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02203 Environmentally Assisted Cracking of External Equipment Connections in Ship Service

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Product Number: 51300-02203-SG
ISBN: 02203 2002 CP
Author: Phillip Rogers
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The paper details the metallurgical examinations performed to determine the cause of failure of UNS K31820/UNS N06625 studs used to secure extemal equipment to the hull of a ship. The metallurgical examinations and the discussion of expected environment conditions lead to a conclusion that environmentally assisted cracking (EAC) caused some of the stud failures. EAC failures occurred through the stud weld region, i.e., through a stud's weld, weld fusion zone and heat-affected zone (HAZ). The remaining failures were concluded to have occurred when the UNS K31820 portion of the studs underwent significant corrosion due to failure of the protective coating system.
The paper details the metallurgical examinations performed to determine the cause of failure of UNS K31820/UNS N06625 studs used to secure extemal equipment to the hull of a ship. The metallurgical examinations and the discussion of expected environment conditions lead to a conclusion that environmentally assisted cracking (EAC) caused some of the stud failures. EAC failures occurred through the stud weld region, i.e., through a stud's weld, weld fusion zone and heat-affected zone (HAZ). The remaining failures were concluded to have occurred when the UNS K31820 portion of the studs underwent significant corrosion due to failure of the protective coating system.
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