[TheForge] carbon banding in 52100 steel

[Ron Childers]

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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>
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