picked up a 50 year old Sears Shredder and Bagger. 3.5 HP. Little f***er is in great shape. Ran some Seafoam in ethanol free fuel trough it which cleared up carburation issues and runs great for an engine i thought would need at least a carb rebuild when i bought it.
after 4-5 hours of using it, i've decided the blades are worn beyond serviceability and need replaced. looking for replacement blades is quite likely pointless so i'm not going to even bother trying.
this things has a stack of 3 what look like small lawn mower blades.
what steel would you make the blades from? i could go with A2 or D2 tool steel heat treated to somewhere in the RC 50-60 hardness range. or even M2 steel if i wanted to mulch metal fence posts, though the housing around the blades may not be quite up to the task.
would pre hard 4140 be a decent choice? or would just some 1018 crs be suffice for chopping up small yard brush and leaves?