Several recent C&V threads got me thinking about this. I've seen many bent and broken steel frames and forks, but haven't had first-hand or even second-hand knowledge of people injured because of frame and fork failure. To be clear, plenty of folks get hurt when frames/forks get bent, but I really wonder how common it is for them to fail in such a way as to hurt the rider, absent any collision or other component failure (derailleur in the spokes, brake caliper falling off, e.g.).
I suspect that steel frame failures are almost never catastrophic. The ones I've seen have come apart in one spot (separation behind the head tube or above the BB most often) but haven't caused the frame to collapse. Still, I'd like to hear from anyone who has been hurt or knows somebody who has when a steel frame or fork failed all on its own.
P.S. If this subject has already generated a thread I apologize for not finding it, and would be grateful for a link.