You are correct in that steel is harder and stiffer than titanium. Steel is also more re-usable, smelt-able than titanium. However, when it comes to fatigue (w

You are correct in that steel is harder and stiffer than titanium. Steel is also more re-usable, smelt-able than titanium. However, when it comes to fatigue (which I assume, you are referring to fracture strain) titanium has a significant edge. The fracture strain for steel is roughly 15%, but for titanium alloys, it often reaches and exceeds 50%. I don't say this to contradict you, but to point out that as with most things in life, "it depends". Source: https://www.ulbrich.com/blog/titanium-versus-steel-a-battle-of-strength/#:~:text=Titanium%20also%20has%20good%20fatigue,best%20choice%20for%20these%20applications https://www.ulbrich.com/blog/titanium-versus-steel-a-battle-....