Generally, 304 can only withstand the temperature of several hundred degrees, and it is easy to deform when the temperature is high (the degree of deformation depends on the thickness of the plate and the burned area). The reason why it rises when it is hot and shrinks when it is cold is that 32 1 is more resistant to high temperature than 304. At present, 3 10S is a good and commonly used high temperature resistant material, but it is expensive.