Low Alloy Steel

9 cases · 65 images

Crevice Corrosion in a Subsea System — Aspect Before Analysis

Product: Raw Material Application: Oil and Gas clear all

Low Alloy Steel — sub-branches

CMn Steel 5Low Alloy Medium Carbon QT 3Microalloyed Steel 1

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Micrography of a transverse section of the lifting part, showing interdendritic voids close to the surface at the inner diameter of the padeye. The microstructure is tempered martensite.
450
VIEW
ML00098 / Nov.2017
Brittle Fracture of a Casting Lifting Device
M - Low Alloy Medium Carbon QTP - CastingAp - LiftingCd - Brittle Fracture
Cm - Nital Etched Micrography by OMDf - Casting defects
Micrography of the external surface of the tubular equipment, close to the fracture position (it is to the top of the figure), showing multiple cracks, typical of a corrosion fatigue mechanism.
861
VIEW
ML00082 / Dec.2017
Corrosion Fatigue of a Drilling Tool
M - Low Alloy Medium Carbon QTP - Tubular ForgingAp - O&G Well DrillingCd - Corrosion Fatigue
Cm - Nital Etched Micrography by OMDf - Multiple cracks
The macrography of a longitudinal section of the pipe and connector, at the welded joint, shows that the welding was conducted from both side of the groove, starting from the ID and finishing from the OD, ID later machined flush. The cracking was detected by ultrasonic test and the macro shows that it is at the fusion line, growthing into the weld metal. See the schematic drawing in the next figure
535
VIEW
ML00072 / Jan.2018
Liquation Cracks in a High Strength Joint
M - Low Alloy Medium Carbon QTP - Longitudinal Seam Welded PipeAp - O&G Well DrillingCd - Welding Defect
Cm - NItal Etched MacroDf - Longitudinal Section
Longitudinal section of the fitting in the center of the thickness (2"). Refined ferritic structure.
370
VIEW
ML00030 / Jan.2017
Forging for High Pressure Application
M - Microalloyed SteelP - Machined PartAp - Oil and GasCd - Typical manufacturing
Cm - Nital Etched Micrography by OMDf - Bainitic Ferrite
Ferritic perlitic microstructure, banded, in the center of the 5/16" thick C-Mn plate. Refined Structure.
371
VIEW
ML00021 / Dec.2017
5/16" CMn Steel Plate for Pressure Vessel
M - CMn SteelP - PlateAp - Oil and GasCd - Typical manufacturing
Cm - Nital Etched Micrography by OMDf - Grain refined structure
Ferritic perlitic microstructure, banded, in the center of the 1/2" thick C-Mn plate. Refined Structure.
327
VIEW
ML00022 / Dec.2017
1/2" CMn Steel Plate for Pressure Vessel
M - CMn SteelP - PlateAp - Oil and GasCd - Typical manufacturing
Cm - Nital Etched Micrography by OMDf - Grain refined structure
Ferritic perlitic microstructure, banded, in the center of the 5/8" thick C-Mn plate. Refined Structure.
357
VIEW
ML00023 / Dec.2017
5/8" CMn Steel Plate for Pressure Vessel
M - CMn SteelP - PlateAp - Oil and GasCd - Typical manufacturing
Cm - Nital Etched Micrography by OMDf - Grain refined structure
Ferritic perlitic microstructure, banded, in the center of the 3/4" thick C-Mn plate. Refined Structure.
349
VIEW
ML00024 / Dec.2017
3/4" CMn Steel Plate for Pressure Vessel
M - CMn SteelP - PlateAp - Oil and GasCd - Typical manufacturing
Cm - Nital Etched Micrography by OMDf - Grain refined structure

More from these cases

ML00098 — Brittle Fracture of a Casting Lifting DeviceM - Low Alloy Medium Carbon QTP - CastingAp - LiftingCd - Brittle Fracture
Aspect of the broken padeye. The outer diameter is about 10" and the thickness of the casting is about 2".
22
VIEW
ML00098 / Nov.2017
Brittle Fracture of a Casting Lifting Device
M - Low Alloy Medium Carbon QTP - CastingAp - LiftingCd - Brittle Fracture
Cm - Aspect Before AnalysisDf - General View
Aspect of the fracture surface, showing a brittle morphology. Flat fracture with chevron marks from regions close to the internal diameter of the padeye, where there are secondary cracks.
22
VIEW
ML00098 / Nov.2017
Brittle Fracture of a Casting Lifting Device
M - Low Alloy Medium Carbon QTP - CastingAp - LiftingCd - Brittle Fracture
Cm - Aspect Before AnalysisDf - Fracture
Micrography of the lifting padeye showing a dendritic path of a quenched and tempered martensitic microstructure. The segregated regions (white interdendritic regions) are more clearly identified in low magnification. Voids are located in these segregated regions.
21
VIEW
ML00098 / Nov.2017
Brittle Fracture of a Casting Lifting Device
M - Low Alloy Medium Carbon QTP - CastingAp - LiftingCd - Brittle Fracture
Cm - Nital Etched Micrography by OMDf - Martensite
Micrography of the lifting padeye showing a quenched and tempered martensitic microstructure. Voids are located in interdendritic segregated regions.
20
VIEW
ML00098 / Nov.2017
Brittle Fracture of a Casting Lifting Device
M - Low Alloy Medium Carbon QTP - CastingAp - LiftingCd - Brittle Fracture
Cm - Nital Etched Micrography by OMDf - Martensite
Micrography of the lifting padeye showing a quenched and tempered martensitic microstructure. Voids are located in interdendritic segregated regions. At this magnification the segregation is not clear.
16
VIEW
ML00098 / Nov.2017
Brittle Fracture of a Casting Lifting Device
M - Low Alloy Medium Carbon QTP - CastingAp - LiftingCd - Brittle Fracture
Cm - Nital Etched Micrography by OMDf - Martensite

+12 more from this case →

ML00082 — Corrosion Fatigue of a Drilling ToolM - Low Alloy Medium Carbon QTP - Tubular ForgingAp - O&G Well DrillingCd - Corrosion Fatigue
Drilling tool that broke close to the region of the male connector (pin end). The fracture is at the right side of the figure.
102
VIEW
ML00082 / Dec.2017
Corrosion Fatigue of a Drilling Tool
M - Low Alloy Medium Carbon QTP - Tubular ForgingAp - O&G Well DrillingCd - Corrosion Fatigue
Cm - Aspect Before AnalysisDf - Fracture
The fracture was removed from the failed part and analyzed separately. The aspect of the fracture surface is presented. It is flat, with regions of fatigue propagation and with regions of erosion by washout (to the right side of the figure).
80
VIEW
ML00082 / Dec.2017
Corrosion Fatigue of a Drilling Tool
M - Low Alloy Medium Carbon QTP - Tubular ForgingAp - O&G Well DrillingCd - Corrosion Fatigue
Cm - Aspect Before AnalysisDf - Fracture
Detail of the fracture surface presenting a fatigue propagation from the outside of the tool.
69
VIEW
ML00082 / Dec.2017
Corrosion Fatigue of a Drilling Tool
M - Low Alloy Medium Carbon QTP - Tubular ForgingAp - O&G Well DrillingCd - Corrosion Fatigue
Cm - Aspect Before AnalysisDf - Fatigue Fracture
Detail of the fracture surface presenting erosion by a washout, because the equipment was pressurized when the cracking became through wall.
63
VIEW
ML00082 / Dec.2017
Corrosion Fatigue of a Drilling Tool
M - Low Alloy Medium Carbon QTP - Tubular ForgingAp - O&G Well DrillingCd - Corrosion Fatigue
Cm - Aspect Before AnalysisDf - Washout
Micrographic aspect of the martensitic structure at the longitudinal section.
60
VIEW
ML00082 / Dec.2017
Corrosion Fatigue of a Drilling Tool
M - Low Alloy Medium Carbon QTP - Tubular ForgingAp - O&G Well DrillingCd - Corrosion Fatigue
Cm - Nital Etched Micrography by OMDf - Martensite

+6 more from this case →

ML00072 — Liquation Cracks in a High Strength JointM - Low Alloy Medium Carbon QTP - Longitudinal Seam Welded PipeAp - O&G Well DrillingCd - Welding Defect
Schematic drawing presenting the longitudinal section of the pipe and connector at the welded joint
105
VIEW
ML00072 / Jan.2018
Liquation Cracks in a High Strength Joint
M - Low Alloy Medium Carbon QTP - Longitudinal Seam Welded PipeAp - O&G Well DrillingCd - Welding Defect
Cm - Identification drawingDf - Longitudinal Section
Hot cracking at the fusion line of the connector side, in a welded joint between a forging and a pipe, in a macrographic sample. The region of the heat affected zone of the connector presents a dendritic aspect suggesting that the forging reduction rate of the connector was not too high and did not broke the cast structure.
110
VIEW
ML00072 / Jan.2018
Liquation Cracks in a High Strength Joint
M - Low Alloy Medium Carbon QTP - Longitudinal Seam Welded PipeAp - O&G Well DrillingCd - Welding Defect
Cm - NItal Etched MacroDf - Welded Joint
The connector was welded to the pipe from both (internal and external) sides, a PWHT was applied and the part was machined. The UT indication was detected during final inspection.
78
VIEW
ML00072 / Jan.2018
Liquation Cracks in a High Strength Joint
M - Low Alloy Medium Carbon QTP - Longitudinal Seam Welded PipeAp - O&G Well DrillingCd - Welding Defect
Cm - Aspect Before AnalysisDf - General View
Micrography of the welded joint fusion line presenting the liquation cracking. The weld metal is in the right side (bottom) and the forged connector heat affected zone is in the left side (top).
83
VIEW
ML00072 / Jan.2018
Liquation Cracks in a High Strength Joint
M - Low Alloy Medium Carbon QTP - Longitudinal Seam Welded PipeAp - O&G Well DrillingCd - Welding Defect
Cm - Nital Etched Micrography by OMDf - Cracking
The liquation crack is a hot crack in the base metal (at the HAZ) that induces a solidification crack in the weld metal.
66
VIEW
ML00072 / Jan.2018
Liquation Cracks in a High Strength Joint
M - Low Alloy Medium Carbon QTP - Longitudinal Seam Welded PipeAp - O&G Well DrillingCd - Welding Defect
Cm - Nital Etched Micrography by OMDf - Weld Metal

+11 more from this case →

ML00030 — Forging for High Pressure ApplicationM - Microalloyed SteelP - Machined PartAp - Oil and GasCd - Typical manufacturing
Longitudinal section of the fitting in the center of the thickness (2"). Refined ferritic structure.
67
VIEW
ML00030 / Jan.2017
Forging for High Pressure Application
M - Microalloyed SteelP - Machined PartAp - Oil and GasCd - Typical manufacturing
Cm - Nital Etched Micrography by OMDf - Grain refined structure
Longitudinal section of the fitting in the center of the thickness (2"). Refined ferritic structure.
63
VIEW
ML00030 / Jan.2017
Forging for High Pressure Application
M - Microalloyed SteelP - Machined PartAp - Oil and GasCd - Typical manufacturing
Cm - Nital Etched Micrography by OMDf - Grain refined structure
ML00021 — 5/16" CMn Steel Plate for Pressure VesselM - CMn SteelP - PlateAp - Oil and GasCd - Typical manufacturing
Ferritic perlitic microstructure, banded, in the center of the 5/16" thick C-Mn plate. Refined Structure.
64
VIEW
ML00021 / Dec.2017
5/16" CMn Steel Plate for Pressure Vessel
M - CMn SteelP - PlateAp - Oil and GasCd - Typical manufacturing
Cm - Nital Etched Micrography by OMDf - Banded Pearlite
Ferritic perlitic microstructure, banded, in the center of the 5/16" thick C-Mn plate. Refined Structure.
54
VIEW
ML00021 / Dec.2017
5/16" CMn Steel Plate for Pressure Vessel
M - CMn SteelP - PlateAp - Oil and GasCd - Typical manufacturing
Cm - Nital Etched Micrography by OMDf - Longitudinal Section
ML00022 — 1/2" CMn Steel Plate for Pressure VesselM - CMn SteelP - PlateAp - Oil and GasCd - Typical manufacturing
Ferritic perlitic microstructure, banded, in the center of the 1/2" thick C-Mn plate. Refined Structure.
32
VIEW
ML00022 / Dec.2017
1/2" CMn Steel Plate for Pressure Vessel
M - CMn SteelP - PlateAp - Oil and GasCd - Typical manufacturing
Cm - Nital Etched Micrography by OMDf - Banded Pearlite
Ferritic perlitic microstructure, banded, in the center of the 1/2" thick C-Mn plate. Refined Structure.
29
VIEW
ML00022 / Dec.2017
1/2" CMn Steel Plate for Pressure Vessel
M - CMn SteelP - PlateAp - Oil and GasCd - Typical manufacturing
Cm - Nital Etched Micrography by OMDf - Longitudinal Section
ML00023 — 5/8" CMn Steel Plate for Pressure VesselM - CMn SteelP - PlateAp - Oil and GasCd - Typical manufacturing
Ferritic perlitic microstructure, banded, in the center of the 5/8" thick C-Mn plate. Refined Structure.
21
VIEW
ML00023 / Dec.2017
5/8" CMn Steel Plate for Pressure Vessel
M - CMn SteelP - PlateAp - Oil and GasCd - Typical manufacturing
Cm - Nital Etched Micrography by OMDf - Banded Pearlite
Ferritic perlitic microstructure, banded, in the center of the 5/8" thick C-Mn plate. Refined Structure.
14
VIEW
ML00023 / Dec.2017
5/8" CMn Steel Plate for Pressure Vessel
M - CMn SteelP - PlateAp - Oil and GasCd - Typical manufacturing
Cm - Nital Etched Micrography by OMDf - Longitudinal Section
ML00024 — 3/4" CMn Steel Plate for Pressure VesselM - CMn SteelP - PlateAp - Oil and GasCd - Typical manufacturing
Ferritic perlitic microstructure, banded, in the center of the 3/4" thick C-Mn plate. Refined Structure.
31
VIEW
ML00024 / Dec.2017
3/4" CMn Steel Plate for Pressure Vessel
M - CMn SteelP - PlateAp - Oil and GasCd - Typical manufacturing
Cm - Nital Etched Micrography by OMDf - Banded Pearlite
Ferritic perlitic microstructure, banded, in the center of the 3/4" thick C-Mn plate. Refined Structure.
29
VIEW
ML00024 / Dec.2017
3/4" CMn Steel Plate for Pressure Vessel
M - CMn SteelP - PlateAp - Oil and GasCd - Typical manufacturing
Cm - Nital Etched Micrography by OMDf - Longitudinal Section