Pipe

2 cases · 2 images

Crevice Corrosion in a Subsea System — Aspect Before Analysis

Capture method: Nital Etched Micrography by SEM clear all

Pipe — sub-branches

Centrifugally Cast Pipe 3Longitudinal Seam Welded Pipe 6Seamless Pipe 11

Results

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Micrography of the weld metal in the last bead, presenting previous austenite columnar grains, primary ferrite in the grain boundaries, some regions of ferrite with aligned second phases and acicular ferrite.
58
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ML00153 / Jan.2019
X52 in a Tubular Structure
M - CMn SteelP - Seamless PipeAp - StructureCd - Qualified
Cm - Nital Etched Micrography by SEMDf - Weld Metal
Micrography of the seam welded joint, autogenous. The localized dissolution occurrs exactly at the weld metal that presents a bainitic structure and Vickers (100g) microhardness values about 230HV, compared to the heat affected zone presenting average of 202 HV and the base metal presenting average of 180HV.
59
VIEW
ML00140 / May.2019
Preferential Corrosion of Pipe Seam Weld
M - Low Carbon SteelP - Longitudinal Seam Welded PipeAp - ShipCd - Preferential Dissolution
Cm - Nital Etched Micrography by SEMDf - Welded Joint