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02423 CHLORIDE STRESS CORROSION CRACKING RESISTANCE OF 6% Mo STAINLESS STEEL ALLOY

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Product Number: 51300-02423-SG
ISBN: 02423 2002 CP
Author: Ronald. J. Gerlock and James D. Fritz
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The Fe-21Cr-24Ni-6Mo UNS N08367 alloy was designed to be a seawater resistant alloy and has been successfully used in a multitude of marine and offshore applications including process piping systems, heat exchanger equipment, drilling platforms, and desalination systems. Although the N08367 alloy has improved resistance to chloride stress corrosion cracking (CSCC) it is not completely immune to this mode of failure. This investigation exposed U-bend specimens to various chloride bearing solutions to better define cracking threshold of the N08367 alloy. Samples were exposed in an autoclave using static NaCl solutions and no effort was made to either aerate or deaerate test solutions. The results of this testing indicate that it is unlikely to stress corrosion crack N08367 in presence of chlorides at temperatures in the range of atmospheric boiling (= 100 °C). At temperatures greater than 120°C cracking can be initiated depending on the chloride content of the environment. The threshold temperature for the onset CSCC in straight NaCl solutions was fotmd to increase as the chloride concentration decreased. In the range of 0.02 to 15.8 wt.% chlorides the threshold temperature in °C for the onset of cracking can be defined as Tscc (°C) = 190.05 -47.421og [%Cl]. Testing in 15% artificial sea salt brine solutions produced cracking at temperatures of 150 °C and higher. Deaerated brine solutions resulted in no cracking at temperatures up to 200 °C. Keywords: sea salt, N08367, Stress Corrosion Cracking, U-bend, Temperature effect, Chloride concentration.
The Fe-21Cr-24Ni-6Mo UNS N08367 alloy was designed to be a seawater resistant alloy and has been successfully used in a multitude of marine and offshore applications including process piping systems, heat exchanger equipment, drilling platforms, and desalination systems. Although the N08367 alloy has improved resistance to chloride stress corrosion cracking (CSCC) it is not completely immune to this mode of failure. This investigation exposed U-bend specimens to various chloride bearing solutions to better define cracking threshold of the N08367 alloy. Samples were exposed in an autoclave using static NaCl solutions and no effort was made to either aerate or deaerate test solutions. The results of this testing indicate that it is unlikely to stress corrosion crack N08367 in presence of chlorides at temperatures in the range of atmospheric boiling (= 100 °C). At temperatures greater than 120°C cracking can be initiated depending on the chloride content of the environment. The threshold temperature for the onset CSCC in straight NaCl solutions was fotmd to increase as the chloride concentration decreased. In the range of 0.02 to 15.8 wt.% chlorides the threshold temperature in °C for the onset of cracking can be defined as Tscc (°C) = 190.05 -47.421og [%Cl]. Testing in 15% artificial sea salt brine solutions produced cracking at temperatures of 150 °C and higher. Deaerated brine solutions resulted in no cracking at temperatures up to 200 °C. Keywords: sea salt, N08367, Stress Corrosion Cracking, U-bend, Temperature effect, Chloride concentration.
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