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Initially Solidified Shell Growth of Hypo-peritectic Carbon Steel in Continuous Casting Mold
ISIJ International ( IF 1.8 ) Pub Date : 2020-09-25 , DOI: 10.2355/isijinternational.isijint-2019-766
Hideo Mizukami 1 , Yoshihisa Shirai 1 , Sei Hiraki 2
Affiliation  

The occurrence of longitudinal surface cracks in hypo-peritectic carbon steel slabs depends largely on the cooling capacity of the mold and the flow velocity of molten steel below the meniscus. The influence of both flow velocity of the molten steel below the meniscus and the heat flux in the copper mold were examined using continuous casting tests and numerical simulation of the molten steel flow. The casting speed was fixed, and the meniscus flow velocity was controlled by adjusting the port size of the submerged entry nozzle. The molten steel flow velocity was predicted by a three-dimensional unsteady-state numerical simulation. Heat flux in the copper mold was calculated based on temperature readings from thermocouples arranged in the direction of both the mold width and mold length. When the difference in flow velocity of molten steel in the mold width direction became large, longitudinal surface cracks occurred in the central region of the slab. In these cases, the heat flux below the meniscus in the mold width direction was not constant. Small holes were drilled along the central region of the mold width. This decreased both the heat flux and tensile strength of the central region of the slab width, and successfully reduced the occurrence of longitudinal surface cracks.



中文翻译:

连铸结晶器中次包晶碳钢的初始凝固壳生长

包晶的碳素钢铸坯的纵向表面裂纹的出现在很大程度上取决于铸模的冷却能力和弯月面以下的钢水流速。使用连续铸造试验和钢水流动的数值模拟,研究了弯月面以下的钢水流速和铜模中的热通量的影响。固定浇铸速度,并通过调节浸入式喷嘴的口径来控制弯月面流速。通过三维非稳态数值模拟来预测钢水的流速。根据沿模具宽度和模具长度方向排列的热电偶的温度读数计算出铜模具中的热通量。当钢水在结晶器宽度方向上的流速差变大时,在板坯的中央区域出现纵向表面裂纹。在这些情况下,在模具宽度方向上弯月面以下的热通量不是恒定的。沿模具宽度的中心区域钻小孔。这降低了板坯宽度中心区域的热通量和拉伸强度,并成功减少了纵向表面裂纹的发生。

更新日期:2020-09-25
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