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@Rik_Van_Looy
At least Aluminium's softer and easier to saw out with a hacksaw blade. - and I'm dying to try fizzing one out with sodium hydroxide....
I've got a 1930's 531 frame with a 531 seatpost completely jammed.
I put the seatpost in a lathe chuck and tried rotating the frame, I've tried injecting the slit in the seattube with neat phosphoric acid, I've mixed phosphoric acid and meths and filled the whole seattube and left to soak for months until it had evaporated, I enjoyed the hammer of gods technique (tech term "jarring") mentioned by stedlocks, I've tried thermal expansion (gas torch on the frame and dripping lube oil on the seat post) eventually I got impatient and held it in a vice to turn the frame - this sheared it off at the seat clamp. Now I'm using a drill and burr to try and grind it out - unfortunately it's inserted by a good 12" - I've made a collet for the burr so it'll get down to 6" and hope that the hammer of the gods will knock the remainder out.
The frame's really not worth it, but I refuse to be beaten