Why does carbon steel soften at 800 degrees? ?
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In a certain coking unit, carbon steel was used as the material for the furnace tubes. When the unit started operating, the temperature inside the furnace reached over 800 degrees, which caused the furnace tubes to leak and catch fire. What is the reason why carbon steel leaks and catches fire at temperatures above 800 degrees? ? ? Does it soften due to high stress at 800 degrees, or does the intergranular structure change at temperatures above 800 degrees? ? ? Causes softening and leakage? ?
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Carbon steel should not be used at temperatures above 425 degrees for extended periods, otherwise it will graphitize.
Just look up the iron-carbon alloy phase diagram and you’ll know!