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I've got a King Kutter scarifier shank that I used to make my homemade sub soil tool.
It is not cast steel. It does have a thin coat of heat treated surface hardening I learned when I drilled an extra hole in the shank. Easy enough to drill, because the surface treatment is there to resist ground ware.

IF you were sliding sideways with the shanks engaged into the frozen gravel, I could see where they might break with side pressure.
But all in all, they should be steel and not cast. I think anyway.

Remember, my opinion and $1.oo will get you a coffee......... somewhere.

Good luck
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