Analysis of the growth process of crystallized slag rim in 430 stainless steel mold flux

WANG Xingjuan; SONG Yuanlong; ZHU Liguang; ZHANG Jianyu; SI Xulin; ZHENG Xuelong

doi:10.7513/j.issn.1004-7638.2025.04.017

Volume 46 Issue 4

Aug. 2025

Turn off MathJax

Article Contents

Article Navigation > IRON STEEL VANADIUM TITANIUM > 2025 > 46(4): 127-134

WANG Xingjuan, SONG Yuanlong, ZHU Liguang, ZHANG Jianyu, SI Xulin, ZHENG Xuelong. Analysis of the growth process of crystallized slag rim in 430 stainless steel mold flux[J]. IRON STEEL VANADIUM TITANIUM, 2025, 46(4): 127-134. doi: 10.7513/j.issn.1004-7638.2025.04.017

Citation:

WANG Xingjuan, SONG Yuanlong, ZHU Liguang, ZHANG Jianyu, SI Xulin, ZHENG Xuelong. Analysis of the growth process of crystallized slag rim in 430 stainless steel mold flux[J]. IRON STEEL VANADIUM TITANIUM, 2025, 46(4): 127-134. doi: 10.7513/j.issn.1004-7638.2025.04.017

Citation:

PDF( 3768 KB)

Analysis of the growth process of crystallized slag rim in 430 stainless steel mold flux

doi: 10.7513/j.issn.1004-7638.2025.04.017

1.
School of Metallurgy and Energy, North China University of Science and Technology, Tangshan 063210, Hebei, China
2.
College of Materials and Engineering, Hebei University of Science and Technology, Shijiazhuang 050018, Hebei, China

More Information

Received Date: 2024-11-21
Available Online: 2025-08-31
Publish Date: 2025-08-31

Abstract

Abstract

A certain steel plant using imported mold flux for 430 stainless steel often results in excessively large slag rims that affect the quality of the cast slab. To clarify the reasons for the enlargement of the slag rings, this study employed a slab mold slag film heat flux simulator to create a crystallized slag rim for ultra-low carbon protection slag at 1450 °C. SEM microstructural analysis was used to explore the growth process of the slag rim. Additionally, thermodynamic simulations using Factsage were conducted and compared with XRD experimental results. The findings revealed that high-melting-point phases dicalcium silicate, wollastonite, feldspar, and gunite preferentially crystallized and condensed on the mold wall, forming the initial crystallized slag rim (35%). Subsequently, lower-melting-point combeite adhered to this layer (20%). Lastly, cuspidine containing minor nepheline gradually deposited on the existing slag rim (45%).Through the analysis of this process, the study elucidated the formation mechanism of the crystallized slag rims in 430 stainless steel mold flux, providing a theoretical basis for controlling the slag rims growth.
- 430 stainless steel,
- crystalline slag rim,
- microstructure,
- growth mechanism

FullText(HTML)

References(19)

References

[1]	ZHAI J, LI H, CHEN F T, et al. Effect of mold flux on edge depression defects of 430 stainless steel billet[J]. China Metallurgy, 2022, 32(5): 102-108. (翟俊, 李欢, 陈法涛, 等. 保护渣对430不锈钢铸坯边部凹陷缺陷的影响[J]. 中国冶金, 2022, 32(5): 102-108. ZHAI J, LI H, CHEN F T, et al. Effect of mold flux on edge depression defects of 430 stainless steel billet[J]. China Metallurgy, 2022, 32（5）: 102-108.
[2]	MA J P, LI H. Effect of mold flux on surface quality of 430 stainless steel billet[J]. Continuous Casting, 2022(4): 29-33. (马骏鹏, 李欢. 保护渣对430不锈钢铸坯表面质量的影响[J]. 连铸, 2022(4): 29-33. MA J P, LI H. Effect of mold flux on surface quality of 430 stainless steel billet[J]. Continuous Casting, 2022（4）: 29-33.
[3]	LEI Z L, ZHANG D D, MEI F, et al. Study on decrease of recarburization of ultra-low-carbon steel with ultra low carbon slag[J]. Continuous Casting, 2018, 43(5): 49-53. (雷志亮, 张东栋, 梅峰, 等. 超低碳保护渣控制钢水增碳的研究[J]. 连铸, 2018, 43(5): 49-53. LEI Z L, ZHANG D D, MEI F, et al. Study on decrease of recarburization of ultra-low-carbon steel with ultra low carbon slag[J]. Continuous Casting, 2018, 43（5）: 49-53.
[4]	MENG X Y, WANG Y, ZHU M Y, et al. Analysis on influences of mold slag rim on channel pressure, oscillation marks and slag consumption[J]. Ansteel Technology, 2015(6): 1-5, 19. (孟祥宇, 汪宇, 朱苗勇, 等. 结晶器渣圈对渣道压力、振痕及渣耗影响的分析[J]. 鞍钢技术, 2015(6): 1-5, 19. doi: 10.3969/j.issn.1006-4613.2015.06.001 MENG X Y, WANG Y, ZHU M Y, et al. Analysis on influences of mold slag rim on channel pressure, oscillation marks and slag consumption[J]. Ansteel Technology, 2015（6）: 1-5, 19. doi: 10.3969/j.issn.1006-4613.2015.06.001
[5]	GRIEVESON P, BAGHA S, MACHINGAWUTA N, et al. Physical properties of casting powders: Part 2 Mineral logical constitution of slags formed by powders[J]. Iron Making and Steel Making, 1998, 15(14): 181-186.
[6]	KROMHOUT J, A. Mould powders for the hight speed continuous casting of cteel[D]. Delft: Delft University of Tenchnology, 2011.
[7]	JIANG W B, WEN G H, JIANG J, et al. Research status on mechanism of formation and growth of slag rim and affecting factors[J]. Continuous Casting, 2021(2): 7-13. (蒋文波, 文光华, 江婧, 等. 保护渣渣圈形成长大机理及影响因素研究现状[J]. 连铸, 2021(2): 7-13. JIANG W B, WEN G H, JIANG J, et al. Research status on mechanism of formation and growth of slag rim and affecting factors[J]. Continuous Casting, 2021（2）: 7-13.
[8]	JIANG W B. Formation and control of slag rim in mold for continuous casting[D]. Chongqing: Chongqing University, 2022. (蒋文波. 连铸结晶器保护渣渣圈形成及控制[D]. 重庆: 重庆大学, 2022. JIANG W B. Formation and control of slag rim in mold for continuous casting[D]. Chongqing: Chongqing University, 2022.
[9]	FENG W M, XUE J H, XING G C, et al. Development of mold flux for continuous casting of Cr13 type martensitic stainless steel square billet[J]. Special Steel, 2023, 44(3): 53-58. (冯为民, 薛井恒, 邢国成, 等. Cr13型马氏体不锈钢方坯连铸保护渣的开发[J]. 特殊钢, 2023, 44(3): 53-58. FENG W M, XUE J H, XING G C, et al. Development of mold flux for continuous casting of Cr13 type martensitic stainless steel square billet[J]. Special Steel, 2023, 44（3）: 53-58.
[10]	GUO W J, ZENG Y N, DI G X, et al. Thin slab protective slag on crystallization behavior[J]. Journal of North China University of Science and Technology, 2024, 46(3): 10-20. (郭文婧, 曾亚南, 邸高翔, 等. 超高速薄板坯保护渣组分对析晶行为影响的热力学研究[J]. 华北理工大学学报, 2024, 46(3): 10-20. GUO W J, ZENG Y N, DI G X, et al. Thin slab protective slag on crystallization behavior[J]. Journal of North China University of Science and Technology, 2024, 46（3）: 10-20.
[11]	DI T C, WANG X J, LIU Z X, et al. Analysis on formation and growth mechanism of 430 stainless steel mold powder slag-bonding rim and control measures[J]. Special Steel, 2022, 43(5): 63-67. (邸天成, 王杏娟, 刘增勋, 等. 430不锈钢用连铸保护渣渣圈形成长大机理分析和控制措施[J]. 特殊钢, 2022, 43(5): 63-67. doi: 10.3969/j.issn.1003-8620.2022.05.013 DI T C, WANG X J, LIU Z X, et al. Analysis on formation and growth mechanism of 430 stainless steel mold powder slag-bonding rim and control measures[J]. Special Steel, 2022, 43（5）: 63-67. doi: 10.3969/j.issn.1003-8620.2022.05.013
[12]	YAN X P. Research on the influence of fluorine and boron on crystallization behavior of continuous casting slag film[D]. Tangshan: North China University of Science and Technology, 2022. (闫晓鹏. 氟及硼对连铸保护渣渣膜析晶行为影响规律研究[D]. 唐山: 华北理工大学, 2022. YAN X P. Research on the influence of fluorine and boron on crystallization behavior of continuous casting slag film[D]. Tangshan: North China University of Science and Technology, 2022.
[13]	WANG Z C. Heat transfer and lubrication behaviors of slag film for continuous casting of typical steel grades[D]. Changsha: Central South University, 2023. (王子超. 典型钢种连铸保护渣渣膜传热与润滑行为[D]. 长沙: 中南大学, 2023. WANG Z C. Heat transfer and lubrication behaviors of slag film for continuous casting of typical steel grades[D]. Changsha: Central South University, 2023.
[14]	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]. Wuhan University of Technology News, 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]. Wuhan University of Technology News, 2023, 45（12）: 28-32, 73.
[15]	WANG S H, WANG Z H, LI X N, et al. Synthesis of anorthite powder by solid-state method and its application in transparent glaze[J]. Chinese Ceramics, 2024, 60(5): 66-72. (王少华, 王子晗, 李小女, 等. 固相法合成钙长石粉体及其在透明釉中的应用研究[J]. 中国陶瓷, 2024, 60(5): 66-72. WANG S H, WANG Z H, LI X N, et al. Synthesis of anorthite powder by solid-state method and its application in transparent glaze[J]. Chinese Ceramics, 2024, 60（5）: 66-72.
[16]	DU F, WANG Y, LIANG X P, et al. Experimental research on slag film simulation of continuous casting mould fluxes[J]. Journal of Process Engineering, 2009, 9(1): 197-201. (杜方, 王雨, 梁小平, 等. 连铸保护渣渣膜模拟实验研究[J]. 过程工程学报, 2009, 9(1): 197-201. doi: 10.3321/j.issn:1009-606X.2009.z1.041 DU F, WANG Y, LIANG X P, et al. Experimental research on slag film simulation of continuous casting mould fluxes[J]. Journal of Process Engineering, 2009, 9（1）: 197-201. doi: 10.3321/j.issn:1009-606X.2009.z1.041
[17]	WEN Y L. Experimental study on sintering properties and melting speed of continuous casting mould fluxes[D]. Chongqing: Chongqing University, 2016. (温亚磊. 连铸保护渣烧结性能和熔化速度的实验研究[D]. 重庆: 重庆大学, 2016. WEN Y L. Experimental study on sintering properties and melting speed of continuous casting mould fluxes[D]. Chongqing: Chongqing University, 2016.
[18]	LI Q P, WANG Z, DUAN Z R, et al. Kinetic study of NaF gas formation during mold flux melting based on different fluorides by experimental and computational methods[J]. steel research int. 2024.
[19]	HAO Z Q, CHEN W Q, CARSTEN L, et al. Study on molten slag layer and slag film of mould flux used in slab casting of stainless steel 1Cr17[J]. Special Steel, 2009, 30(3): 16-18. (郝占全, 陈伟庆, CARSTEN L, 等. 不锈钢1Cr17板坯连铸过程中保护渣液渣层及渣膜的研究[J]. 特殊钢, 2009, 30(3): 16-18. doi: 10.3969/j.issn.1003-8620.2009.03.006 HAO Z Q, CHEN W Q, CARSTEN L, et al. Study on molten slag layer and slag film of mould flux used in slab casting of stainless steel 1Cr17[J]. Special Steel, 2009, 30（3）: 16-18. doi: 10.3969/j.issn.1003-8620.2009.03.006