Boiler

2 cases · 3 images

Crevice Corrosion in a Subsea System — Aspect Before Analysis

Microstructure: Bainite Capture method: Naked Eye or Stereoscope clear all

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Throught wall cracking of the waterwall tube at the leakage position, thick edged, The external surface of the tube was grounded to remove the membrane and the cracking is associated to the tube attachement.
242
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ML00163 / Jun.2020
Corrosion Fatigue of a Boiler Waterwall Tube
M - Low Carbon SteelP - Seamless tubeAp - BoilerCd - Corrosion Fatigue
Cm - Transverse Section AspectDf - Thick-edged rupture
The macrography of a longitudinal section shows that the tube did not present local thinning in any region, but the internal and external scales are evidenced. The external surface (OD) is to the top of the figure and the internal surface (ID) is to the bottom of the figure.
124
VIEW
ML00107 / Dec.2017
Carburized 9Cr1MoV Superheater Tube
M - Heat Resistant SteelP - Seamless tubeAp - BoilerCd - Carburization
Cm - NItal Etched MacroDf - Longitudinal Section

More from these cases

ML00163 — Corrosion Fatigue of a Boiler Waterwall TubeM - Low Carbon SteelP - Seamless tubeAp - BoilerCd - Corrosion Fatigue
Macrography of the transverse section of the tube, in a position where the cracking was not yet through wall. The internal tube surface shows multiple corrosion fatigue cracks, parallel, under the weld of the membrane, probably related to the cold side of the tube (the cracks opened to the boiler outside). The external side of the tube presenting a small crack at the margem of the weld, suggesting also the action of thermal stresses.
214
VIEW
ML00163 / Jun.2020
Corrosion Fatigue of a Boiler Waterwall Tube
M - Low Carbon SteelP - Seamless tubeAp - BoilerCd - Corrosion Fatigue
Cm - NItal Etched MacroDf - Multiple cracks