Abstract
The stress-corrosion cracking (SCC) behaviour of two lean-duplex stainless steels (DSS 2304 and LDSS 2404) was studied by slow strain-rate tests (SSRT) in 20% NaCl solution at 80 °C (pH about 6) and in NACE TM-0177 solution at 25 °C (pH 2.7), both in the absence and in the presence of thiosulphate ions (S2O32−). The SCC susceptibility of the two alloys was compared to that of LDSS 2101 investigated in a previous study. LDSS 2404 was always immune to SCC, while DSS 2304 (and LDSS 2101) suffered this corrosion form at specific concentrations. The high SCC resistance of DSS 2404 in both environments was connected to its high Mo content, while the significant SCC susceptibility of LDSS 2101 in NACE TM-0177 solution was likely due to the high Mn content of the alloy.
Highlights
Duplex stainless steels (DSS) are very interesting materials due to the favourable combination of their mechanical properties, weldability and corrosion resistance in various environments
Many papers deal with the stress-corrosion cracking (SCC) resistance of DSS 2205 [5,6,7,8,9] and superduplex stainless steels [10,11,12,13] in hydrogen sulphide (H2 S) media
The adopted S2 O3 2− concentrations were selected on the basis of the results found for lean-duplex stainless steels (LDSS) 2101 [18], so 10− 2 and 10− 1 M were used in 20% NaCl and 10− 3 and 10− 2 M were selected for NACE TM-0177 solution at pH 2.7
Summary
Duplex stainless steels (DSS) are very interesting materials due to the favourable combination of their mechanical properties, weldability and corrosion resistance in various environments. These characteristics support their use in various fields, from the paper to the petrochemical industries and from the construction sector to nuclear energy production [1]. Many papers deal with the SCC resistance of DSS 2205 [5,6,7,8,9] and superduplex stainless steels [10,11,12,13] in hydrogen sulphide (H2 S) media. Ruel et al [14]
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