[TheForge] Heat Treating 5160 was Welding 5160

Tue Aug 26 19:58:01 2003

When quenching for hardness, the critical thing is the length of time it
takes to cool the piece, not the quench medium. A very thin piece of W1
could be air quenched with good results.
Darrell

http://www.machinemaster.com
----- Original Message -----
From: "Dave Brown" <[email protected]>
To: <[email protected]>
Sent: Tuesday, August 26, 2003 2:48 PM
Subject: Re: [TheForge] Heat Treating 5160 was Welding 5160

> At 00:28 08/26/03 -0700, you wrote:
> >Interested parties:  Transformation time from pearlite and ferrite to
> >austenite is a function of the mass of the piece, rather than its
alloying,
> >assuming critical temp is reached.   <snip>
> >I have not been able to get even very thin w-1 knife blades to fully
harden
> >in five minutes at critical, as measured by pyrometer, using oil quench.
>
> Just out of curiosity ... Why would you quench W-1, a steel designed for
> water hardening, in oil?  I would think that would contribute
significantly
> to your not reaching full hardness when you quench it.  Why not just
quench
> in water?
>
> <snipped a ton of other stuff not needed for this question>
>
> Dave Brown
>
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