Now with his weight and mass he might be able to drive a sword through a week point in the armor, but you can't just slice through a mail vest or a helmet. You seriously need an axe, and even then you're more likely to just cave it in. In fact, many swords might not be able to stand up under the terrific force it would take to actually cut through a mail vest.
If we take Conan's chopping into mailed men seriously we'd have to conclude that he is not only superhuman, he is several times as strong a real person. Especially since we're not talking just cuts or nicks, but flat out cleaving into breastplates and helms right through in a lightning fast motion. The strength required to do that is inhuman.
I'm not trying to say body armor makes you invincible, you can still beat a man to death with a sword even if you can't cut him. But it is steel rings we're talking about. Armorers of the middle ages did know what they were doing. The most realistic outcome (which occurs in a few RE Howard stories I've read) is for the person's bones and flesh to be broken and mangled. Actually chopping in to them, with a regular ease, is pretty out there.
Edited by RJMooreII, 21 April 2012 - 01:26 AM.