The influence of surface pre-treatment on the metal dusting behaviour of cast and wrought 25Cr35NiFe
conference paper
Corrosion investigations and testing standards normally use standard surface pre-treatments, i.e. ground samples. This is in order to be able to determine the impact of various elements. The end users of materials therefore generally have access to good data regarding the influence of the alloy composition. The problem is that alloys are industrially almost never used in a ground condition, as the surface condition strongly depends on the production route used. This study addresses this problem. The metal dusting resistance of wrought and spun cast 25Cr35NiFe with different surface conditions has been investigated. The samples came from commercially available tubes with their standard surface condition; the wrought alloy in a pickled state and the spun cast deep hole drilled. Samples with the original and ground surfaces were exposed for 600 h at 600°C in a CO/CO 2/H 2/H 2O mixture, P tot=5.5 bar (a c: Boudouard/CO red/WGS: 558/232/379), corresponding to conditions in some furnaces used for the direct reduction of iron ore. According to the results the metal dusting behaviour of 25Cr35NiFe is in general good, but is strongly influenced by its surface pre-treatment. The pickled surface was sensitive toward metal dusting attack while the drilled and the ground samples had better resistance. This shows that the surface pre-treatment plays a crucial role.
TNO Identifier
460482
ISBN
9781618394125
Source title
European Corrosion Congress 2011, EUROCORR 2011, 4-8 September 2011, Stockholm, Sweden
Pages
995-1004
Files
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