摘要
通过水模型、氧氮分析以及大样电解分析,对某钢厂挡坝结构优化后的中间包流场及尾坯洁净度进行分析。结果表明:适当增加原挡坝高度并在其上开两个导流孔,能使理论残钢量由9.17 t降至4.47 t,并使正常浇铸时的中间包流场有所优化,死区比例减少33.04%,平均停留时间增加4.40%;中间包浇铸末期对尾坯不同位置的全氧和氮含量影响不大;尾坯中大型夹杂物主要来自结晶器卷渣,大型夹杂物尺寸以140~300μm和大于300μm尺寸为主,分别占大型夹杂物质量的19.94%和73.21%。
The flow field in tundish and the cleanliness of last slab after adjusting the shape of dams in tundish were studied by means of water modeling testing, total oxygen and nitrogen content analysis, Slims, SEM and EDS. The results show that the theoretical residual steel quantity declines from 9.17 to 4.47 t using the high dam with two upward holes, meanwhile, the dead zone is decreased by 33.04% and mean residence time is increased by 4.40%. The total oxygen and nitrogen contents of the last slab were basically unchanged along the casting direction. The size of large-sized inclusions in last slab are mainly from trapped in mold, they were mostly from 140 μm to 300 μm and over 300 μm, which accounted individually for 19.94% and 73.21% of total large-sized inclusions.
出处
《铸造技术》
北大核心
2017年第9期2193-2195,共3页
Foundry Technology
关键词
中间包
尾坯
水模型
洁净度
夹杂物
tundish
last slab
water modeling
cleanliness
inclusion
