炉管服役过程的时效与渗碳导致大量碳化物的析出，其数量、大小与形态取决于服役温度和时间。
Aging and carburization during the service produced precipitation of carbides, the amount, size and forms of which depended on the service time and working temperature.
在上述实验结果的基础上，采用塑性滑移线场理论，提出了X60过热区在不同服役温度下的断裂机理。
On the basis of above experiment, fracture mechanism of X60 over-heated HAZ was given using the theory of slip line field.
结果表明，由于静态混合元件的使用明显降低了炉管表面温度，所以其服役寿命满足要求。
The investigation result shows that the surface temperature of tubes is remarkably reduced due to the static mixed units so that their service life meets the requirement.
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