Zairyo-to-Kankyo
Online ISSN : 1881-9664
Print ISSN : 0917-0480
ISSN-L : 0917-0480
Corrosion Resistance of 5Cr-0.3Cu-0.3Ni Steel in LNG Fired Smokestack Environment
Akira UsamiKouji TanabeYoshikazu YamadaKatsutoshi HashimaRyuichiro Ebara
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JOURNAL FREE ACCESS

2005 Volume 54 Issue 12 Pages 569-575

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Abstract

Corrosion resistance of newly developed 5Cr-0.3Cu-0.3Ni steel in LNG fired smokestack environment was evaluated. On the basis of analytical survey of the corrosion environment, the authors deduced that corrosion could hardly occur during stationary operating conditions, but dominantly proceed during start and stop of boilers, which induces cyclic wet and dry conditions with dew dissolving CO2 and other soluble deposits. Results obtained with the alternating wet and dry CO2 gas corrosion test developed by the authors, showed good agreements with those with field exposure test in terms of corrosion rates, corrosion losses per wet and dry cycle, and morphology. It was confirmed that the 5Cr-0.3Cu-0.3Ni steel itself and its welded joints with austenitic welding material showed sufficient corrosion resistance in LNG fired smokestack environment. It was found that 5Cr efficiently reduces the corrosion rate and that 0.3Cu-0.3Ni improves adhesive property of corrosion products.

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© Japan Society of Corrosion Engineering
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