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Crevice Corrosion in a Subsea System — Aspect Before Analysis

Microstructure: Bainite Standard: API Capture method: Scanning Electron Microscope clear all

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Forging 1Pipe 3Rolled Plate 1Tube 1

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Image by scanning electron microscopy of the metallurgically bonded interface of the internally cladded pipe. It is a seamless pipe in a low alloy steel X70 cladded by welding overlay of Alloy 625 (by automatic GTAW process). The region is a detail of the interface inside the Ni alloy weld metal, presenting columnar grains and intragranular preciptation. The pipe was heat treated before bending (solution annealing) and after bending (quenching and tempering to meet X70 grade). The microhardness of this region is higher than the value obtained out of this region, in the overlay.
657
VIEW
ML00132 / May.2018
Seamless Pipe Overlaid with Alloy 625
M - LAS / Ni AlloyP - Seamless PipeAp - Oil and GasCd - Welding
Cm - Electrolytic Etch Micrography by SEMDf - Clad Interface
Micrographic detail of the bainitic structure at the HAZ of the carbon steel plate, by scanning electron microscopy.
40
VIEW
ML00052 / Apr.2017
Cold Cracks in API 5CT L80 Tube Welded to a Structural Part
M - Low Alloy SteelP - Seamless tubeAp - OffshoreCd - Welding Defect
Cm - Nital Etched Micrography by SEMDf - Heat Affected Zone

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ML00132 — Seamless Pipe Overlaid with Alloy 625M - LAS / Ni AlloyP - Seamless PipeAp - Oil and GasCd - Welding
Image by scanning electron microscopy of the interface of the internally cladded pipe. It is a seamless pipe in low alloy steel X70 overlaid with Alloy 625 (by automatic GTAW process). The region is a detail in the side of the Ni alloy weld metal, presenting transgranular precipitation. The pipe was heat treated before bending (solution annelaing) and after bending (quenching and tempering to meet X70 grade). The microhardness of this region is higher than the value obtained out of this region, in the overlay.
43
VIEW
ML00132 / May.2018
Seamless Pipe Overlaid with Alloy 625
M - LAS / Ni AlloyP - Seamless PipeAp - Oil and GasCd - Welding
Cm - Electrolytic Etch Micrography by SEMDf - Clad Interface
Image by scanning electron microscopy of the interface of the internally cladded pipe, seamless low alloy steel X70 overlaid with Alloy 625 (by automatic GTAW process) and presenting maximum iron content of 5% at the thickness of 3 mm (the qualified thickness).
37
VIEW
ML00132 / May.2018
Seamless Pipe Overlaid with Alloy 625
M - LAS / Ni AlloyP - Seamless PipeAp - Oil and GasCd - Welding
Cm - Electrolytic Etch Micrography by SEMDf - Clad Interface
ML00052 — Cold Cracks in API 5CT L80 Tube Welded to a Structural PartM - Low Alloy SteelP - Seamless tubeAp - OffshoreCd - Welding Defect
Micrographic detail of the ferritic structure in the weld metal close to the low alloy steel tube, by scanning electron microscopy. The weld metal presents a typical aspect for high strenght weld metal (100% acicular ferrite).
32
VIEW
ML00052 / Apr.2017
Cold Cracks in API 5CT L80 Tube Welded to a Structural Part
M - Low Alloy SteelP - Seamless tubeAp - OffshoreCd - Welding Defect
Cm - Nital Etched Micrography by SEMDf - Weld Metal
Micrographic detail of the fusion line of the carbon steel plate, by scanning electron microscopy, showing the bainitic structure at the HAZ and ferritic structure in the weld metal.
34
VIEW
ML00052 / Apr.2017
Cold Cracks in API 5CT L80 Tube Welded to a Structural Part
M - Low Alloy SteelP - Seamless tubeAp - OffshoreCd - Welding Defect
Cm - Nital Etched Micrography by SEMDf - Fusion Line
Micrographic detail of the ferritic structure in the weld metal close to the carbon steel plate, by scanning electron microscopy. The weld metal presents a typical aspect for low strenght weld metal (grain boundary and primary ferrite, plus acicular ferrite).
30
VIEW
ML00052 / Apr.2017
Cold Cracks in API 5CT L80 Tube Welded to a Structural Part
M - Low Alloy SteelP - Seamless tubeAp - OffshoreCd - Welding Defect
Cm - Nital Etched Micrography by SEMDf - Weld Metal
Micrographic detail of the fusion line of the low alloy steel tube, by scanning electron microscopy, showing the martensitic structure at the HAZ and acicular ferritic structure in the weld metal.
29
VIEW
ML00052 / Apr.2017
Cold Cracks in API 5CT L80 Tube Welded to a Structural Part
M - Low Alloy SteelP - Seamless tubeAp - OffshoreCd - Welding Defect
Cm - Nital Etched Micrography by SEMDf - Fusion Line
Micrographic detail of the martensitic structure at the HAZ of the low alloy steel tube, by scanning electron microscopy.
40
VIEW
ML00052 / Apr.2017
Cold Cracks in API 5CT L80 Tube Welded to a Structural Part
M - Low Alloy SteelP - Seamless tubeAp - OffshoreCd - Welding Defect
Cm - Surface Aspect by SEMDf - Heat Affected Zone

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