Values are listed in text format so you can copy them and paste them
into applications. The data are from a variety of sources, and an effort
has been made to ensure consistency. Nonetheless, Field Precision makes
no claims about the accuracy of the values and accepts no
responsibility for applications of the data. You are welcome to use them
as is. If you have better values or find an error, please contact us at
techinfo@fieldp.com. The following materials are included:
- Armco
- Cast iron
- Cast steel
- Cobalt
- Iron 1018
- Magnet steel
- Magnetite
- Nickel
- Pure iron
- Sheet steel
- Silicon steel
- Soft iron
- Steel 50H470
- Steel1008
- Steel1010
- Steel1018
- Steel1020
- Steel1030
- Tungsten steel
For the soft materials, the value of relative magnetic permeability is defined as
Mur = B/B0 = B/(mu0*H) [1]
where the total magnetic flux density
B is in tesla and the magnetic field
H is in A/m. The quantity
B0 is the applied magnetic flux density and has units of tesla. Magnetic materials saturate at high values of
B.
The maximum contribution that a material can make to the total flux
density occurs when all domains are completely aligned. The contribution
is called the saturation flux density
Bs. At higher fields, the total flux density is the sum of the peak material contribution and the applied flux density:
B = B0 + Bs. [2]
In this limit, the relative permeability is
Mur = B/(B-Bs). [3]
At high field, Eq. 3 implies that the saturation flux density is given by
Bs = B – B/Mur. [4]
Some of the tables contained high enough values of
B that is was possible to identify a consistent value of
Bs from Eq. [4]. For these cases, we used Eq. 3 to extend the table to a standard value of
B = 10.0 tesla to aid in the convergence of nonlinear numerical solutions.
