Inclusion modification by calcium treatment in liquid steel processing

钢水加工中钙处理的夹杂物改性

• 批准号: 505545-2016
• 负责人: Dogan, Neslihan
• 金额: $ 3.93万
• 依托单位: McMaster University
• 依托单位国家: 加拿大
• 项目类别: Collaborative Research and Development Grants
• 财政年份: 2017
• 资助国家: 加拿大
• 起止时间: 2017-01-01 至 2018-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=618414
• 关键词: Inclusion; modification; calcium; treatment; liquid

There is an ever increasing demand for cleaner steels with a low oxide micro-particle (inclusion) content. This increasing demand has highlighted the limitations of our current knowledge in controlling and predicting micro-particle development during liquid steel where the formation of micro-particles is an unavoidable consequence of the current industrial steelmaking process resulting from 400-1000 ppm of oxygen in solution. Ca treatment by powder injection or wire feeding is a common technique used in steel refining to modify oxide inclusions, desulphurize steel and control the shape of sulphide inclusions. Too little or too much addition of calcium leads to incomplete or excessive modification of alumina inclusions or the formation of solid calcium aluminates or CaS, which are detrimental to the castability of steels.The proposed project will focus on the modification of alumina micro-particles' phase, size and morphology as a function of calcium additions and composition of liquid steel, and develop information leading to improved process design at the industrial scale. This will involve thermodynamic calculations and laboratory experiments, with industrial trials by the partner organisation ArcelorMittal Dofasco. This understanding of how the micro-particles form and develop during steel processing will determine the optimum rate of calcium addition as a function of steel oxygen and sulphur content so as to predict the lowest cost production strategies.

对氧化物微粒（夹杂物）含量低的清洁钢的需求不断增加。这种不断增长的需求凸显了我们目前在控制和预测钢液中微粒发展方面的知识的局限性，其中微粒的形成是当前工业炼钢过程中由于溶液中含有 400-1000 ppm 的氧气而不可避免的结果。通过喷粉或送丝进行钙处理是钢精炼中常用的技术，用于改变氧化物夹杂物、钢脱硫和控制硫化物夹杂物的形状。钙添加量过少或过多，会导致氧化铝夹杂物改性不完全或过多，或形成固体铝酸钙或CaS，不利于钢的铸造性能。本项目将重点研究氧化铝微粒的改性。相、尺寸和形态作为钙添加量和钢液成分的函数，并开发可改进工业规模工艺设计的信息。这将涉及热力学计算和实验室实验，并由合作伙伴安赛乐米塔尔多法斯科进行工业试验。了解钢加工过程中微粒如何形成和发展将确定钙添加量与钢中氧和硫含量的函数关系，从而预测最低成本的生产策略。