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High‐temperature internal sulphur corrosion of H 18 N 9 steel
Author(s) -
Gasior Eugeniusz,
Wilczyńnski Andrzej
Publication year - 1987
Publication title -
materials and corrosion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.487
H-Index - 55
eISSN - 1521-4176
pISSN - 0947-5117
DOI - 10.1002/maco.19870380905
Subject(s) - internal oxidation , corrosion , high temperature corrosion , metallurgy , hydrogen , oxygen , materials science , atmospheric temperature range , sulfur , chromium , argon , metal , atmosphere (unit) , chemistry , oxide , physics , organic chemistry , thermodynamics , meteorology
The paper presents some results of investigations into the high‐temperature corrosion of the CrNiSi steel H 18 N 9 S in atmospheres containing sulphur and oxygen. Specimens of the steel H 18 N 9 S were exposed at various temperatures to an atmosphere containing 47% Argon, 50% hydrogen, 3% hydrogen sulphide and about 0.2% oxygen. Corrosion was connected with intense internal sulphidation. This process causes a decrease of the chromium content in the metallic matrix and, consequently, γ→α transformation. In the temperature range between 830–930°C the thickness of the external scale is by 6 to 10 times smaller than that of the internal sulphidation zone.
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