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Corrosion Fatigue or Stress Assisted Corrosion of Boiler Tubes
2

Corrosion Fatigue or Stress Assisted Corrosion of Boiler Tubes

RE: Corrosion Fatigue or Stress Assisted Corrosion of Boiler Tubes

unclesyd;
Interesting technical information. It looks as though the industrial recovery boiler folks were at odds with EPRI (corrosion fatigue).

RE: Corrosion Fatigue or Stress Assisted Corrosion of Boiler Tubes

2
(OP)
metengr,
I still read into some of the statements that each side isn't totally convinced.

I first heard about corrosion fatigue in the late 80's and picked up on SAC much later. For awhile I didn't put the two together until much later. We were of the corrosion fatigue bent as we had more power boilers that HR boilers.

The statement that the morphology is similar to the problems in deaerators seems strange strange to me as the cracking we found in our deaerators didn't look like SAC at all.

In the early 90's I wrote several reports concerning a major problem we were having with external cracking on 30' dia reactor shells near the bottom flanges. I used the term Stress Assisted Corrosion to describe the mechanism without knowing or having seen any photomicrographs of SAC in boilers. I know now why the consulting firm challenged my terminology by stating that there is not water present therefore you can't have SAC.  Stranger still the morphology of my cracking/corrosion is very similar to the SAC in the article.


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