【摘要】 为标定240 mm×240 mm断面50CrV弹簧钢方坯的凝固末端位置,确定凝固末端电磁搅拌的合理位置,对湘钢方坯连铸机开展射钉试验,结果表明,弹簧钢方坯综合凝固系数为26.8 mm/min^1/2,在0.8 m/min和1.0 m/min拉速下,凝固终点位置分别为距弯月面16.2 m和19.8 m处,凝固末端电磁搅拌适宜位置为距弯月面7.18 m和8.84 m处。基于射钉试验建立凝固传热模型,利用模型研究了不同连铸工艺参数下的铸坯凝固特征,据此可对现行连铸参数进行优化与修正,充分发挥凝固末端电磁搅拌作用,减轻中心偏析,改善铸坯质量,研究结果对现场实际具有一定指导意义。更多还原

【Abstract】 In order to calibrate the solidified end position of the 50CrV spring steel billet with 240 mm×240 mm section and determine the reasonable position of electromagnetic stirring at the solidification end,the nail shooting experiment was carried out on the Xianggang billet continuous caster.The results showed that the comprehensive solidification coefficient of the spring steel billet was 26.8 mm/min^1/2.When the casting speed are at 0.8 m/min and 1.0 m/min,respectively,The end positions of solidification are 16.2 m and 19.8 m from the meniscus surface,respectively,and the suitable positions of electromagnetic stirring at the end of solidification are 7.18 m and 8.84 m from the meniscus surface.Based on the verification of the nail test,the solidification heat transfer model was established,and had been used to studied the solidification characteristics of the casting billet under different continuous casting process parameters.The model predication could be used to optimize and correct the existing continuous casting parameters so that the electromagnetic stirring effect at the solidification end could be fully exerted and the central segregation should be reduced,consequently the quality of the casting billet could be improved.更多还原