Abstract
Through methods, such as microscope analysis, chemical analysis, hardness analysis, metallography examination etc, the causes resulting in reheater tube cracking of 300MW station boiler have been analyzed. The result indicates this reheater tube cracking is reheat crack. The higher sensitive temperature in operating, excessive welding residual stress are the primarily inducement of cracking. In welding repair, the measures , such as replacing the material ,lower welding heat input, preheat treatment and so on, were taken. The welding repair succeeded greatly.
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