Magnetic Properties of Tool Steel H13

[Kemag]

Hi all,

The tool steel H13 is a Fully Magnetic material. But no magnetic properties data could be found.

Any body has used it in magnetic design? What are the permeability and B-H curve.

Thank you in advance for any inputs.

Key

 

[MagMike]

I've never modeled that type of tool steel. Can you find and post the chemical composition? If you only need a rough estimate, maybe someone here can "guesstimate" the properties based on chemical composition.

Keep in mind: Tool steels are not processed to control the magnetic properties. There are likely to be significant differences in magnetic properties from lot to lot.

 

[Kemag]

Magmike,

Thank you very much for your response.

The Chemical composition of H13:
0.41%C, 5.35%Cr,1.4%Mo, 0.35%Mn, 1.0%Si, 0.90%V, balance Iron.

How much permeability might be guessed per the compositions?

 

[MagMike]

My copy of Bozorth's book indicates annealed 0.4% Carbon steel has a maximum permeability of 2000.

Tool steel is not likely to be annealed so that'll reduce the permeability
The chromium content will further depress the permeability
The silicon content will help increase the permeability, but probably not enough to offset the effect from the chromium.
Molybdenum and Vanadium will also play a role, but minor compared to the chromium and vanadium.

I would estimate a maximum permeability of 1000 to 1500.

Hope this helps.

 

[EdStainless]

Isn't there data in Bozorth for 3-4% Cr steels?
I am moving offices and mine is packed away.
They used to use Cr steels for permanent magnets, so I would guess that the 'soft' properties will be rather bad.

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Plymouth Tube

 

[MagMike]

Good idea Ed! I checked Bozorth, as well as the rest of the magnet books in my library. All of them treat chrome-steels as permanent magnets and thus all the tables focus on the Br, Hc and BHmax values.

However, Bozorth has a chart of a demag curve for 1.0% Cr and 3.5% chromium steel magnets. Both curves are non-linear in the 2nd quadrant and I estimated the recoil permeabilily varied between 200 and 500. The maximum permeability in the 1st and 3rd quadrants are likely to be a little higher, maybe 600 to 700.

Kemag, if you need something more accurate than these estimates, I encourage you to get them measured. I've used the services of KJS Associates in the past.

 

[EdStainless]

How come I can remember stuff like this and not my wife's birthday?

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Plymouth Tube

 

[Kemag]

Thank Mike and ED.

Our indirect measurement from inductance data seems suggest less than 100 in 1 Oe range.