Hello from the University of Washington.
I currently researching bicycle frames with a group of mechanical engineering students. It would really help us out if we could pinpoint the exact kind of steel that is used in bicycles. We already have researched and tested carbon fiber and aluminum 6061. We already went ahead and tested Stainless steel 316 (rare in bikes) and mild steel 1018 (not sure if used in bikes).
If any of you can refer me to a website or tell me what SPECIFIC kind of steel(s) is/are used in bikes, it would really speed things up.