046 said:never said they were. wedges are designed to be hit, so unlikely they would be hardened.
mauls can be hardened or not. Sledges are generally hardened, so swinging hard against a maul buried into a log with a sledge could be a bad thing.
I never have seen a sledge or maul that was hardened - that is the ones meant to be used on farms and in the woods. If they were hardened, they wouldn't be shaped to "hammer" shape.
Harry K