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Crevice Corrosion in a Subsea System — Aspect Before Analysis

Microstructure: Austenite Standard: API Capture method: Electrolytic Etch Micrography by SEM clear all

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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.
656
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

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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.
42
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).
36
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