Conventional inspection methods of furnace tubes adopt the lossmaking methods of on-site tube cutting and laboratory analysis. The non-destructive hysteresis evaluation technology is based on the fact that the material's hysteresis behavior is very sensitive to the material's microstructure changes and stress conditions. By observing the changes of the characteristic parameters of hysteresis during the service process of furnace tubes, the microscopic damage degree of carburizing creep of furnace tubes can be effectively evaluated and the residual life can be predicted.

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