[TheForge] Re: Timken Case Hardening

[Lon Humphrey]

im a millwright and all of the stuff we change out we throw out back in a 
large scrap bin....Fafner,link belt, fag, just to name a few off the top of 
my head...they dont rust

----- Original Message ----- 
From: "David E. Smucker" <davesmucker at hotmail.com>
To: "Sponsored by ABANA" <theforge at mailman.qth.net>
Sent: Thursday, March 20, 2008 9:11 PM
Subject: Re: [TheForge] Re: Timken Case Hardening


> Lon, you maybe correct but I have never seen large bearings from 
> stainless -- now all of the bearings I was buying where 10 inch OD and 
> larger  -- about $ 2,000,000 worth per year.  I retired in 2000 so their 
> maybe more stainless bearings out there than I know about but I am not 
> sure why you would go with stainless except for high temperature 
> applications and marine applications (salt water).  Also rod end bearings 
> for hydraulic cylinder might call for stainless.  Where are you finding 
> scrap stainless bearings -- it might be interesting to get my hands on 
> some.
>
> Carpenter makes a series of 440C type stainless for bearing applications. 
> They have 4 different grades, two which are high carbon and two designed 
> for case hardening.  Here is a URL if you want to look at some of the 
> Carpenter specs.
>
> http://www.cartech.com/products/wr_products_bearing_steel.html
>
> Dave Smucker
>
>
> ----- Original Message ----- 
> From: "Lon Humphrey" <ironcrossforge at roadrunner.com>
> To: "Sponsored by ABANA" <theforge at mailman.qth.net>
> Sent: Thursday, March 20, 2008 12:06 PM
> Subject: Re: [TheForge] Re: Timken Case Hardening
>
>
>> nea...most of the bigger ones made today are some form of stainless thats 
>> why they wont rust...only if it rusts is it 52100
>>
>> ----- Original Message ----- 
>> From: "David E. Smucker" <davesmucker at hotmail.com>
>> To: <munlaw2 at hcsmail.com>; "Sponsored by ABANA" 
>> <theforge at mailman.qth.net>
>> Sent: Thursday, March 20, 2008 11:50 AM
>> Subject: Re: [TheForge] Re: Timken Case Hardening
>>
>>
>>> Almost all ball bearings are 52100.  Many ball and roller bearings by 
>>> SKF, Torrington, FAG are also 52100.  SKF and FAG may make some of their 
>>> very large bearings using case hardening.  I would think the same is 
>>> true for the Japanese bearing manufactures but I have no first hand 
>>> knowledge. Timken as it turns out makes most of the steel for a wide 
>>> range of manufacturers.  For Timken's own bearings they to the best of 
>>> my knowledge have all been case hardened.
>>>
>>> That doesn't mean that the Timken bearings are not good for making 
>>> tools, they are.  If forged down the outer layer is still high carbon 
>>> steel unless you grind it off because the case is so deep.  The inside 
>>> is like a 4120, very tough and strong.
>>>
>>> But keep in mind and this is a BIG BUT -- like all things made from 
>>> "scrap" they may fail because of defects from the parts service life. 
>>> For some, this is OK, but others may not want to risk it.
>>>
>>> Dave Smucker
>>> ----- Original Message ----- 
>>> From: "Ron Childers" <munlaw2 at hcsmail.com>
>>> To: "'Sponsored by ABANA'" <theforge at mailman.qth.net>
>>> Sent: Thursday, March 20, 2008 9:48 AM
>>> Subject: RE: [TheForge] Re: Timken Case Hardening
>>>
>>>
>>>> Some years ago I made a big knife out of an old axel bearing from a 
>>>> semi. I
>>>> was told it was 52100 and I tempered in oil. It chopped through a 2x4 
>>>> and
>>>> would still shave, so it must have been pretty good steel. Also made 
>>>> some
>>>> smaller blades out of car axel bearings and big ball bearings; same 
>>>> story.
>>>>
>>>> It must have been dumb luck that the bearings weren't Timpkin. Which
>>>> manufacturers use 52100 for their bearings? Machinery's Handbook must 
>>>> have
>>>> contacted Monmoth, Fag, or some other company for their information on
>>>> bearing steels.
>>>>
>>>> Ron C
>>>>
>>>>
>>>>
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>>
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