低碳鋼連鑄板坯表層凝固鉤的特征

張旭彬; 張立峰; 王皓; 王勝東; 王強強; 楊文

doi:10.13374/j.issn2095-9389.2017.02.013

低碳鋼連鑄板坯表層凝固鉤的特征

doi: 10.13374/j.issn2095-9389.2017.02.013

張旭彬¹,
張立峰^1, ,,
王皓²,
王勝東^1,2,
王強強¹,
楊文¹

1) 北京科技大學冶金與生態工程學院, 北京 100083
2) 首鋼京唐鋼鐵聯合有限責任公司煉鋼部, 唐山 063200

基金項目:

國家自然科學基金資助項目（51274034，51334002，51404019）

詳細信息

中圖分類號: TF777.1
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出版歷程
- 收稿日期: 2016-04-20

Subsurface hooks in continuous casting slabs of low-carbon steel

1) School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China
2) Steelmaking Department, Shougang Jingtang United Iron & Steel Co., Ltd., Tangshan 063200, China

摘要

摘要: 對不同澆鑄條件下的低碳鋼連鑄板坯進行了凝固鉤（Hook）的特征研究，根據凝固鉤的形貌概括了凝固鉤的不同類型，統計了凝固鉤周圍氣泡和夾雜物的分布，討論了不同澆鑄參數對鑄坯凝固鉤深度的影響，并通過Bikerman方程和彎月面凝固理論對凝固鉤的不同特征進行了解釋.結果表明：按形貌可將凝固鉤分為完整葉狀、雙凝固鉤、彎曲截斷型和二次凝固型四種類型，其中二次凝固型的凝固鉤出現的概率最高為46.8%，而完整葉狀、彎曲截斷型和二次凝固型的凝固鉤出現概率分別為25.3%、7.6%和6.3%；研究發現，凝固鉤周圍的夾雜物數量明顯多于其他區域的夾雜物數量，說明凝固鉤能夠捕獲結晶器內上浮的夾雜物；對比不同澆鑄參數發現，采用結晶器電磁制動裝置（FC-Mold）、減小結晶器水口浸入深度、增大澆鑄拉速均能夠減小凝固鉤的深度；Bikerman方程的計算結果和彎月面凝固理論能在機理上解釋凝固鉤的形貌特征.
- 低碳鋼 /
- 連鑄 /
- 板坯 /
- 振痕 /
- 凝固鉤
Abstract: Hook characteristics in continuous casting slabs of low-carbon steel under different casting conditions were investigated. According to hook morphology, hooks were classified into different types. Distributions of bubbles and inclusions near hooks were analyzed, and the influence of casting parameters on hook depth was discussed. Bikerman's equations and theory of meniscus solidification were used to explain the various hook morphology. Results show that on the basis of morphology hooks can be classified into four types, including whole-leaf type, double-hook type, truncated type and re-solidified type. The percentage of re-solidified type is the highest (46.8%), and the percentages of whole-leaf type, truncated type and double-hook type are respectively 25.3%, 7.6% and 6.3%. Studies demonstrate that the inclusion number near hooks is obviously higher than that in other zone, indicating floating inclusions in the mold can be captured by hooks. Comparing different casting parameters, the use of FC-Mold, the decrease of the submerged depth of the submerged entry nozzle (SEN) and the increase of casting speed can reduce the hook depth. Calculated results of Bikerman's equation and theory of meniscus solidification can explain the formation mechanisms of different hook morphologies.
- low-carbon steel /
- continuous casting /
- slabs /
- oscillation marks /
- solidified hooks

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參考文獻(19)

[1]	Takeuchi H, Matsumura S, Hidaka R, et al. Effect of mould oscillation conditions on oscillation marks of stainless steel casts. Tetsu-to-Hagané, 1983, 69(2):248
[2]	Szekeres E. Overview of mold oscillation in continuous casting. Iron Steel Eng, 1996, 73(7):29
[3]	Emi T, Nakato H, Tachibana R, et al. Influence of physical and chemical properties of mold powders on the solidification and occurrence of surface defects of strand cast slabs//Natl Open Hearth Basic Oxygen Steel Conference 61st Proceeding. Chicago, 1978:350
[4]	Sengupta J, Thomas B G, Shin H J, et al. A new mechanism of hook formation during continuous casting of ultra-low-carbon steel slabs. Metall Mater Trans A, 2006, 37(5):1597
[5]	Harada S, Tanaka S, Misumi H, et al. A formation mechanism of transverse cracks on CC slab surface. ISIJ Int, 1990, 30(4):310
[6]	Takeuchi E, Brimacombe J K. The formation of oscillation marks in the continuous casting of steel slabs. Metall Trans B, 1984, 15(3):493
[7]	Yamamura H, Mizukami Y, Misawa K. Formation of a solidified hook-like structure at the subsurface in ultra low carbon steel. ISIJ Int, 1996, 36(Suppl):S223
[8]	Sengupta J, Shin H J, Thomas B G, et al. Micrograph evidence of meniscus solidification and sub-surface microstructure evolution in continuous-cast ultralow-carbon steels. Acta Mater, 2006, 54(4):1165
[9]	Sengupta J, Thomas B G. Effect of a sudden level fluctuation on hook formation during continuous casting of ultra-low carbon steel slabs//Modeling of Casting, Welding, and Advanced Solidification Processes XI (MCWASP XI) Conference. Opio, 2006:727
[10]	Lee G G, Thomas B G, Kim S H, et al. Microstructure near corners of continuous-cast steel slabs showing three-dimensional frozen meniscus and hooks. Acta Mater, 2007, 55(20):6705
[11]	Lee G G, Shin H J, Kim S H, et al. Prediction and control of subsurface hooks in continuous cast ultra-low-carbon steel slabs. Ironmaking Steelmaking, 2009, 36(1):39
[12]	Sjoden O, Venini M. Use of electromagnetic equipment for slab and thin slab steel continuous caster. Metalurgija, 2007, 13(1):11
[15]	Idogawa A, Sugizawa M, Takeuchi S, et al. Control of molten steel flow in continuous casting mold by two static magnetic fields imposed on whole width. Mater Sci Eng A, 1993, 173(1):293
[16]	Vander V G F. Wetting agents in metallography. Mater Charact, 1995, 35(2):135
[17]	Esaka H, Kuroda Y, Shinozuka K, et al. Interaction between argon gas bubbles and solidified shell. ISIJ Int, 2004, 44(4):682
[18]	Ren Y, Wang Y F, Li S S, et al. Detection of non-metallic inclusions in steel continuous casting billets. Metall Mater Trans B, 2014, 45(4):1291
[19]	Bikerman J J. Physical Surfaces. New York:Elsevier, 2012
[20]	Mahapatra R B, Brimacombe J K, Samarasekera I V, et al. Mold behavior and its influence on quality in the continuous casting of steel slabs:Part I. Industrial trials, mold temperature measurements, and mathematical modeling. Metall Trans B, 1991, 22(6):861
[21]	Ackermann P, Heinemann W, Kurz W. Surface quality and meniscus solidification in pure chill cast metals. Arch Eisenhüttenwes, 1984, 55(1):1