4130 will be magnetic for use in a solenoid but it will retain that
magnatism quite well. Plus I can think of a lot of steels that will
machine a LOT better than 4130.
Well the plunger is spring loaded, so it will retract back when the
solenoid is not energized. Though I would prefer something that is poor
at retaining magnetism. Do you have a type off the top of your head ?
Carbon not only pins the iron crystalline structure in place
mechanically, it also does so magnetically -- so high strength steels
tend to be magnetically 'hard' as well.
Silicon stiffens up steel but makes it brittle -- however, it does so
without affecting the magnetic properties much. So the laminations in
transformer cores and motor armatures are generally made with silicon steel.
Look for silicon steel, magnet steel, or lamination iron. I have never
seen this available in anything other than flat sheet -- I don't know if
it's because the stuff is used for laminations, or if it is really only
workable in flat sheets. IIRC it is bendable enough that you should be
able to roll it, however.
In the end you may not have that much problem with the residual
magnetism. I suspect that your solenoid core will pick up iron filings
but won't 'stick'. You'll have to give it a try.
The carbon in 416 is to high - you want 316L or 304L or 317L.
You want an austenitic stainless steel - essentially non-magnetic in the
Can be hardened only by work hardening.
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Harold and Susan Vordos wrote:
I thought that he was asking about a material for making the
tube in which the plunger travels, and if so, a magnetic material will
shunt most of the field away from the plunger, requiring a much stronger
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The magnetic stainless used in solenoid valves is 430.
Ordinary mild steel will work fine for DC solenoids. The higher
saturation flux density and permeability of "magnetic" silicon steel
won't make much difference in a solenoid because the magnetic
properties will be largely dominated by the airgap.
For AC solenoids you'll want laminations to avoid eddy current heating
Good point about the heating. There's a lot to solenoid design. It
that plunger is going to have something soft on one end, for a seal, you
definitely have to deal with heat. And particualarly it the solenoid,
when energized is going to STOP a fluid flow. That heat may have no
where to go.
Don Foreman wrote:
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