铜连铸坯中裂纹和孔洞的形成机理和工艺控制研究

分析了SCR连铸连轧生产线铜连铸坯中常见的裂纹和孔洞缺陷类型,探讨了在连铸过程中铜铸坯中裂纹和孔洞缺陷的形成机理和可能原因,并提出了减少裂纹和孔洞缺陷的工艺控制措施。研究认为,铜连铸坯中裂纹的形成与铸坯的高温力学性能、铸坯的应变行为、凝固冶金行为和铸造机设备运行状态有关;孔洞的形成主要与熔铸过程中的水蒸汽、浇铸速度、涂炭层不均匀以及浇铸温度不稳定有关;通过对铜原料的处理和熔炼气氛、涂炭工艺和铸造轮干燥工艺的控制以及铜液的过热度、浇铸速度和冷却效果的控制,可以有效减少铜连铸坯中孔洞和裂纹缺陷的出现。

Study on the Formation Mechanism and Technology Control of the Cracks and Holes in the Continuous Casting Copper Bar

The formation mechanism and technology control of common cracks and holes in the continuous cast copper bar by SCR continuous casting and rolling process are discussed in this paper. The results show that the cracks in the copper bar are influenced by the water vapor,the casting speed,the thickness of the carbon coating thickness and the casting temperature in the continuous casting process. The holes in the copper bar are influenced by the high temperature performance ,the strain behavior,the solidification behavior of the cast bar and the running state of the casting machine. The number of cracks and holes can be reduced by the control of the cop- per material,the melting atmosphere,the thickness of carbon coating thickness,the casting temperature,the casting speed,the cooling condition etc.