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Which materials are used for Super heater tubes?

Which materials are used for Super heater tubes? Correct Answer Chromium Molybdenum

Superheater is made of coils of tubes forming parallel tube circuits connected between heaters. The superheater tubes are made of high temperature strengths special alloy steels such of chromium molybdenum. The coils are heated by the heat of combustion gas during their passage from furnace to the chimney.

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