Research on Quality Control of 45# Steel Billet
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摘要: 针对某钢厂45#钢铸坯内部裂纹问题,对铸坯横断面不同位置处的夹杂物种类、数量、大小进行统计分析。结果表明:硫化物偏析形成的大型硫化物夹杂,以及铸坯进入空冷段后表面温度回升速度过大是造成铸坯内部裂纹的主要原因。通过二冷数值模拟计算及现场生产实践得出,采取优化连铸过程二冷制度的方法,可以对铸坯内夹杂物凝固行为加以控制,减少硫化物的偏析和大型硫化物的数量,实现对铸坯内部裂纹的控制。Abstract: According to the problem of internal cracks occurred on continuous casting billet at Nanjing Iron & Steel Co.,Ltd.,the species,quantity and size of inclusions on the different position of billet cross section were statistically analyzed.The results showed that: main causes of internal cracks are large sulfide inclusions and large temperature recovery.Through the secondary cooling numerical simulation and the production practice,it proved that the optimization of secondary cooling scheme can be used to control solidification performance of inclusions of billet,reduce segregation and quantity of sulfide in billet.So the internal cracks of billet can be controlled efficiently.
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Key words:
- 45# steel /
- billet /
- internal cracks /
- inclusion /
- secondary cooling scheme
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