[TheForge] Heat Treating 5160 was Welding 5160

Fri Aug 29 17:29:01 2003

Yep, Chuck -- I don't think you would suggest cryogenic quenching for a
blacksmith's hot punch -- but I wouldn't think of not requiring it on the
purchase of a $ 10,000 five percent chrome cold mill work roll made from ESR
steel.

It didn't get talk about much in this series but your earlier point of the
need to normalize to refine grain structure is one of the more important
things that is easy to do and many times skipped by the blacksmith heat
treating his tools.  In general there are only two things we can do to
reduce grain size -- forging, and normalizing.  We do a lot of  increasing
grain size by multi heats at high temperature and really should normalize
before heat treating.  Jim Batson suggest doing this three times for knife
blades -- I would settle for once for most tools, but many times it is just
skipped.  Are we really in that big of a hurry.

The other one I don't understand is the great desire to NOT TEMPER -- it can
be done quickly and safely for almost any tool.  Why leave it out.  At the
very least put it in the oven at 350 *F for an hour.  It gives only a small
reduction in hardness and a big increase in toughness.  (And yes it may well
get tempered in service from use on hot metal, but the time to temper is
right now, following heat treat.  As you have said many blades have been
lost by the failure to temper now, saying I do it tomorrow -- but it is
cracked in the morning.)

Dave Smucker

----- Original Message ----- 
From: "Chuck Robinson" <[email protected]>
To: <[email protected]>
Sent: Friday, August 29, 2003 3:41 PM
Subject: [TheForge] Re: [TheForge] Re: [TheForge] Heat Treating 5160 was
Welding 5160

> Right Dave,
> And we haven't even begun to discuss:interrupted quenching, mar-quenching,
> banite quenching, multiple quenching, differential quenching, clay
> quenching, and cryogenic quenching.
> Chuck
>
>
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