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Susceptibility of 5% Nickel Steel to Stress Corrosion Cracking in Liquid Ammonia

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Abstract:

This study aimed to demonstrate the susceptibility of 5% Ni steel to stress corrosion cracking, SCC, in anhydrous liquid ammonia. SCC tests using four-point bend specimens cut from welds in SPV315, HT780 and 5% Ni steel were carried out in anhydrous liquid ammonia with 5wt% NH4CO2NH2 and 0.1MPa O2 at +2.0V, which is an accelerated SCC test condition. No SCC was observed in SPV315, whose strength is within the allowable strength of IGC code 17.12, but SCC was observed in the HAZ of HT780, whose strength is higher than the upper limit of IGC code 17.12. Furthermore, SCC was recognized in the HAZ and base metal of 5% Ni steel, whose nickel content is higher than the upper limit of IGC code 17.12, and this suggests that 5% Ni steel is susceptible to SCC in anhydrous liquid ammonia.

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Info:

Periodical:

Key Engineering Materials (Volume 1053)

Pages:

59-64

DOI:

https://doi.org/10.4028/p-c7Nb41

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Online since:

May 2026

Authors:

Yoichi Kayamori*, Takahiro Kamo, Haruki Igari, Fuminori Yanagimoto, Shin Nakayama

Keywords:

5% Nickel Steel, Accelerated Test, Electrochemistry, Liquefied Gas Cargo Tank, Liquid Ammonia, Stress Corrosion Cracking

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© 2026 Trans Tech Publications Ltd. All Rights Reserved

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