工程科学学报2016，Vol.38Issue(3)：342-350,9.DOI:10.13374/j.issn2095-9389.2016.03.007
高拉速连铸低碳铝镇静钢铸坯中夹杂物
Inclusions in low carbon aluminum killed steel slabs at high casting speed
苑鹏 1王新华 2姜敏 2冀云卿 2王万军2
作者信息
- 1. 首钢技术研究院薄板研究所，北京100043
- 2. 北京科技大学冶金与生态工程学院，北京100083
- 折叠
摘要
Abstract
Inclusions in the surface of low carbon aluminum killed steel slabs cast at high casting speed were analyzed by Aspex automated scanning electron microscopy in a large area. The changes in number and size of inclusions were tested at different casting speeds, and the influence of flow fields and sulfur content on the distribution of inclusions was explained in detail. It is found that when the casting speed increases, the depth and length of hooks decrease. Hooks in the slab subsurface is not obvious when the cast-ing speed larger than 2 m·min-1 , so inclusions larger than 200μm cannot be found in the slab surface. Inclusions with the size of 50-200μm in the slab surface are mainly entrapped by the solidified shell, and the entrapment of inclusions is influenced by forces acting on inclusions at the solidifying front. The flow velocity of molten steel increases due to increasing casting speed, then the washing force becomes large and the entrapping force becomes small, and therefore the number of entrapped inclusions decreases. If the sulfur con-tent in the steel is high at high casting speed, inclusions will be easily entrapped by the solidified shell due to the thermal Marangoni force acting on inclusions obviously.关键词
低碳钢/连铸/板坯/夹杂物Key words
low carbon steel/continuous casting/slabs/inclusions引用本文复制引用
苑鹏,王新华,姜敏,冀云卿,王万军..高拉速连铸低碳铝镇静钢铸坯中夹杂物[J].工程科学学报,2016,38(3):342-350,9.
