棒材穿水冷却装置的基本原理是什么？

在精轧机后设有一个由数个水冷箱组成的可调水冷段，对棒材进行急剧冷却，使棒材表面形成马氏体*，在随后的温度恢复过程中，芯部热量散出对表面马氏体*可产生回火作用，轧钢设备谁家好，结果棒材表面层为回火马氏体，芯部为细粒珠光体及索氏体*。这种*结构使棒材屈服****限和韧性****，并具有良好的可焊性。

What is the basic principle of the bar water cooling device?

After the finishing mill， there is an adjustable water cooling section of several water cooling boxes. The rod material is cooled sharply to form martensite structure. During the subsequent temperature recovery process， the heat of the core can produce tempering on the surface martensite， and the surface layer of the rod is tempered martensite， the core is fine pearlite and Soxhlet body. This structure improves the yield limit and toughness of bars，轧钢设备， and has good solderability.

采用控制轧制工艺时，为了****原始奥氏体晶粒过分长大，一般采用较低的加热温度和开轧温度。由于开轧温度高，变形后的奥氏体晶粒会发生再结晶而细化，如在这个阶段停止变第八节控制轧制技术形，轧件即随温度下降而产生相变。

In order to prevent the original austenite grain growing too much，轧钢设备生产， the lower heating temperature and rolling temperature are generally adopted in the rolling process. Due to the high rolling temperature， the austenite grain after the deformation will be recrystallized and refined. For example， the eighth section rolling technology is stopped at this stage， and the phase change is produced as the temperature drops.