Secondary Cooling Device
The secondary cooling device, otherwise called as spary-rinsing tubes, is mounted right below the crystallizer. The spray-rinsing tubes are in the shape of an arc. The secondary cooling device is comprised of nozzles of different model and flow rate, carriage, flexible tie-in, and fixation block. The fixation block and carriage are inside the secondary cooling room. The upper part of the arc-shape rinsing tubes is inserted into the flexible tie-ins while the tie-ins are sealed by the sealing ring.
The molten steel is turned into billets through first cooling in the crystallizer. The fresh billet shell is usually 8-15mm thick when it is withdrawn from the crystallizer, and it still has molten steel core inside the billet shell. For better solidification and withdrawal of the billets, the continuous casting machine is equipped with secondary cooling device and guidance device. The secondary cooling device is controlled automatically.

The cooling strength has a great influence on the billet quality, such as central star cracks, center segregation, and looseness.  
The secondary cooling device cools the billets from top to bottom, and the cooling strength is  from strong to weak. Different billet type should be cooled at different strength. The nozzles for the secondary cooling device are atomization ones with the advantage of high jetting speed, complete atomization, high cooling efficiency, large coverage area, and cooling evenness.

二次冷却装置
喷淋集管位于结晶器下方，喷淋管为弧型，在上装有不同型号，不同流量喷嘴，托架、活接头及固定块等。固定块及托架固定在二冷室内。弧型喷淋集管上部插入活接头内，活接头用密封圈进行密封，上部安装在托架上。
液态钢水在结晶器内经过一次冷却之后，铸坯被拉出结晶器，通常坯壳仅为8—15mm厚，钢坯的中心仍然是液态的高温钢水。二次冷却装置

为了使钢坯更快地凝固和顺利地拉坯，连铸设备配置有二次冷却和导向装置。二次冷却的控制形式为自动控制。
冷却强度的强弱，对铸坯的质量,诸如中心星状裂纹、中心偏析、疏松等缺陷，影响很大。
二次冷却装置通常二次冷却方式采用自上而下，冷却强度由强到弱的原则。
具体操作时应根据不同钢坯品种给予不同的冷却强度。方坯连铸机二冷的冷却喷嘴选用气雾喷嘴，该喷嘴具有喷射速度高、雾化充分、冷却效率高、覆盖面广且均匀等优点。