Initial Evaluation of Microstructure and Mechanical Properties of SA213 T22 Superheater Tube in a Bituminous Coal-Fired Power Plant
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Abstract
A comprehensive understanding of microstructural and mechanical property changes is essential for assessing superheater tube conditions. This article presents the initial monitoring of microstructural and mechanical property change of SA213 T22 utilized in a coal-fired boiler. The monitoring involves visual examination, chemical composition test, micrographic investigation, tensile and hardness test. Results show that exposure to the elevated temperature and ash deposition promotes oxidizing environment, subsequently leading to thermal oxidation and decarburization.The combination of both degradation results in the decreased strength and harness as well as the increased elongation in the SA213 T22 steel tube exposed to the superheat condition for three years. Regular inspections are recommended to ensure the availability of the tubes. Additionally, metallurgical replica testing is advised for the microstructural evaluation of the superheater tube.
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