It's been a few years for me but a Marine Construction company I used to work for did a job where we had installed a fuel line under a pier using stainless hangers. The steel was speced out properly but there was something with 'WHERE" we got it that was the issue. Supposed to be the saltwater grade stuff and started corroding before we were done hanging it! Produced in a country where the spec stamp was penciled in I guess. Those company purchasing agents can make or break the best builders!