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Help finding the magnetic properties for 440C
2

Help finding the magnetic properties for 440C

Help finding the magnetic properties for 440C

(OP)
Hi.  Does anyone know of a source for the magnetic properties of SS type 440C?  Thanks.

RE: Help finding the magnetic properties for 440C

Try the "Handbook of Stainless Steels" by Peckner and Bernstein (1977). A very comprehensive resource book on stainless steels.

RE: Help finding the magnetic properties for 440C

(OP)
Thanks for the reference.  I will try to look this one up soon.  By the way, are there any web references that would have the same info?

RE: Help finding the magnetic properties for 440C

I tried to look it up for you in the Handbook, but these properties aren't given for the martensitic grades. They must vary too much with microdtructure.

RE: Help finding the magnetic properties for 440C

(OP)
Oh, okay.  Thanks for the heads-up on that.  Now where can I secure this sort of information?  Should I try contacting steel vendors?

RE: Help finding the magnetic properties for 440C

Yes, I would go to either Cartech or Allegheny, if you are sourcing in the US. It will take an email. I don't think it's on their sites.
One more thing to put in the new book.

RE: Help finding the magnetic properties for 440C

440C is not usually used in magnetic devices so I doubt anyone has the info readily available.  If you buy significant quantities from Carpenter, they will make magnetic measurements of the material in your heat treated condition.  If you find anything, post it here please!

RE: Help finding the magnetic properties for 440C

(OP)
Well, I tried to contact the 2 suppliers listed above and haven't heard from them yet.  I wonder if there is another type of SS with similar known magnetic properties.  Anybody know??

RE: Help finding the magnetic properties for 440C

You use 440C when you need a corrosion resistant tool steel.  What properties do you need?
Hardness?
Corrosion resistance?
Magnetic?  What type of magnetic properties are you concerned about?

= = = = = = = = = = = = = = = = = = = =
Corrosion never sleeps, but it can be managed.
http://www.trenttube.com/Trent/tech_form.htm

RE: Help finding the magnetic properties for 440C

(OP)
I need the magnetic permeability, residual induction (Br), coercivity (Hc), and saturation magnetization.  If anyone can help, that would be swell.  Thanks.

RE: Help finding the magnetic properties for 440C

Are there any Cartech folks or customers in this forum? It would seem to me that this data would be available in-house, if not published.

RE: Help finding the magnetic properties for 440C

Here is the FSU Magnet Lab’s website you might contact them for the required information.  They may have it or certainly should be able to direct you in the right direction.  The are several other high magnetic field government labs around.

http://www.magnet.fsu.edu/

RE: Help finding the magnetic properties for 440C

Proto, My question is, "Are you stuck with 440C and need to know what properties to expect?" or, "Do you need specific ferromagnetic properties and are looking at using 440C".

The Br and Hc will be dependent on the heat treatment.  This could cause some large variations.

= = = = = = = = = = = = = = = = = = = =
Corrosion never sleeps, but it can be managed.
http://www.trenttube.com/Trent/tech_form.htm

RE: Help finding the magnetic properties for 440C

(OP)
Yep, I'm stuck with 440C (Q&T @ 600 deg. F) and want to know what properties it has (ballpark).

I tried to contact cartech and they said that they wouldn't know because it usually doesn't come up in typical applications of 440C and that the info should be in the public domain.  However, I haven't found anything yet.

RE: Help finding the magnetic properties for 440C

Well, I can find old data for Cr and W steels, but....
It is assuming that they will be used as permanent magnets in the full hard condition.
I have no data on the effects of tempering.  My hunch is that the Br will increase and the Hc decrease.  No idea by how much though.
You are going to need to have some samples tested.
You might try contacting Walker Magnetics or Magnetic Instrumentation http://www.maginst.com/
They both build test equipment and I am sure that for a nominal charge they would do some testing for you, or at least send you to one of their customers that could do it.

= = = = = = = = = = = = = = = = = = = =
Corrosion never sleeps, but it can be managed.
http://www.trenttube.com/Trent/tech_form.htm

RE: Help finding the magnetic properties for 440C

(OP)
Woould you happen to be able to provide that data for CR and W steels?  I have a reference that says that the Br for Cr steels is ~10 kilogauss = 1 T which seems to be of the right order, but what about the permeability and coercivity?

RE: Help finding the magnetic properties for 440C

Here is a web site that could provide some useful information. It was the only one I had found that actually provides magnetization curves for a wide range of materials;

http://emat.eng.hmc.edu/database/database.htm

RE: Help finding the magnetic properties for 440C

metengr

The BH curves in this web site was taken from the ASM metals handbook revision 8

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