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center porosity of continuously cast product
met.
连铸坯中心疏松
(【技】连铸坯在凝固过程中,两边的柱状晶向中心生长,形成搭桥,从而阻止了钢水在铸坯中心部位自由流动,使钢水不能对因凝固收缩而形成的许多微孔进行补充。在钢水完全凝固后,这些空隙便在连铸坯中心部位形成中心疏松。在连铸过程中根据钢种选择适当的钢水过热度和拉坯速度以及采用合适的二次冷却强度和电磁搅拌技术,可以促进铸坯的柱状晶向等轴晶结构转变,减轻铸坯的中心疏松。)
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