Sampling and Analysis

30 cases · 35 images

Crevice Corrosion in a Subsea System — Aspect Before Analysis

Capture method: NItal Etched Macro clear all

Sampling and Analysis — sub-branches

Heat Affected Zone 1Longitudinal Section 10Low Mag 1Transverse Section 6Weld Metal 1Weld Repair 1Welded Joint 15

Results

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Macrography of the welded joint between the forging and the pipe, showing it was welded in a narrow gap, indicating by the arrow the location of the crack at the margin of the weld, in the forging side.
129
VIEW
ML00178 / Jan.2022
Cold cracks in Cr-Mo Welded Forging
M - CrMo SteelP - ForgingAp - O&G Well DrillingCd - Welding Defect
Cm - NItal Etched MacroDf - Welded Joint
Identification of the regions of metallographies of the base metal, heat affected zone (HAZ) and weld metal. Locations in the root, in the center of the thickness and close to the tube OD (external surface).
118
VIEW
ML00177 / Dec.2021
Cr-Mo Seam Welded Tube
M - CrMo SteelP - Longitudinally Seam WeldedAp - Fired HeaterCd - Not according to spec
Cm - NItal Etched MacroDf - Welded Joint
Macrography of the longitudinal section of the valve body, at the cracked position close to the actuator hole. The valve body is 40 mm thick and at this position it is possible to see that there are two regions where the body was welded, close to the inner surface (bottom) and at the close to the outer surface (top). The through wall crack presented a branch aspect close to the repair in the ID and a straight aspect when propagating from the repair.
55
VIEW
ML00162 / Apr.2020
Valve Body Crack Growth from Weld Defects
M - Low Alloy Medium Carbon QTP - Valve BodyAp - O&G Well DrillingCd - Fatigue Induced by a Defect
Cm - NItal Etched MacroDf - Weld Repair
Macrography of a wheel section close to the tread, where the material receives a localized surface hardening by quenching and tempering. The average hardness at the surface is 346HB and in the center is 196HB. The wheel was in operation for a long time and the analyzed part is at the wheel tread.
902
VIEW
ML00158 / Feb.2020
Surface Hardened Carbon Steel Wheel
M - High Carbon SteelP - WheelAp - TransportationCd - Removed From Service
Cm - NItal Etched MacroDf - Transverse Section
Failure of a Prestressed Concrete Steel Strand
3
VIEW
ML00155 / Jan.2020
Failure of a Prestressed Concrete Steel Strand
M - High Carbon SteelP - Wire RopeAp - StructureCd - Corrosion Fatigue
Cm - NItal Etched MacroDf - Longitudinal Section
Macrography of a longitudinal section of the crankshaft showing the rod bearing in the center (the rod is 54mm diameter), as well as two main bearings in both lateral sides. It is possible to see that the surface was heat treated and the hardened layer is about 3mm deep from the surface.
100
VIEW
ML00154 / Jan.2019
High Strength Cast Iron Crankshaft
M - Nodular Cast IronP - CastingAp - EngineCd - Surface treatment
Cm - NItal Etched MacroDf - Longitudinal Section
Macrography of a section longitudinal to the pipe and transverse to the weld. The thickness of the pipe is 12,7 mm (1/2") and it was welded in 6 passes, the root pass, one fill pass and four cap passes.
855
VIEW
ML00153 / Jan.2019
X52 in a Tubular Structure
M - CMn SteelP - Seamless PipeAp - StructureCd - Qualified
Cm - NItal Etched MacroDf - Welded Joint
The longitudinal section of the shaft shows a coarse structure. Only very close to the surface the structure is slightly refined.
99
VIEW
ML00152 / Dec.2018
Low Alloy Steel Pump Shaft
M - High Strength Low AlloyP - ShaftAp - Oil and GasCd - Removed From Service
Cm - NItal Etched MacroDf - Longitudinal Section

More from these cases

ML00158 — Surface Hardened Carbon Steel WheelM - High Carbon SteelP - WheelAp - TransportationCd - Removed From Service
Macrography of a wheel section close to the tread, where the material receives a localized surface hardening by quenching and tempering. The average hardness at the surface is 346HB and in the center is 196HB. The wheel was in operation for a long time and the analyzed part is at the wheel tread.
1
VIEW
ML00158 / Feb.2020
Surface Hardened Carbon Steel Wheel
M - High Carbon SteelP - WheelAp - TransportationCd - Removed From Service
Cm - NItal Etched MacroDf - Transverse Section