Numerical Simulation of Flow and Solidification Behavior of Medium Mn steel in Thin Slab Mold

doi:10.20057/j.1003-8620.2024-00123

Abstract

Abstract: The flow and solidification characteristics of molten steel in thin slab continuous casting mold of medium Mn steel with section of 1 500 mm×90 mm were studied by numerical simulation. The melting and mixing behavior of reactive mold slag was analyzed. The results showed that in case of casting speed of 5 m/min and immersion depth of 300 mm， the temperature of the medium Mn steel fluctuated greatly around about a quarter of the width surface of the lower layer. Due to the slow heat transfer of the shell， the solidified shell of narrow face at the mold outlet was thin and its thickness was only 7.73 mm. The slag rim formed in the continuous casting process of medium Mn steel was slightly smaller in size and mainly consisted of the initial slag layer. The solid slag film was formed by mixing the initial layer and the reaction layer at different stages. The initial solidification of the shell was easy to be uneven due to the change of the slag ingredient in the upper part of the mold.

Key words: Medium Mn steel, Thin Slab, Mold, Mold Slag

摘要： 采用数值模拟方法对断面尺寸为1 500 mm×90 mm的中锰钢薄板坯连铸结晶器内钢液流动与凝固特征进行了研究，分析了反应性保护渣的熔化与混合行为。研究结果表明，在拉速为5 m/min、浸入深度为300 mm的案例下，中锰钢在结晶器中下部约宽面四分之一附近的温度波动较大，因坯壳传热慢导致在结晶器出口处窄面的坯壳较薄，厚度仅为7.73 mm。对比低碳钢渣圈形状发现，中锰钢连铸过程中形成的渣圈尺寸略小，并以初始层成分为主，固态渣膜经不同阶段的反应层与初始层混合形成，结晶器上部因保护渣成分变化易导致坯壳初始凝固不均匀。

关键词: 中锰钢, 薄板坯, 结晶器, 保护渣

CLC Number:

TF777.7

Tian　Runyu, Song　Bingjun, Peng　Zhongyuan, Qiu　Yarong, Kong　Lingzhong, Yang　Jie. Numerical Simulation of Flow and Solidification Behavior of Medium Mn steel in Thin Slab Mold[J]. Special Steel, 2025, 46(1): 48-53.

田润雨, 宋秉钧, 彭中源, 邱雅蓉, 孔令种, 杨杰. 薄板坯结晶器内中锰钢流动与凝固行为数值模拟[J]. 特殊钢, 2025, 46(1): 48-53.

References

［1］赵征志，陈伟健，高鹏飞，等. 先进高强度汽车用钢研究进展及展望［J］. 钢铁研究学报， 2020， 32（12）： 1059-1076.
［2］白韶斌，牛伟强，肖文涛，等. 中锰钢的研究进展及未来研究展望［J］. 热加工工艺， 2022， 51（14）： 1-9.
［3］ Hu J， Li X Y， Meng Q W， et al. Tailoring retained austenite and mechanical property improvement in Al–Si–V containing medium Mn steel via direct intercritical rolling［J］. Materials Science and Engineering： A， 2022， 855： 143904.
［4］汪水泽，高军恒，吴桂林，等. 薄板坯连铸连轧技术发展现状及展望［J］. 工程科学学报， 2022， 44（4）： 534-545.
［5］明章生，栗克建，曹鹏军，等. 带钢无头连铸连轧技术发展现状［J］. 河北冶金， 2024（2）： 1-8.
［6］朱苗勇. 高拉速连铸过程传输行为特征及关键技术探析［J］. 钢铁， 2021， 56（7）： 1-12.
［7］李中原，赵九洲，平行板型薄板坯连铸结晶器中钢液流动、凝固及溶质分布的三维耦合数值模拟［J］. 金属学报， 2006， 42（2）： 211-217.
［8］王晓红，沈巧珍，朱必炼，等. CSP连铸结晶器内三维流场与温度场的数值模拟［J］. 武汉科技大学学报（自然科学版）， 2006， 29（4）： 335-338.
［9］胡　硕，王朋飞，朱立光，等. 漏斗形薄板坯结晶器内铸坯传热分析［J］. 钢铁， 2017， 52（2）： 33-37.
［10］ Yang J， Wang Y N， Ruan X M， et al. Effects of manganese content on solidification structures， thermal properties， and phase transformation characteristics in Fe-Mn-C steels［J］. Metallurgical and Materials Transactions B， 2015， 46（3）： 1353-1364.
［11］马晓莉，于建刚，陈翠欣，等. 成分对高锰合金钢组织和变形特性的影响［J］. 特殊钢， 2008， 29（4）： 19-21.
［12］ Kim M S， Lee S W， Cho J W， et al. A reaction between high Mn-high Al steel and CaO-SiO2-type molten mold flux： Part I. composition evolution in molten mold flux［J］. Metallurgical and Materials Transactions B， 2013， 44（2）： 299-308.
［13］ Yang J， Zhu M Y. Evolution of compositions and properties of CaO–SiO2 based mold flux for continuous casting high Mn steel［J］. ISIJ International， 2016， 56（12）： 2191-2198.
［14］ Wu T， He S P， Zhu L L， et al. Study on reaction performances and applications of mold flux for high-aluminum steel［J］. MATERIALS TRANSACTIONS， 2016， 57（1）： 58-63.
［15］ Yang J， Wang L J， Li Y， et al. Modeling of flux reaction and mixing in continuous casting mold of medium Mn steel［J］. Metallurgical and Materials Transactions B， 2022， 53（3）： 1516-1525.
［16］张剑君. 高品质钢薄板坯连铸关键技术研究［D］. 北京：钢铁研究总院， 2019.
［17］ Yang J， Cai Z Z， Chen D F， et al. Characteristics of slag infiltration in high-Mn steel castings［J］. Metallurgical and Materials Transactions B， 2019， 50（2）： 1104-1113.
［18］张晓峰. CSP结晶器钢液流动及传热行为对薄板坯表面纵裂的影响［D］. 北京：北京科技大学， 2015.

[1]	Duan　Fuchun, Wang　Yuping, Zhu　Zhiqiang. Optimization of Electromagnetic Parameters for the 3rd-generation FC MOLD [J]. Special Steel, 2025, 46(1): 126-133.
[2]	Su Mengmeng, Chen Wei, Tang Jiali, Zhong Liangmei, Xu Xiangyu, Fu Jianxun. Continuous Cooling Phase Transformation Behavior of 40Cr13 Plastic Mold Steel [J]. Special Steel, 2024, 45(5): 113-118.
[3]	Ma Shaochen, Yuan Zhipeng, Zhang Caijun. Shear Thinning Behavior and Surface Properties of Mold Flux for Thin Thickness Slabs at High-casting Speed [J]. Special Steel, 2024, 45(5): 76-84.
[4]	Yang Yang, Li Zhongbo, Bie Jiabao. Development of Extra-thick Plate 12Cr2Mo1VR（H）for Hydrogenation Reactor with 200 mm Thickness [J]. Special Steel, 2024, 45(2): 24-29.
[5]	Liu　Qilong, Deng　Yong, Li　Huagang, Wei　Rujun, Cao　Chenghu, Zhang　Min. Numerical simulation and Process Practice of Mold Electromagnetic Stirring for IF Steel Slab [J]. Special Steel, 2023, 44(6): 83-88.
[6]	Tang　Zhenglei, Xu　Shaopu, Wang　Fuming, Li　Hongyang, Chen　Xi, Zhang　Tao. Simulation and Optimization of Casting Parameters for Producing Laminar Tear Resistant Extra-thick Plate by The New Type of Water-cooled Die Casting [J]. Special Steel, 2023, 44(4): 22-27.
[7]	Hu　Jinzhao. Influence of Additive Composition of Protective Slag on Surface Quality of M2 High Speed Steel Mold Ingot [J]. Special Steel, 2023, 44(3): 59-63.
[8]	Feng　Weimin, Xue　Jingheng, Xing　Guocheng, Ren　Fei, Wang　Hongpo, Wang　Yu. Development of Mold Flux for Continuous Casting of Cr13 Type Martensitic Stainless Steel Square Billet [J]. Special Steel, 2023, 44(3): 53-58.
[9]	Wang　Shisong, Zhang　Xubin, Wang　Yunbo, Jin　Hebin, Wang　Wei, Tang　Qing. Study on the Absorption of TiN by the Mold Slag of High Titanium Welding Wire Steel [J]. Special Steel, 2023, 44(3): 46-52.
[10]	Li　Shengyan, Liu　Xiaolin, Dong　Fujun, Liao　Sangsang, Sun　Lefei. Process Practice of the On-line Solid Solution of Superior Mirror Surface Plastic Mold Steel P80 [J]. Special Steel, 2023, 44(3): 98-103.
[11]	Lin Peng , Xu Zhengzhou , Yin Chuanlei , Zhang Hongcai , Zhai Wanli , Xu Guangle. Defects Analysis and Process Optimization of 150 mm x 150 mm Casting Billet of 60Si2Mn Spring Steel [J]. Special Steel, 2022, 43(5): 59-62.
[12]	Di Tiancheng , Wang Xingjuan , Liu Zengxun , Zhai Jun , Li Huan , Piao Zhanlong. 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.
[13]	Yang Wenxuan, Wang Yong, Gao Jinguo, Liu Wei, Yang Shufeng , Li Jingshe. Water Hydraulic Model Test on Liquid Level Fluctuation and Slag Entrapment Behavior of 1 500 mm x 230 mm Slab Mold and Application [J]. Special Steel, 2022, 43(2): 21-26.
[14]	Hou Yu, Geng Xin, Li Boyang, Li Xiaokai and Jiang Zhouhua. Thermodynamic Analysis on Mineralogical Phase Precipitation in Cooling Process of Continuous Casting Mold Flux for Fe-Ni-Cr Alloy [J]. Special Steel, 2022, 43(1): 1-5.
[15]	Han Xiuli, Yan Xiaopeng, Liu Lei, Zhao Kai, Wang Cheng , Du Liang. Research Progress on Heat Transfer Characteristics of Mold Flux Film in Continuous Casting Mold [J]. Special Steel, 2021, 42(6): 6-13.