A high-temperature aging treatment process for a new type of ferritic heat-resistant steel used in thermal power plants

Abstract

The invention discloses a high-temperature ageing treatment process of novel ferrite type heat-resistant steel for a thermal power plant. The process comprises the following steps: S1, sampling: sampling ferrite type heat-resistant steel with the length of 1 M and the diameter of 30 to 55 cm, and performing surface cleaning before manufacturing to reduce the influence on the ferrite type heat-resistant steel by the subsequent medium and high temperature; and S2, in a vacuum high-temperature chamber, wherein high temperature is the simplest detection method and is applied to various fields. Under the existing process condition, the external influence factors of the ferrite type heat-resistant steel can be reduced, power consumption is low, the reliability is high and the manufacturing process is advanced; furthermore, the ferrite type heat-resistant steel is subjected to high-temperature heating by the tendency of gradually increasing the temperature of the vacuum high-temperature chamber; within the effective time, the change of the ferrite type heat-resistant steel is detected; and when the temperature of the vacuum high-temperature chamber reaches to the set maximum value, the temperature can be maintained to be unchanged effectively and continuously, the influence of enterprises is improved and good popularization value is achieved.

Description

technical field [0001] The invention relates to a ferritic heat-resistant steel, and more specifically relates to a high-temperature aging treatment process for a new type of ferritic heat-resistant steel used in a thermal power plant. Background technique [0002] As the operating time of thermal power plants increases year by year, the number of aging units in overdue service continues to increase, the creep damage of high-temperature components and the aging of materials are becoming more and more serious, and damage accidents occur from time to time, among which the superheater, reheater and other heating surface tubes burst. It is always the main cause of unplanned downtime of thermal power generating units. According to statistics, about 2 / 3 of boiler accidents in power plants are caused by pipe burst accidents on the heating surface. In recent years, the unit parameters have been continuously improved, and the failure accidents of the heating surface tubes of power p...

AI Technical Summary

Problems solved by technology

[0003] The traditional remaining life assessment method is not very reliable, especially for long-term remaining life prediction, the existing method may produce an error of more than one order of magnitude, and it is necessary to develop new and reliable ferritic heat-resistant steel high-temperature components for power stations The remaining life evaluation method must first have a deep understanding of the evolution of the microstructure and creep damage of relevant service materials in high-temperature and high-stress environments