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What should we pay attention to when carbon steel and carbon-manganese steel are used for a long time at temperatures above 425°C? Why?
When carbon steel and carbon-manganese steel are used for a long time at temperatures above 425°C, attention should be paid to the problem of graphitization tendency. Because when these materials are used for a long time at temperatures higher than 425°C, they will tend to graphitize due to the decomposition of cementite, which will reduce the strength, plasticity and impact value of the material. The steel will become obviously brittle, just like gold and jade on the outside and flocculation on the inside. This is a very dangerous problem for the equipment in use, so these materials are generally not used.
You can choose heat-resistant steel, such as 15CrMoR.