Your concentration range of chlorides is high enough to be of concern with 316L stainless steel. Generally, the rule of thumb for continuous chloride exposure to 316L stainless steel is 1000 ppm. The references I checked say that aluminum nickel bronze is acceptable for brackish water and sodium chloride at 70 °F but not for wet hydrogen sulfide gas. However, your hydrogen sulfide levels may be low enough that corrosion won’t be an issue. What alloys might work for your application will depend not only on the chloride and hydrogen sulfide levels, but also on temperature and what other species are present. If you can’t find the data to support the selection of an appropriate alloy, lab testing should be considered.
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