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Q. Use of High temperature material in Superheaters?
Typically superheaters and reheaters provide service lives of approximately 15 years (i.e. half the expected service life of the boiler itself) due to increased metal temperatures in the finishing legs of the tubes. Since the metal temperatures are the greatest in this vicinity, it may be that the fire-side oxidation and corrosion potentials are also the highest.
Typical materials of construction for the superheater and reheater sections of the boiler include carbon steel for the inlet where steam temperatures may be £ 800°F (425°C), and Cr-Mo steels for steam temperatures of up to 950°F (510°C) and where metal temperatures may be 1075°F (580°C). Austenitic stainless steels may be required at the outlets where steam temperatures can be over 1000°F (540°C) and metal temperatures may be as high as 1200°F (650°C).
Several suggestions for increasing the useful service life of superheaters and reheaters are as follows:
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