Tl;dr: Does knife steel weaken over time? Paper falls apart since the cellulose makeup breaks down into its glucose subunits. We have Father Time and entropy to thank for that. My question is, does something similar happen to high end steels? Let’s say a Paramilitary 2 in M390. If the knife is used rarely and oiled regularly, will it still have the same degree of toughness, edge retention, corrosion resistance, a thousand years from now? Ten thousand years from now?