Nautilus submarine hull material (HY-80)

HY-80 origin story — developed 1940s-50s by U.S. Steel, used in Nautilus, served until "recently being twenty years" on other subs.

If you look at some of these other things — they once wanted to use an alloy which is very similar, actually it's the predator [predecessor] alloy, to what is now HSLA-80. There's HY-80 that was developed in the 1940s and 50s by U.S. Steel, used in the Nautilus submarine, and used until recently — recently being twenty years — on other subs. They built a couple of HY-100, which is actually the same composition, just a different heat treatment, to give you HY-100. The Navy in the 1960s developed HY-130, and we've never really used it for a full-size ship. We can talk about why.