Zhang Jianyu,Wang Xingjuan,Zhu Liguang,et al.The Influence of Swirl Nozzle on the Flow Field in the Bloom Mould and the Interface Behavior of Steel Slag[J].Special Steel,2025,46(02):55-61.
Zhang Jianyu,Wang Xingjuan,Zhu Liguang,et al.The Influence of Swirl Nozzle on the Flow Field in the Bloom Mould and the Interface Behavior of Steel Slag[J].Special Steel,2025,46(02):55-61. DOI: 10.20057/j.1003-8620.2024-00216.
The Influence of Swirl Nozzle on the Flow Field in the Bloom Mould and the Interface Behavior of Steel Slag
In order to improve the quality of vertical continuous casting 40Mn2 square bloom , a four-quarter tangential swirl nozzle was proposed, using a Particle image velocimetry technique, the molten steel flow and slag interface behavior at different casting speeds and nozzle immersion depths were studied in a steel plant's bloom mold with 410 mm × 560 mm vertical continuous casting section. The results show that the fluidity of the mold powder at the interface of steel slag is poor when the depth of the nozzle is 90 mm and the casting speed is 0.25 m/min, and the slag entrapment occurs when the casting speed is 0.35 m/min and 0.45 m/min,When the immersion depth of the nozzle is 100 mm, the fluidity of the mold powder at the interface of steel slag is poor while the casting speed is 0.25 m/min, and at 0.35 m/min casting speed , the inclusion will float upwards. The interface of steel slag is active and there is no slag entrapment, and slag entrapment will occur at 0.45 m/min casting speed . When the immersion depth of the nozzle is 110 mm, the fluidity of the mold powder at the interface of steel slag is poor while the casting speed is 0.25 m/min. When the casting speed is 0.45 m/min, the slag entrapment will occur. When the casting speed is 0.35 m/min, no slag entrapment will occur, compared with the same casting speed and 100 mm immersion depth of nozzle, it is unfavorable to the floating of inclusions. Combined with the actual production practice, the optimum operating parameters of the vertical continuous casting bloom mold are the depth of nozzle immersion 100 mm and casting speed 0.35 m/min.
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陈远清 . 连铸大圆坯宏观碳偏析的控制研究 [D]. 北京 : 钢铁研究总院 , 2019 .
SGRO A , RINALDI M , ACCARDO G . A New Benchmark in Special Steel Casting:New Twin-Strand Vertical Caster at Posco Specialty Steel,Korea: Proceedings of the 6 th International Congress on the Science and Technology of Steelmaking(Ⅰ) [C]. Beijing : The Chinese Society for Metals , 2015 : 5 .
Zhang L W , Wang Z L , Xu C J , et al . A vertical continuous casting machine for large blooms [J]. Ironmaking & Steelmaking , 2019 , 46 ( 8 ): 742 - 746 .
Odenthal H J , Pfeifer H , Lemanowicz I , et al . Simulation of the submerged energy nozzle-mold water model system using laser-optical and computational fluid dynamics methods [J]. Metallurgical and Materials Transactions B , 2002 , 33 ( 2 ): 163 - 172 .
Chen J , Su Z J , Li D G , et al . Flow behavior in the slab mold under optimized swirling technology in submerged entry nozzle [J]. ISIJ International , 2018 , 58 ( 7 ): 1242 - 1249 .
Jiang D B , Peng X X , Ren Y , et al . Water modeling on slag entrainment in the slab continuous casting mold [J]. Metallurgical Research & Technology , 2022 , 119 ( 6 ): 601 .
Hakamura H , Kohira S , Kubota J , et al . Technology for production of high quality slab at high speed casting [C]// Steelmaking Conference Proceedings . 1992 , 75 : 409 - 415 .
Teshima T , Osame M , Okimoto K , et al . Improvement of surface property of steel at high casting speed [J]. Iron and Steel Society , Inc., Continuous Casting., 1992 : 115 - 122 .
Kubota J , Okimoto K , Suzuki M , et al . Mechanism of level fluctuation and mold powder catching in slab continuous casting at high speeds [C]//IISC. The Sixth International Iron and Steel Congress . 1990 , 3 : 356 - 363 .
Yuan Q , Vanka S P , Thomas B G , et al . Computational and experimental study of turbulent flow in a 0.4-scale water model of a continuous steel caster [J]. Metallurgical and Materials Transactions B , 2004 , 35 ( 5 ): 967 - 982 .