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I was gonna say something similar, I saw some pre-stressed concrete for part of a bridge used stainless cables for tensioning. Although it's not cheap as plain steel cable and iron rebar.

Although, stainless is not rust free, it's called stain-less, not stain-free. So it will degrade eventually especially in harsh environments.

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It really depends on which type of stainless steel that is used. Some, like 400 series, will in fact rust.

Others, like Hastalloy and Ferrallium, have very good resistance to corrosion. A company I worked for used these metals for burial containers that were certified for ~300 years.

Again hundreds of years, still a heck of lot better than plain iron. Although there is concrete that is older than that some well over 1000 years.

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