RANKING OF THE MECHANICAL CHARACTERISTICS OF STEELS OF STEAM PIPELINES OF THERMAL POWER PLANTS BY THEIR SENSITIVITY TO IN-SERVICE DEGRADATION

We analyze the mechanical properties of heat-resistant steels after long-term operation at thermal power plants. It is shown that the operating conditions (high temperature and pressure of hydrogenating corrosive media, thermal and mechanical stresses) negatively affect their structural-mechanical state. We generalize the results of evaluation of the mechanical characteristics of steels after their operation in various elements (straight sections, pipe bends, and welded joints) of the main steam pipelines of thermal power plants under the joint influence of the in-service factors. On this basis, we rank the analyzed steels according to their sensitivity to high-temperature hydrogen degradation.

Automated summary

The mechanical properties of heat-resistant steels after long-term operation at thermal power plants are negatively affected by high temperature, pressure of hydrogenating corrosive media, and thermal and mechanical stresses. By analyzing the mechanical characteristics of steels in various elements of the main steam pipelines under the joint influence of in-service factors, the steels are ranked according to their sensitivity to high-temperature hydrogen degradation.