Abstract
The embrittlement of carbon steel seamless tube of a power plant boiler after extended service of 34,000 h at 346 °C under 15.68 MPa has been studied by scanning Auger microprobe. The segregation of N at grain boundaries and also the segregation of P at grain boundaries and part of the cleavage planes after long term service caused the embrittlement of carbon steel and resulted in the explosion of the boiler feedwater pipes. The N Al atomic ratio can be used to determine the ageing embrittlement tendency of carbon steel during long time service at 350 °C, and when the N Al atomic ratio is approximately 1 or less, the embrittlement can be avoided.
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