Will the hair dryer burn red all the time and burn the steel pipe?

You'd better stop dreaming. Although your idea is good, it is impossible to happen in reality because there is an overheat protection switch in the hair dryer. If the temperature is high, it will automatically trip to protect against power failure. It is impossible to break the steel pipe after you burn it red with this hair dryer. Unless you modify it, the hair dryer will bypass the protection switch and be directly connected to the power supply, but if you keep burning red and the wires overheat, your electricity meter will trip. I see, so your idea is good and can't exist in reality.