This question might better be answered by someone in the oil and gas industry where hydrogen sulfide is dealt with frequently. Hydrogen sulfide can be corrosive to stainless steels and cause a form of localized corrosion called sulfide stress corrosion cracking (SCC). The corrosivity of your stream will depend on the specific conditions including what other constituents are present. There are several publications and standards like NACE MR0175/ISO 15156, "Petroleum and Natural Gas Industries—Materials for Use in H2S-Containing Environments in Oil and Gas Production," that give recommendations and guidelines on what materials of construction are suitable for hydrogen sulfide and how to avoid SSC. I suggest you consult one or more of these for more information.