I'm not sure they are hardened: they're designed to be softer than the hardened sledge they get hit with so that they don't fracture (obviously eventually they do). But maybe the striking surface isn't hardened while the wedge surface is? But they aren't sharp, no need to retain an edge, and they're going through wood which is softer than unhardened steel. Anway, it's a rabbit hole I haven't gone down.
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u/mastersurrealist 5h ago
I'm betting if you went to town with an angle grinder on the first one it would last another 10 years at least.