I would also consider performing a field hardness test such as a portable Brinell hardness. If the hardness results, converted to an approximation of the tensile strength, agree with the UTS of the original spec, then the 3 year reinspection is good.
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Robert Franco
President
Franco Corrosion Consulting, LLC
Bellaire TX
(713) 304-0398
RobertFranco
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Original Message:
Sent: 05-08-2021 08:39
From: Waleed Khalifa
Subject: Overheat damage of carbon steel tubes
The images shown here are replica micrographs for carbon steel pipe that was subjected to an overheat incident:
Material: ASTM A106 Grade B
Design temperature for the tubes is 335 °C.
Temperature excursion exposed tubes to a temperature of 600 °C for 16 hours.
Location: Base material of tube
Description: ferrite and pearlite microstructure showing pearlite decomposition and spheroidization of carbides
Comment: Overheating exposure caused pearlite decomposition (partial metallurgical damage)
Degree of damage: Moderate damage
What was recommended is to repeat replication after 3 years without any immediate action . How do feel about this recommendation?
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Waleed Khalifa
Principal and CEO
Arabic Consultancy Center for Engineering Materials, Inspection and Welding
Maadi, Cairo
Egypt
01098163293
accmiw@ymail.com
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