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Sounds like you want to do some carburizing, I have done lots of heat treating on small parts but mostly tool steels.
I would use oil not water it cools at a slightly slower rate, I think less likely to get stress cracks, make sure you have enough proper oil in a steel container to completely submerge the part, or it will likely catch the oil on fire. Practice on some similar size chunks of steel.
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87 930,
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