decreased,and the precipitation of CaO was restrained by adding Ce_2O_3.The appropriate contents of Li_2O and B_2O_3 were 10wt%and 5wt%respectively with a w(CaO)/w(Al_2O_3) value of 1.5,the main crystalline phases were CaCeAlO_4 and LiAlO_2.The properties of the new mold flux show good stability after absorbing rare earth oxides.
Rare earth elements such as cerium have been widely used in producing heat resistant steel,however,due to the high cerium content and strong reducibility of the liquid steel,serious slag-metal interface reactions occurred,the properties of the mold flux was deteriorated and surface defect of the casting billet was leaded.Considering the composition of rare earth heat resistant steel,a new mold flux with CaO-Al_2O_3-Li_2O-B_2O_3-Ce_2O_3 system was devised and the properties were systematically investigated.The appropriate content of Ce_2O_3 in the new mold flux was 5wt%,the viscosity,melting temperature and breaking temperature decreased,and the precipitation of CaO was restrained by adding Ce_2O_3.The appropriate contents of Li_2O and B_2O_3 were 10wt%and 5wt%respectively with a w(CaO)/w(Al_2O_3) value of 1.5,the main crystalline phases were CaCeAlO_4 and LiAlO_2.The properties of the new mold flux show good stability after absorbing rare earth oxides.
引文