Temperature effect on magnetism.

[sallyedmonds]

Temperature effect on magnetism.

The curie point for mild steel is about 750deg C. Before this temp it is ferromagnetic and after that temp its paramagnetic i think. But my question is does the magnet permiabilty of the mild steel gradualy reduce as it gets hotter up to that temp?



If we say Mild steel permiability is 100% at 20deg C what percentage would it be at say 400deg 500deg 600deg...

Is there a graph we can plot that show this? or is it 100% up to749Deg and then suddenly bang its not?

Hope you can help

Sally

 

[Splinter-Cat]

I believe that the magnetic permissibility of steel (or any other compound) is constant.

Also, I do not believe that magnetic permeability has anything to do with magnetization temperature (ie your 750 deg C example). Neither curie's law, or the equations for curie's constant include permeability as a variable.

Magnetic permeability is a measure of how easy it is for magnetic fields to pass through materials. Some materials have high permeability, and can transmit magnetic fields quickly; and others have low permeability, transmitting incident fields slowly.

While steel's ferromagnetic and paramagnetic properties can be changed with temperature, I do not believe its permeability is.