Carbon steel tubes for heat exchangers at 800 degrees? !
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Just now, a manufacturer of heat exchangers told me that carbon steel pipes are still sufficient for this purpose! They also say that many large companies use it in the same way; no problem! I want to ask, won’t it crack over time? ! Or am I just too conservative? !
Can it hold up? 800-degree carbon steel becomes soft already
The problem is they also say it’s been in use for a long time already!
Incredible. Are it their sales staff rather than technical personnel who are talking nonsense?
It’s the model specification provided by the technical staff. Quoted by the sales staff. Sales told me.
It depends on the design temperature at the wall interface of the heat exchange tube; 800 degrees might be the temperature of the high-temperature medium. After heat exchange with the low-temperature medium, if the temperature of the tube wall remains below 450 degrees, carbon steel can certainly be used!
Take the steam generator used for hydrogen production as an example: the conversion outlet temperature is over 800 degrees, and the heat exchange tubes in such generators are made of 20g material, which is quite common
Oh, really? Nothing will go wrong?
How is that possible? The designed surface temperature of the heat exchange tubes is just over 400 degrees; carbon steel can withstand up to 450 degrees
Design temperature over 400? The exhaust gas temperature at my inlet is 800 degrees.
That’s not the case; the hot side is over 800 degrees, and the heat exchange tubes are in direct contact with temperatures of over 800 degrees. Heat exchange takes time – it requires a certain period for the temperature to drop.