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  • Covar/Invar is "unpredictable" but not necessarily nasty. The problem with var material is there's no real standard so the mix can change quite a bit... even in the same lot.

    K500 Monel, Waspalloy..... hell, even G10 plastic which can eat carbide for lunch.

    How about good ol' cast iron..... That gets real fun sometimes.

    Materials not through-hardened is a challenge too since obviously, the comp changes inside....

    Tough to say what's "nasty" because what makes them "nasty" can be different worlds in the cut....
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