[TheForge] Re: [TheForge] Heat Treating 5160 was Welding 5160

Sat Aug 30 13:37:00 2003

Dave:  Maybe the reason they don't need to temper is because they not
reached  full hardness.  Grant
----- Original Message ----- 
From: "David E. Smucker" <[email protected]>
To: <[email protected]>
Sent: Friday, August 29, 2003 2:24 PM
Subject: [TheForge] Heat Treating 5160 was  Welding 5160


> 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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