[TheForge] carbon banding in 52100 steel

Tue May 8 14:03:57 EDT 2007

im not sure but i dont think it would work...in the quench by that time the 
carbids would be in the solid state again....thats the reason you forge JUST 
below the critacle tep to get the alignment of the bands to the shpe of 
whatever your forging and also to fracture the grans to acheve the small 
tight granes but the thing that caught my atttion imedetly was the banding 
jumped as if it were a ladder pattern

i have no degree in metaurligy but if i am understanding things right thats 
what supposed to happen

----- Original Message ----- 
From: "Ben Barrett" <stircrazyben at gmail.com>
To: "Sponsored by ABANA" <theforge at mailman.qth.net>
Sent: Tuesday, May 08, 2007 1:55 PM
Subject: Re: [TheForge] carbon banding in 52100 steel


> Has anyone invoked sound waves into the quench?
> Here is a neat sample using cornstarch:
> http://www.c00lstuff.com/178/Non_Newtonian_fluid_under_vibration/
>
> here is a funny youtube link:  http://www.youtube.com/watch?v=f2XQ97XHjVw
> and a better reference:  http://en.wikipedia.org/wiki/Non_Newtonian_fluid
> (see other external links at the bottom of the wikipedia page, for
> better videos)
>
> enjoy,
>
> ben
>
> PS - I wonder what magnetic waves into a hot ingot, while cooling,
> would do -- surely the crystals can be aligned and even further
> shifted this way, as they are in nature :)
>
>
> On 5/8/07, Ron Childers <munlaw2 at hcsmail.com> wrote:
>> Did you differentially quench?
>>
>> -----Original Message-----
>> From: theforge-bounces at mailman.qth.net
>> [mailto:theforge-bounces at mailman.qth.net] On Behalf Of Lon Humphrey
>> Sent: Tuesday, May 08, 2007 1:01 PM
>> To: Sponsored by ABANA
>> Subject: Re: [TheForge] carbon banding in 52100 steel
>>
>> i put up pics on my 360 page
>>
>> take a look
>>
>> http://360.yahoo.com/redneck_43055
>>
>>
>> ----- Original Message -----
>> From: "Lon Humphrey" <ironcrossforge at roadrunner.com>
>> To: "Sponsored by ABANA" <theforge at mailman.qth.net>
>> Sent: Tuesday, May 08, 2007 12:51 PM
>> Subject: Re: [TheForge] carbon banding in 52100 steel
>>
>>
>> > it was made from NEW 52100 steel ....look in the McMaster Car book they
>> > sell it new
>> >
>> > ----- Original Message -----
>> > From: "David E. Smucker" <davesmucker at hotmail.com>
>> > To: "Sponsored by ABANA" <theforge at mailman.qth.net>
>> > Sent: Tuesday, May 08, 2007 12:28 PM
>> > Subject: Re: [TheForge] carbon banding in 52100 steel
>> >
>> >
>> >> Was your steel from new 52100?  or from a roller bearing race?  If 
>> >> from
>> >> new 52100 stock then I don't have a clue, but if from a roller bearing
>> >> race -- a Timken roller bearing race or even the roller then what you
>> >> have is not 52100 but deep case hardened steel.  The base steel is 
>> >> close
>> >> to a 4120 but in the case the carbon content is raised to levels 
>> >> similar
>> >> to 52100.  Not all roller bearings are case hardened, but all of 
>> >> Timken's
>>
>> >> are made this way.  Some other manufactures SKF, FAG, Torrington use a
>> >> mixture of 52100 and case hardening in "ROLLER" bearings.  As far as I
>> >> know almost all BALL bearings are 52100.  The use of case hardening in
>> >> the Timken Roller bearings is not to save money -- but to make a much
>> >> better bearing. Very tough core, with high hardness for the surface 
>> >> area
>> >> to a depth of close to 1/16 inch. If you look at an etched section
>> >> through a Timken race you can see the depth of the case hardening.
>> >>
>> >> Dave Smucker
>> >> ----- Original Message -----
>> >> From: "Lon Humphrey" <ironcrossforge at roadrunner.com>
>> >> To: "Sponsored by ABANA" <theforge at mailman.qth.net>
>> >> Sent: Tuesday, May 08, 2007 9:55 AM
>> >> Subject: [TheForge] carbon banding in 52100 steel
>> >>
>> >>
>> >>> hi all,    ive just made a knife from 52100....i heat thermal cycled 
>> >>> it
>> >>> 3 times and after the acid etch there is nice latteral banding 
>> >>> visable
>> >>> ....can somone explane to me what is going on with in the steel that
>> >>> makes the bands show up.....ive searched this online and come up with
>> >>> nil
>> >>>
>> >>> i was under the impression that the only type of steel that you could
>> >>> get the banding in was true damascus but i know Ed Fowler is getting
>> >>> this as well
>> >>>
>> >>> Lon
>> >>> _______________________________________________
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