介绍了在清洗复杂运行系统时，在不破坏该系统设备的情况下，实现分段清洗工艺的可行性。
It is introduced the study of feasible plan of chemical cleaning of complex system in run without damage of the system equipment.
螺杆采用合金钢材料经特殊工艺制成，使用寿命长；分段式组合螺杆，适用原料广泛，产品更多样。
Screw is made of alloy steel with long life. It is assembled by several units freely for more applied material and colorful products.
在控制冷却过程中，除开始冷却温度对试验钢的性能影响较大外，分段冷却工艺参数对试验钢性能的提高也起很大作用。
During controlled cooling, not only start cooling temperature affects mechanical properties of test steel, but also subsection cooling mode can increase mechanical properties of test steel.
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