能够造成冷轧薄板表面缺陷的钢中夹杂物主要是簇群状Al2O3、“Ar气泡+Al2O3”和结晶器保护渣卷入形成的大型夹杂物.在正常稳定连铸条件下,目前已能够做到对结晶器保护渣卷渣形成夹杂物加以有效控制.在各类非稳浇铸铸坯中,浇次开浇头坯的品质降低最严重,浇次尾坯中保护渣卷渣形成的夹杂物数量明显多于正常坯,炉-炉间交接坯和快换浸入式水口期间浇铸铸坯中,来源于保护渣卷入形成的夹杂物数量也多于正常坯试样.首钢京唐公司生产冷轧薄板钢类,在1.0～2.0 m/min拉速范围,大型夹杂物随拉速增加呈减少趋势,对此应加以关注.研究发现,尺寸100 μm以上的有害夹杂物主要存在于铸坯2mm表层内,生产“无表面缺陷”要求的汽车外板,应该采用铸坯表面清理.
参考文献
| [1] | Sahai Y;Emi T.Tundish Technology for Clean Steel Production[M].Singapore:World Scientific Publishing Co Pte Ltd,2008 |
| [2] | 丸川雄净.大量生產規模における不純物元素の精制限界の挑戰[A].東京:日本鉄鋼協会高温プロセス部会精錬フオ-ラム,1996:1. |
| [3] | Hasunuma J;Kurose Y;Hiwasa S.Production of Ultra-Low Carbon Steel by K-BOP-RH Process at Kawasaki Steel[A].Detroit:Iron and Steel Society,1990:91. |
| [4] | Yoshida J;Iguchi M;Yokoya S .Water Model Experiment on Mold Powder Entrapment Around the Exit of Immersion Nozzle in Continuous Casting Mold[J].Tetsu-to-Hagane,2001,87:529. |
| [5] | Awajiya Y;Kubota J;Takeuchi S.Inclusion Entrapment Location in Solidified Shell of Ultra Low Carbon Steel Slab[A].Charlotte:Iron and Steel Technology,2005:65. |
| [6] | Miyake T;Morishita M;Nakata H et al.Influence of Sulfur Content and Molten Steel Flow on Entrapment of Bubbles to Solid/Liquid Interface[J].ISIJ International,2006,46:1817. |
| [7] | Lee S-M;Kim S-J;Lee H-G.Surface Tension and Temperature Effect on Ar Bubbles Behavior at the Solid/Liquid Interface of the Steel[A].Tokyo:ISIJ,2010:81. |
| [8] | Nakamura H;Kohira S;Kobota J.Technology for Production of High Quality Slab at High Speed Casting[A].Toronto:Iron and Steel Society,1992:75,409. |
| [9] | Zhang Q;Wang L;Wang X .Influence of Casting Speed Variation During Unsteady Continuous Casting on Non-Metallic Inclusions in IF Steel Slabs[J].ISIJ International,2006,46:1421. |
| [10] | 袁方明,王新华,李宏,任子平,张富强,孟劲松,孙群.不同浇铸阶段IF钢连铸板坯洁净度[J].北京科技大学学报,2005(04):436-440. |
| [11] | 曹晶,杨文,王新华,王万军,薛勇强.低碳铝脱氧钢连铸开浇阶段钢中非金属夹杂物的变化[J].钢铁,2011(06):37-39,44. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%