Zairyo-to-Kankyo
Online ISSN : 1881-9664
Print ISSN : 0917-0480
Research Paper
Effects of Temperature and Anion-species on the Susceptibility to Chloride Stress Corrosion Cracking of Stainless Steels in Hot Water
Tomoaki SaidaKatsuaki SatoKensuke KurodaMasazumi Okido
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2013 Volume 62 Issue 6 Pages 224-230

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Abstract

The combined addition of Si and Cu is effective in order to improve the stress corrosion cracking(SCC)resistance in hot water environment, and SUS315J1(18Cr-10Ni-1.5Si-1Mo-3Cu)has been developed and put in practical use. But, the preset temperature of equipments for supplying hot water in recent years has tended to become high(near 100℃). Moreover, the influence of anion-species included in hot water on SCC has not been confirmed yet.
The SCC resistance of various stainless steels was examined by the immersion test using spot-welded specimens in 200 mg/L Cl solution at 60, 95 and 125℃. The materials used were SUS304, SUS315J1, SUS316 and SUS444 cold-rolled steel. SUS315J1 showed the good SCC resistance compared with SUS304 and SUS316 at a temperature under 95℃.
The influence of various anion-species(NO3, SO42-, CO32- and HCO3)on SCC was considered by the immersion test or electrochemical measurement in 200 mgL-1 Cl solution. These anion-species that generally act as a corrosion inhibitor performed as accelerator on SCC initiation in addition of a small amount of anions. However, SCC tended not to occur in SUS315J1 in these solutions.

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© 2013 Japan Society of Corrosion Engineering
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