摘 要 九钢炼钢厂因二次冷却工艺和连铸设备存在问题，小方坯产生角部裂纹、中间裂纹、压下裂纹和中心疏松。通过工艺优化和设备改进，使小方坯内部缺陷降到较低水平。
Corner cracks, middle cracks, pressure cracks and loose structure of billets were bought out because the worst Secondary Cooling crafts and the worst equipments of CC Abstract Billet in the steelmaking plant of Jiujiang Iron & Steel company. Optinizing-technologys and Transforming-quipments have already been taken, and the rejected rate of internal defects of the billet due to a relatively lower level. Key words Small Billet cracks of Billet Secondary Cooling
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