On Friday, April 14, 2017 at 6:18:05 PM UTC-7, m hammond wrote:
Do you want it magnetically soft? Hard? Permeable to AC fields?
The use of a piece of steel as a magnetic pole piece means you want low-carbon
steel, fully annealed (don't work the steel after annealing). There's lots of
other magnetic properties for various situations, like grain-oriented silicon
steel for two-dimensional AC magnetic field circuits.
I presume that you mean that you want the steel to *conduct* the
magnetism, not to retain a magnetic field, or you would not need to
place a magnet in it.
For that purpose -- a mild (unhardened) steel is good, and
something really expensive, like Mu-metal is much better.
Hardenable steel -- if hardened and cooled with a magnetic field
applied will hold it quite well. Permanent magnets used to be be made
that way. These days, the exotic materials formed with powder metalurgy
or ceramics are better.
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