In order to avoid boiler accident and ensure safe operation of boiler

the importance of correct material selection for main steam pipe of power plant boiler is pointed out. The fracture and leakage accident of main steam pipe elbow of power station boiler in a chemical fiber factory is analyzed by using the correct material elbow and straight section pipe around the accident

using macroscopic inspection

wall thickness measurement

spectrum analysis and metallographic structure analysis It is pointed out that severe over temperature operation will lead to serious pearlite spheroidization

severe graphitization and local obvious creep cracks in the metal structure of the elbow of the main steam pipe of the carbon steel

which will lead to the final failure of the main steam pipe.