Study on crystallization and heat transfer performance of solid slag film in mold flux for titanium-bearing microalloyed steel

LIU Guoqi; XU Ziqian; SI Xulin; KONG Qichang; HUANG Weili; WANG Xingjuan

doi:10.7513/j.issn.1004-7638.2026.01.017

Volume 47 Issue 1

Feb. 2026

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LIU Guoqi, XU Ziqian, SI Xulin, KONG Qichang, HUANG Weili, WANG Xingjuan. Study on crystallization and heat transfer performance of solid slag film in mold flux for titanium-bearing microalloyed steel[J]. IRON STEEL VANADIUM TITANIUM, 2026, 47(1): 149-156. doi: 10.7513/j.issn.1004-7638.2026.01.017

Citation:

LIU Guoqi, XU Ziqian, SI Xulin, KONG Qichang, HUANG Weili, WANG Xingjuan. Study on crystallization and heat transfer performance of solid slag film in mold flux for titanium-bearing microalloyed steel[J]. IRON STEEL VANADIUM TITANIUM, 2026, 47(1): 149-156. doi: 10.7513/j.issn.1004-7638.2026.01.017

Citation:

LIU Guoqi, XU Ziqian, SI Xulin, KONG Qichang, HUANG Weili, WANG Xingjuan. Study on crystallization and heat transfer performance of solid slag film in mold flux for titanium-bearing microalloyed steel[J]. IRON STEEL VANADIUM TITANIUM, 2026, 47(1): 149-156. doi: 10.7513/j.issn.1004-7638.2026.01.017

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Study on crystallization and heat transfer performance of solid slag film in mold flux for titanium-bearing microalloyed steel

doi: 10.7513/j.issn.1004-7638.2026.01.017

LIU Guoqi^{1, 2
,},
XU Ziqian^{1, 2
,
,},
SI Xulin³,
KONG Qichang³,
HUANG Weili^{1, 2},
WANG Xingjuan³

1.
Technical Center, Delong Steel Co., Ltd., Xingtai 054009, Hebei, China
2.
Hebei Hot Rolled Plate and Strip Technology Innovation Center, Xingtai 054009, Hebei, China
3.
College of Metallurgy and Energy, North China University of Science and Technology, Tangshan 063210, Hebei, China

More Information

Received Date: 2025-12-09
Accepted Date: 2025-12-25
Rev Recd Date: 2025-12-18

Available Online: 2026-02-25

Publish Date: 2026-02-25

Abstract

Abstract

The solid slag film of mold flux is a key medium between the mold and the continuous casting slab. Based on the solid slag film of mold flux for Ti-containing microalloyed steel prepared by a slag film heat flux simulator, the physical properties of the slag film, such as thickness, porosity, and roughness, were analyzed. XRD, scanning electron microscopy (SEM), and mineral phase microscopy were used to analyze the crystallization performance of the slag film. In addition, the heat transfer properties of the slag film, including thermal resistance and heat flux density, were studied. The results show that the surface roughness of the slag film is formed at the initial stage of solidification of the solid slag film and is significantly affected by the temperature of the liquid slag. The solid slag film has a two-layer structure: glassy and crystalline, with perovskite as the main mineral phase. At the initial stage when the copper probe is immersed in the liquid slag, the heat flux density increases rapidly. When the water-cooled copper probe is immersed in the liquid slag for 13 seconds, the heat flux densities of the mold flux reach their maximum values, which are 0.988 MW·m⁻², 1.208 MW·m⁻², and 1.355 MW·m⁻² respectively. With the increase of the immersion time of the copper probe, the solid slag film gradually thickens, the thermal resistance increases, and the heat flux density decreases gradually.
- mold flux,
- slag film,
- crystallization,
- heat transfer,
- Ti-containing alloy steel

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References(15)

References

[1]	THRIDANDAPANI R R, MISRA R D K, MANNERING T, et al. Effect of vanadium addition on the microstructure and mechanical properties of low carbon micro-alloyed powder metallurgy steels[J]. Materials Science & Engineering A, 2006, 422(1-2), 287.
[2]	HUANG R K, ZHANG L F, JIANG R B, et al. Evolution of inclusions in ultra-low carbon Al-killed steel during continuous casting[J]. Steelmaking, 2020, 36(6): 39-45. (黄日康, 张立峰, 姜仁波, 等. 超低碳铝脱氧钢连铸过程钢中非金属夹杂物的演变[J]. 炼钢, 2020, 36(6): 39-45. HUANG R K, ZHANG L F, JIANG R B, et al. Evolution of inclusions in ultra-low carbon Al-killed steel during continuous casting[J]. Steelmaking, 2020, 36（6）: 39-45.
[3]	HANG Z D, FENG Y L. Research status and development trend of titanium microalloying steel[J]. Hot Working Technology, 2021, 50(6): 22-25. (杭子迪, 冯运莉. 钛微合金钢研究现状和发展趋势[J]. 热加工工艺, 2021, 50(6): 22-25. doi: 10.14158/j.cnki.1001-3814.20182770 HANG Z D, FENG Y L. Research status and development trend of titanium microalloying steel[J]. Hot Working Technology, 2021, 50（6）: 22-25. doi: 10.14158/j.cnki.1001-3814.20182770
[4]	HE Y M, HE S P. Analysis of lubrication and heat transfer function of mold flux[J]. Continuous Casting, 2021(2): 2-6. (何宇明, 何生平. 结晶器保护渣的润滑与传热控制功能剖析[J]. 连铸, 2021(2): 2-6. doi: 10.13228/j.boyuan.issn1005-4006.20200151 HE Y M, HE S P. Analysis of lubrication and heat transfer function of mold flux[J]. Continuous Casting, 2021（2）: 2-6. doi: 10.13228/j.boyuan.issn1005-4006.20200151
[5]	ZHU C Y, LIU C J, SHI P Y, et al. Effect of compositions of mold flux on crystalline phase[J]. Journal of Northeastern University(Natural Science), 2004(6): 559-562. (朱传运, 刘承军, 史培阳, 等. 保护渣成分对结晶矿相的影响[J]. 东北大学学报, 2004(6): 559-562. ZHU C Y, LIU C J, SHI P Y, et al. Effect of compositions of mold flux on crystalline phase[J]. Journal of Northeastern University(Natural Science), 2004（6）: 559-562.
[6]	WEN G H, TANG P, YANG B, et al. Simulation and characterization on heat transfer through mould slag film[J]. ISIJ Int, 2012, 52(7): 1179-1185. doi: 10.2355/isijinternational.52.1179
[7]	WEN G H, ZHU X B, TANG P, et al. Influence of raw material type on heat transfer and structure of mould slag[J]. ISIJ Int, 2011, 51(7): 1028-1032. doi: 10.2355/isijinternational.51.1028
[8]	YIN H B, YAO M. Analysis of the nonuniform slag film, mold friction, and the new cracking criterion for round billet continuous casting[J]. Metall Mater Trans B, 2005, 36: 857-864. doi: 10.1007/s11663-005-0087-z
[9]	HAN X L, ZHAO K, LIU L, et al. Research progress of metallurgical properties of fluorine-free continuous casting mold fluxes[J]. Materials Reports, 2022, 36(11): 187-193. (韩秀丽, 赵凯, 刘磊, 等. 无氟连铸保护渣冶金性能的研究进展[J]. 材料导报, 2022, 36(11): 187-193. doi: 10.11896/cldb.20100199 HAN X L, ZHAO K, LIU L, et al. Research progress of metallurgical properties of fluorine-free continuous casting mold fluxes[J]. Materials Reports, 2022, 36（11）: 187-193. doi: 10.11896/cldb.20100199
[10]	LI X Y, HE F, ZHAO C B, et al. Study on crystallization behavior and heat transfer performance of CaO-SiO₂ based continuous casting protective slag[J]. Journal of Wuhan University of Technology, 2023, 45(12): 28-32,73. (李晓阳, 何峰, 赵春宝, 等. CaO-SiO₂基连铸保护渣的析晶行为与传热性能研究[J]. 武汉理工大学学报, 2023, 45(12): 28-32,73. LI X Y, HE F, ZHAO C B, et al. Study on crystallization behavior and heat transfer performance of CaO-SiO₂ based continuous casting protective slag[J]. Journal of Wuhan University of Technology, 2023, 45（12）: 28-32,73.
[11]	LONG X, HE S P, WANG Q. Crystallization features of solid slag films of ultrahigh-basicity mold fluxes for continuous casting[J]. Journal of Iron and Steel Research, 2018, 30(1): 21-25. (龙潇, 何生平, 王谦. 超高碱度连铸保护渣固渣膜凝固和结晶行为特性[J]. 钢铁研究学报, 2018, 30(1): 21-25. doi: 10.13228/j.boyuan.issn1001-0963.20170073 LONG X, HE S P, WANG Q. Crystallization features of solid slag films of ultrahigh-basicity mold fluxes for continuous casting[J]. Journal of Iron and Steel Research, 2018, 30（1）: 21-25. doi: 10.13228/j.boyuan.issn1001-0963.20170073
[12]	LONG X, HE S P, WANG Q. Factors influencing roughness of solidified mold flux film for peritectic steel continuous casting[J]. Journal of Iron and Steel Research, 2017, 29(7): 551-555. (龙潇, 何生平, 王谦. 包晶钢连铸保护渣固渣膜粗糙度影响因素[J]. 钢铁研究学报, 2017, 29(7): 551-555. doi: 10.13228/j.boyuan.issn1001-0963.20160283 LONG X, HE S P, WANG Q. Factors influencing roughness of solidified mold flux film for peritectic steel continuous casting[J]. Journal of Iron and Steel Research, 2017, 29（7）: 551-555. doi: 10.13228/j.boyuan.issn1001-0963.20160283
[13]	GAO H X. Review of surface roughness measurement methods[J]. Modern Manufacturing Technology and Equipment, 2021, 57(9): 145-146. (高海霞. 表面粗糙度测量方法综述[J]. 现代制造技术与装备, 2021, 57(9): 145-146. GAO H X. Review of surface roughness measurement methods[J]. Modern Manufacturing Technology and Equipment, 2021, 57（9）: 145-146.
[14]	HAO Y H, FAN B X, LI H, et al. Effect of erosion angles on roughness of tempered glass and float glass and analysis of three-dimensional morphology[J]. Journal of Materials Science and Engineering, 2021, 39(3): 407-414. (郝贠洪, 范宝鑫, 李慧, 等. 冲蚀角度对建筑用钢化玻璃和普通玻璃喷砂磨损粗糙度的影响及三维分析[J]. 材料科学与工程学报, 2021, 39(3): 407-414. HAO Y H, FAN B X, LI H, et al. Effect of erosion angles on roughness of tempered glass and float glass and analysis of three-dimensional morphology[J]. Journal of Materials Science and Engineering, 2021, 39（3）: 407-414.
[15]	WEN G H. Influence of raw material type on heat transfer and structure of mould slag[J]. ISIJ international, 2011, 51(7): 1028-1032. doi: 10.2355/isijinternational.51.1028