Tundish open eye formation: Quantify the effect and improve steel cleanliness

中间包开眼形成：量化效果并提高钢的清洁度

• 批准号: 481376-2015
• 负责人: Chattopadhyay, Kinnor
• 金额: $ 1.82万
• 依托单位: University of Toronto
• 依托单位国家: 加拿大
• 项目类别: Engage Grants Program
• 财政年份: 2015
• 资助国家: 加拿大
• 起止时间: 2015-01-01 至 2016-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=581734
• 关键词: Tundish; open; eye; formation; Quantify

Arcelor Mittal Dofasco is the largest producer of steel in Canada with an annual production of 4.2 million tons. Its major products are pipeline grades and automotive grades, both of which requires high quality slabs. One of the major problems AM Dofasco faces during continuous casting is re-oxidation of the liquid steel in the tundish, and resulting in the formation of oxide inclusions. The major harmful inclusions are Al2O3 and spinels which result in nozzle clogging. To prevent re-oxidation of the melt stream while transferring from ladle to tundish, the liquid metal is inert gas shrouded by injecting Ar gas just below the slide gate. Also, the liquid steel surface is covered with a layer of tundish slag to prevent any surface oxidation. However, more than the desired amount of Argon gas may get aspirated into the ladle shroud during inert gas shrouding. The aspirated Argon bubbles produce recirculatory flows which on reaching the steel-slag interface displaces the top slag layer creating an exposed eye of steel.In the present study, the formation of slag 'eye', its harmful effects on re-oxidation, and inclusion formation in AM Dofasco's twin slab caster tundish will be analyzed. Mathematical modelling will be performed, and various practices will be evaluated and then will be complemented with plant trials. The use of clean steel will prolong working life of products, reduce the cost of maintenance, decrease impact on the environment, and improve the quality of steels for the Canadian manufacturing sector, all of which will generate economic benefit for Canada. Direct benefits will also include the training of highly qualified personnel for subsequent employment within Canadian-based industrial organizations and improving competitiveness of a Canadian company both of which will boost Canadian excellence in science and technology.

Arcelor Mittal Dofasco是加拿大最大的钢铁生产商，年产量为420万吨。其主要产品是管道级和汽车级，这两种产品都需要高质量的板坯。AM Dofasco在连铸过程中面临的主要问题之一是中间包中钢液的再氧化，并导致氧化物夹杂物的形成。主要的有害夹杂物是Al 2 O3和尖晶石，它们会导致水口堵塞。为了防止在从钢包转移到精炼炉时熔体流的再氧化，通过在滑动浇口的正下方注入Ar气体来保护液态金属。此外，钢液表面覆盖有一层中间包渣，以防止任何表面氧化。然而，在惰性气体吹扫期间，多于期望量的氩气可能被吸入到钢包长水口中。的 抽吸的氩气气泡产生再循环流，到达钢-渣界面时，置换顶部渣层，形成钢的暴露眼。在本研究中，将分析AM Dofasco双板坯连铸机中间包中渣“眼”的形成、其对再氧化的有害影响以及夹杂物的形成。将进行数学建模，并对各种做法进行评估，然后辅以工厂试验。清洁钢的使用将延长产品的使用寿命，降低维护成本，减少对环境的影响，并提高加拿大制造业的钢材质量，所有这些都将为加拿大带来经济效益。直接收益还包括 培训高素质的人员，以便今后在加拿大的工业组织中就业，并提高加拿大公司的竞争力，这两方面都将促进加拿大在科学和技术方面的卓越成就。