For those that keep track of such things, the blades made from ball bearings are most likely 52100, a very good steel;
Carbon 0.98 - 1.1
Chromium 1.3 - 1.6
Iron Balance
Manganese 0.25 - 0.45
Phosphorus 0.025 max
Silicon 0.15 - 0.35
Sulphur 0.025 max
Reference from metal suppliers online.
Just thinking out loud, I'd love to see these on the swap forum!
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