主梁下挠变形的主要原因是受热引起的最大复合应力超过许用值，达到了屈服极限值，强度不满足要求。
The main reason of the main beam down deflection was that the most complex stress exceeded the admissible value and achieved the yield limit value.
这种失效的原因在这些局部可能是由于机械和热应力的双重作用超过了辊子自身的材质的抗屈服强度所导致的，并且在进一步冷却中还会进一步扩展。
These cracks occur when the combination of mechanical and thermal stresses within these local areas pass over the yield strength of the barrel material and are exaggerated during subsequent cooling.
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