[TheForge] carbon banding in 52100 steel

[Lon Humphrey]

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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