Hard Material with Low Magnetic Permeability
Hard Material with Low Magnetic Permeability
(OP)
Hello,
I have some processing equipment that wraps steel wire around our parts and once wrapped, twists the wire to secure it to the part and breaks off any excess wire. We are starting to see that the tooling is becoming magnetized as it twists this steel wire causing the excess wire to stick to the tooling creating other issues.
I am trying to find an alternative material with a low magnetic permeability but hardness comparable to the current tooling. The current tooling is made of SKD11 steel with a hardness of 61-63 HRC.
Currently I have been looking at material with hardness between 45 & 65 HRC.
Any suggestions on alternative materials?
Best Regards,
Ross
I have some processing equipment that wraps steel wire around our parts and once wrapped, twists the wire to secure it to the part and breaks off any excess wire. We are starting to see that the tooling is becoming magnetized as it twists this steel wire causing the excess wire to stick to the tooling creating other issues.
I am trying to find an alternative material with a low magnetic permeability but hardness comparable to the current tooling. The current tooling is made of SKD11 steel with a hardness of 61-63 HRC.
Currently I have been looking at material with hardness between 45 & 65 HRC.
Any suggestions on alternative materials?
Best Regards,
Ross





RE: Hard Material with Low Magnetic Permeability
RE: Hard Material with Low Magnetic Permeability
Nitronic 60 also remains almost completely non-magnetic in any condition, again not extremely hard.
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RE: Hard Material with Low Magnetic Permeability
Bruce
http://accuratus.com
RE: Hard Material with Low Magnetic Permeability
Considering that high Cr tool steels used to be used as permanent magnets I am not surprized at your issue.
I would suggest that you look at carbide or ceramic. Carbides with high binder content will be ferromagnetic (attracted to a magnet) but they don't retain the field.
If you need toughness look at some of the toughened zirconia ceramics.
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P.E. Metallurgy, Plymouth Tube
RE: Hard Material with Low Magnetic Permeability
Ceramicguy: We have been removing the tooling and demagnatizing it, however it becomes remagnatized about 3 weeks to a month later. It is an option for now, it just takes maintenance an hour to change the tooling so it is not convienient for production.
Currently I am getting the tooling quoted. The quote has MP35N (Nickel, Cobalt, Chromium alloy) 65% cold reduction as the material (suggested by CoryPad). This has a very low magnetic permiablity and a comperable hardness to SKD11 steel at about 48 to 52 HRC.
Thanks for the input! Keep'm comin'!!!
RE: Hard Material with Low Magnetic Permeability
RE: Hard Material with Low Magnetic Permeability
Hard magnetic materials are called permanent magnets. They resist demagnetization, and hence are used to create useful magnetic fields.
You could either use a material that is non-ferromagnetic, or one that is magnetically soft (though mechanically hard).
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P.E. Metallurgy, Plymouth Tube