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Old 03-03-2017, 06:34 AM
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Tom S. Tom S. is offline
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As stated, MIM parts already have a case hardening. Unless you've done something to remove that hardening, no hardening is required. From my limited amount of work on them, I've found them to be very hard. I would guess around 60 on the Rockwell C scale, which is about what tool steel typically hardens to.
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