改善高碳大鋼胚偏析問題之連鑄技術開發

Up-grading Casting Technology for Centerline Segregation Improvement in High-Carbon Steel Blooms

林冠儒(K. J. Lin) ； 塞強科(Dmitry Sediako) ； 陳永昆(Y. K. Chen) ； 馮復安(F. A. Feng) ； 陳奇宏(C. H. Chen) ； 王文賢(W. H. Wang)

《鑛冶：中國鑛冶工程學會會刊》 40卷1期 (1996/03) Pp. 33-42

https://doi.org/10.30069/MM.199603_40(1).0004

摘要

鑄胚中心偏析是高碳線在伸線過程中發生中心爆裂或斷線問題的主要原因。為供應下游客戶品質更穩定之高碳線材產品。本文針對鑄胚中心偏析的問題，研究其連鑄製程，開發低偏析度高碳大鋼胚之連鑄生產技術。研究方法是利用鑄道內測溫方式測量鑄胚溫度變化，探討鑄胚在鑄機內的冷卻凝固狀態，並建立可靠的熱傳計算模式。而後針對1082大鋼胚之偏析問題，藉由降低鑄胚偏析之連鑄技術開發，研擬出最適當的製程條件。研究證實，經現場鑄機應用新的緩冷噴水設計，調整F－EMS之操作及實施鑄胚輕軋作業等技術後，高碳鑄胚之偏析及其引發之線材斷線問題已獲得大幅度的改善。

關鍵字

連續鑄造 ； 大鋼胚 ； 偏析

並列摘要

Centerline segregation is the main reason for cuppy fracture during drawing of high-carbon prestressed concrete wire. To supply the product with better drawing quality for customers, this work has been devoted to upgrading the continuous casting technology to produce high carbon steel bloom with low centerline segregation. The reliable computation model based on in-strand temperature measurement of continuous bloom has been established in order to elucidate the solidification proceeding of the shell. Furthermore, casting techniques for segregation reduction including water cooling pattern, EMS and crater-end soft reduction of bloom have been successfully developed. As the results, the new casting technology implementation provides an essential improvement of bloom centerline segregation and wire cuppy fracture.

並列關鍵字

Continuous Casting ； Bloom ； Segregation