ステンレス配管の保温材下応力腐食割れ事例

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  • Stress Corrosion Cracking (SCC) Caused on Stainless Steel Pipelines Covered by Insulated Material on Board Ship

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<p>  It has been well known that SUS304 stainless steel may be sometime caused stress corrosion cracking (SCC) due to chlorine ions with two kinds of process. One is sensitization SCC caused by ingress of chlorine ions into sensitized grain boundaries in which chromium carbides or chromium deficient area may be formed by unsuitable welding condition such as improper welding heat input management or incorrect welding speed, etc., cracks will be initiated and propagated along this sensitized grain boundaries. The other is SCC caused on SUS304 stainless pipes covered by insulation material. This paper focuses on the later cases of SCC which was caused on cargo pipelines made of SUS304 stainless steel covered by insulation material in a chemical carrier.</p>

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