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Next-generation gravitational wave detectors (GWDs) such as the CosmicExplorer and Einstein Telescope demand extensive ultra-high vacuum systems,making material cost and performance critical considerations. This studyinvestigates the potential of ferritic stainless steel as a cost-effectivealternative to the commonly used austenitic stainless steel for UHV components,focusing on the analysis of outgassing rates pre and post-bakeout at 80{\deg}Cand 150{\deg}C for 48 hours. The tested ferritic stainless steels exhibitsignificantly lower hydrogen content than standard AISI 304L steel. Afterbakeout, the hydrogen outgassing rates - measured down to 10$^{-15}$ mbar ls$^{-1}$ cm$^{-2}$ - are three orders of magnitude lower than those ofsimilarly conditioned austenitic stainless steels. These results highlightferritic stainless steel as a promising, economical, and high-performancecandidate for future GWDs vacuum systems.

Study of the UHV compatibility of selected ferritic stainless steels for application in vacuum systems of future gravitational wave detectors