Ferrous Alloys

3 cases · 3 images

Crevice Corrosion in a Subsea System — Aspect Before Analysis

Standard: G41400 Capture method: Naked Eye or Stereoscope clear all

Ferrous Alloys — sub-branches

Low Alloy Steel 3

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The longitudinal section of the shaft shows a coarse structure. Only very close to the surface the structure is slightly refined.
99
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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
Macrography of a stud longitudinal sectiion at the fracture position (top of the figure). It is possible to see a large secondary crack at the bottom of the thread fillet adjacent to the fracture surface, without any deformation evidence. This reveals a brittle material behavior, although the hardness measured at the stud end revealed 33HRc, as should be expected by the material specification.
56
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ML00136 / Jun.2018
Hydrogen Cracks of Subsea Studs
M - Low Alloy Medium Carbon QTP - FastenerAp - SubseaCd - Hydrogen Embrittlement
Cm - NItal Etched MacroDf - Secondary Cracks
Macrography of a longitudinal section of the stud, showing the flat fracture of brittle aspect.
46
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ML00127 / May.2018
Hydrogen Cracks of Cadmium Plated Studs
M - Low Alloy Medium Carbon QTP - Allen StudAp - Oil and GasCd - Hydrogen Embrittlement
Cm - NItal Etched MacroDf - Longitudinal Section