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Commercial alloys 282, 230, HR160, HR120 and 188 were exposed to supercritical CO2 and to air at temperatures of 700–1000 °C. Alloy specimens took the form of thick-walled tubes, which were pressurised internally with flowing CO2 to simulate the likely stress conditions in service. All alloys formed protective scales containing continuous chromia layers plus internal oxidation zones. No internal carburisation...
Commercially available high pressure tubing materials SS316 and Hastelloy-C276, containing a similar chromium content about 17 wt%, were internally pressurised by flowing supercritical CO2 at 20 MPa and heated externally, to 650 °C in the case of SS316, and 650–750 °C in the case of Hastelloy-C276. The stainless steel was found to be corroded by both external oxidation and internal carburisation....
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