Corrosion behavior of an alumina forming austenitic steel exposed to supercritical carbon dioxide

Effect of pressure on supercritical CO2 compatibility of structural alloys at 750 °C

“…To illustrate the limited sCO 2 data available above 700 °C and 200 bar, the diamond symbols in Fig. attempt to summarize the conditions explored in previous sCO 2 compatibility evaluations . In the presence of CO 2 , there is a concern about internal carburization (despite the very low C activity in the gas, ∼10 −14 atm at 750 °C), as was observed 50 years ago for conventional austenitic stainless steel and alloy 600 in only 1 bar CO 2 .…”

“…Previous and current sCO 2 studies as a function of CO 2 temperature and pressure. Diamonds show prior exposures at CEA , INL , MIT , and Wisconsin , stars show prior ORNL studies and circles show current conditions. The design limits of the alloy 282 autoclave are shown for reference…”

Effect of pressure on the corrosion and carburization behavior of chromia-forming heat-resistant alloys in high-temperature carbon dioxide environments

“…The corrosion and carburization behavior of several candidate materials has been studied in S-CO 2 environments at various temperatures (500-750 • C) and pressures (20)(21)(22)(23)(24)(25), conditions relevant to SFR and advanced ultra-supercritical (A-USC) fossil plant operation [12][13][14][15][16][17][18][19][20][21][22][23][24]. According to those studies, for Fe-based alloys on which Fe-and Cr-rich oxides were formed, carburization was observed at the oxide layer/matrix interface and underneath the oxide layer during S-CO 2 exposure at 550-650 • C [6,15,18].…”

Formation of L12-ordered precipitation in an alumina-forming austenitic stainless steel via Cu addition and its contribution to creep/rupture resistance

“…The superior oxidation resistance of AFA steels in water vapor at elevated temperatures results from the formation of an alumina protective scale, which is much more stable than the conventional chromia scale [1,5]. The creep resistance of AFA steels is improved mainly by precipitation strengthening [6].…”