I have cut up truck axles - it was a long time ago. My recollection is that it was really hard material. I then annealed several pieces and it cut very easily. If what you are making needs the high strength it may be worth the effort to machine the hardened material ($). You can torch/abrasive chop it up, then anneal it, but If you are just looking for general purpose material to machine into useful stuff then there are easier options (industrial bolting, pump/fan shafts, ….).