UNS

3 cases · 5 images

Crevice Corrosion in a Subsea System — Aspect Before Analysis

Condition: Damage Capture method: NaOH Electrolytic Etched Macro clear all

UNS — sub-branches

A03560 1A96061 1C12000 1C28000 1C36000 1C60800 1C68700 1F32800 2G10050 1G10080 1G10200 2G10450 1G10550 1G10700 1G10800 1G12110 1G15220 mod 1G15240 1G41300 3G41400 2G43400 1G48200 1G61500 1J23055 1J91540 1K03101 2N02200 1N04400 1N07718 3N08705 1R50400 2R56400 1S15500 1S17400 3S17700 1S21800 2S30300 1S30400 4S30409 1S31600 4S31603 3S32304 1S32750 3S32760 2S42000 3S43100 mod 1

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Macrographic aspect of the sleeve longitudinal section where the coating was applied in the external side (top of the figure). It is possible to see that the sleeve was manufactured by centrifugal casting, with elongated grains from the external side, and equiaxial grains close to the internal side (bottom of the figure). There is a weaved interface between the sleeve and the first layer of thermal spray coating, 1 mm thick; and a second layer of thermal spray coating, 0.2mm thick (almost imperceptible at this low magnification).
49
VIEW
ML00147 / Aug.2018
WC Layer Detached from a Cast Lean Duplex
M - Lean Duplex Stainless SteelP - Centrifugal CastingAp - ShipCd - Lack of Sealing
Cm - NaOH Electrolytic Etched MacroDf - Coating Layer
Aspect of the valve body after cutting a slice containg the crack and the welded joint of the body to the insert (fillet weld). The cracking was arrested at the position of this welded joint.
56
VIEW
ML00134 / Aug.2020
Brittle Fracture of a Superduplex Valve Body
M - Super Duplex Stainless SteelP - Fabrication WeldAp - SubseaCd - Brittle Fracture
Cm - NaOH Electrolytic Etched MacroDf - Welded Joint
Macrography of a longitudinal section of the flange to pipe weld, cracked in the flange. Pipe thickness, measured, is 5 mm. Flange thickness at the welded region is 7.5 mm. The macro was etched using NaOH solution, electrolytic.
181
VIEW
ML00002 / Jan.2018
Preferential Dissolution and Cracks in SDSS
M - Super Duplex Stainless SteelP - Fabrication WeldAp - PipingCd - Preferential Dissolution
Cm - NaOH Electrolytic Etched MacroDf - Longitudinal Section

More from these cases

ML00147 — WC Layer Detached from a Cast Lean DuplexM - Lean Duplex Stainless SteelP - Centrifugal CastingAp - ShipCd - Lack of Sealing
Macrography of a longitudinal section showing the region where the surface layer was detached (top of the figure), creating a lack of sealing condition.
23
VIEW
ML00147 / Aug.2018
WC Layer Detached from a Cast Lean Duplex
M - Lean Duplex Stainless SteelP - Centrifugal CastingAp - ShipCd - Lack of Sealing
Cm - NaOH Electrolytic Etched MacroDf - Thermal Spray Layer
ML00134 — Brittle Fracture of a Superduplex Valve BodyM - Super Duplex Stainless SteelP - Fabrication WeldAp - SubseaCd - Brittle Fracture
Macrographic detail of the valve at the welded joint of the SDSS body (left side of the figure) to the Alloy 625 insert (right side of the figure), by a fillet weld. The cracking was arrested at the position of this welded joint.
49
VIEW
ML00134 / Aug.2020
Brittle Fracture of a Superduplex Valve Body
M - Super Duplex Stainless SteelP - Fabrication WeldAp - SubseaCd - Brittle Fracture
Cm - NaOH Electrolytic Etched MacroDf - Welded Joint