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Super heater tubes are made up of what type of material?

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Super heater tubes are made up of what type of material?

(a) Copper alloy

(b) Carbon steel

(c) Titanium alloy

(d) Iron

I have been asked this question in exam.

I would like to ask this question from Feed Water and Steam Generation System, Working of Thermal Power Plant topic in section Steam Power Plant of Energy Engineering

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The correct choice is (b) Carbon steel

For explanation I would say: The steam generated in the boiler is superheated in super heater tubes made of carbon steel for operating at a steam temperature of up to 950°F and carbon molybdenum steel for operating at steam temperature of 1050°F and stainless steel for operating temperature of 1200°F. The tubes of super heater have an outside diameter which ranges from 25mm to 64mm.

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