Sage Journals: Discover world-class research

Abstract

Heavy reduction technology of the bloom is realised without modifying the hydraulic equipment if a crown roll is used. Experimental results of GCr15 showed that the ratio of reduction amount to broadening amount increased from 2.0 (flat roll reduction) to 4.4 (crown roll reduction), which indicated that reduction efficiency is significantly improved. It is evident that the enriched molten steel in the mushy zone will be squeezed out if the crown roll heavy reduction technology is adopted. Thus, centre segregation and V segregation is suppressed or even eliminated. The average centre carbon segregation index is reduced from 1.74 to 1.06, and negative segregation may occur. Meanwhile, the centre shrinkage cavity is clearly decreased and the centre porosity grade is remarkably reduced to 1.0. The calculation results of elastic–plastic FEM model showed that heavy reduction at the solidification end is very beneficial to improve the centre shrinkage cavity.

Get full access to this article

View all access options for this article.

References

Flemings

MC.

Our understanding of macrosegregation, Past and present. ISIJ Int. 2000;40(9):833–841. doi: 10.2355/isijinternational.40.833

Domitner

Kharicha

et al. Modeling the effects of strand surface bulging and mechanical soft reduction on the macrosegregation formation in steel continuous casting. Metall Mater Trans A. 2014;45(3):1415–1434. doi: 10.1007/s11661-013-2060-9

Takubo

Matsuoka

Miura

et al. 2015 Technical innovation and fine production technology exchange conference of continuous casting equipment; 2015, 307–318.

Hiraki

Yamanaka

Shirai

et al. Development of new continuous casting technology (PCCS) for very thick plate. Mater Jpn. 2009;48(1):20–22. doi: 10.2320/materia.48.20

Kawamoto

Recent development of steelmaking process in Sumitomo metals. J Iron Steel Res Int. 2011;18(S2):28–35.

Yim

Kwon

4th International Conference on Continuous Casting of Steel in Developing Countries; 2008, 52–58.

Yim

Won

Park

et al. Continuous cast slab and method for manufacturing the same [P]. EP, US 8245760 B2. 2012.

Qian

Chen

et al. Project practice of heavy reduction technology of billet. Continuous Casting. 2016;41(1):48–55

Won

Thomas

BG.

Simple model of microsegregation during solidification of steels. Metal Mater Trans A. 2001;32A:1755–1767. doi: 10.1007/s11661-001-0152-4

10.

Meng

Thomas

BG.

Heat-transfer and solidification model of continuous slab casting: CON1D. Metall Mater Trans B. 2003;34B(5):685–705. doi: 10.1007/s11663-003-0040-y

11.

Han

Cheng

Mei

et al. Optimization of soft reduction process for continuous thick slab casting. Adv Mater Res. 2014;881–883:1558–1561.

12.

JQ.

et al. Research on high temperature mechanical properties of GCr15 bloom. Iron Steel Vanadium Titanium. 2010;31(3):34–37

13.

Okimori

Nishihara

Fukunaga

et al. Development of soft reduction techniques for preventing center porosity occurence in large size bloom. Tetsu Hagane. 1994;80:T120–T123

14.

Isobe

Maede

Syukuri

et al. Development of soft reduction technology using crown rolls for improvement of centerline segregation of continuously cast bloom. Tetsu Hagane. 1994;80(1):42–47. doi: 10.2355/tetsutohagane1955.80.1_42

15.

Moon

Lee

et al. Effect of the roll surface profile on centerline segregation in soft reduction process. ISIJ Int. 2012;52(7):1266–1272. doi: 10.2355/isijinternational.52.1266

Effects of heavy reduction technology on internal quality of continuous casting bloom

Abstract

Get full access to this article

References