[TheForge] Harden & temper

[Bruce Freeman]

In general, adding a substance to water lowers the freezing point and
raises the boiling point.  Antifreeze/antiboil, for example.

On Fri, Jun 17, 2011 at 2:51 PM, Ron Childers <ron at munlaw.net> wrote:
> I thought soap lowered the boiling point; so does sugar...
>
> -----Original Message-----
> From: theforge-bounces at mailman.qth.net
> [mailto:theforge-bounces at mailman.qth.net] On Behalf Of peter fels
> Sent: Friday, June 17, 2011 2:30 PM
> To: Blacksmithing List Sponsored by ABANA
> Subject: Re: [TheForge] Harden & temper
>
> Quenching in a pressurized vessel to rise the boiling temperature?
>
> On Jun 17, 2011, at 10:32 AM, Jerry Frost wrote:
>
>> Salts and caustics also raise the boiling temp of water.
>>
>> As I read the part of the article I could, I gathered the benefit of
> this
>> type of heat treat process is it yields a tough yet malleable result.
>>
>> Of course I could've missed something, I skimmed the article and got
>> distracted by graphenes. <sigh>
>>
>> Jer
>> ----- Original Message -----
>> From: "David E. Smucker" <davesmucker at hotmail.com>
>> To: "Blacksmithing List Sponsored by ABANA" <theforge at mailman.qth.net>
>> Sent: Thursday, June 16, 2011 6:29 PM
>> Subject: Re: [TheForge] Harden & temper
>>
>>
>>> All quenching with a water based quenchent above 212 F is based on
> the
>>> physics of flashing water to steam.  For this to be really fast we
> must
>>> prevent a stable steam film insulating the surface.  This is what
> brine
>>> does, this is what a caustic solution does, this is what "super"
> quench
>>> does
>>> (there is nothing "super" about super quench), this is what high
> velocity
>>> sprays do.  All of the above are very close to twice as fast as still
>
>>> water
>>> with limited movement of the part.
>>>
>>> In sheet applications, (continuous web moving in a process line),
> plain
>>> water sprays are hard to beat on an effective cost bases.  If we are
>>> making
>>> auto sheet -- there is no other bases than cost.
>>>
>>> Dave Smucker
>>>
>>
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-- 
Bruce
NJ