連鑄收尾胚縮管之缺陷成因與改善研究

Improving Consolidating Shrinkage Pipe for End Slab of Continuous Casting

蔡德昌(D.C. Tsai) ； 林冠儒(K.J. Lin) ； 曾名輝(M.H. Zeng) ； 黃柏偉(B.W. Huang)

《鑛冶：中國鑛冶工程學會會刊》 62卷4期 (2018/12) Pp. 70-75

https://doi.org/10.30069/MM.201812_62(4).0005

摘要

連鑄縮管主要於完鑄收尾時，形成於鑄胚尾端，其與收尾製程關係密切。主要形態為凝固縮管成漏斗狀，頂端有數處架橋，底端則為細長之管狀孔洞。為改善扁鋼胚收尾切長，本研究利用HotTop冷卻模式，並搭配收尾胚之熱傳模擬計算，找出適化的連鑄收尾模式，以提前關噴水方式，將尾端1m比水量由0.65調降至0.3L/Kg，建立尾部緩冷機制以提高鋼液補充，減少縮管長度，實機應用結果顯示，平均收尾切長由2.2m降至1.9m，收尾胚質量初步獲得改善。

關鍵字

縮管 ； 收尾胚 ； 連鑄 ； 凝固

並列摘要

In continuous casting, a consolidating shrinkage tube of end slab was formed at the end of the casting process. The solidification shrinkage tube was funnel-shaped with several bridges at the top and slenderly tubular holes at the bottom. The Hot-Top cooling model was used in this study to optimize the cutting length of the slab. We conducted heat transfer simulations of the ending process to define the optimal conditions for the casting process. The water spray system was turned off in advance and the water ratio within 1 m of the end of the slab was decreased from 0.65 to 0.3 L/kg. A slow cooling mechanism for the tail of the slab was implemented to increase liquid steel feeding and reduce the length of consolidating shrinkage tube. Practical application of the improvements showed that the average cutting length was reduced from 2.2 to 1.9 m and the quality of the end slab was improved.

並列關鍵字

Shrinkage ； End Slab ； Continuous casting ； Solidification