[TheForge] Tempering

[theforge@mailman.qth.net]

Gents,

In attempting to fabricate a replacement part for my buggy wheel tire setting machine I find that I need to temper the steel. I don't want it to become too brittle so I've been trying various quenching media. i.e. water, various oils, etc. I've seen some of you mention vermiculite as a medium. Anybody care to explain the benefits of the various methods and media and the degree of hardness achieved by each?

Regards,
Donn
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