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Zawada NDT
Suppliers of instruments to test steel wire ropes in-situ, using magnetic, non-destructive method.
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Technical Discussions
Elmar van den Elzen
Elmar van den Elzen
06:17 Jan-12-2000
magnetism in steel

Dear Sirs,

For a customer we inspect steel rolls (3% chrome) for cold rolling steel strip. In the heavily stessed zones of the roll, where the roll material has probably been deformed, magnetism is introduced. This magnetism is finely distributed and the magnetism extends at least several millimeters into the roll body.

We would like to know the cause of this effect.
- Could magnetism be introduced into steel by local deformation?
- Or is it likely that an external magnetic field can be 'frozen' into the material by deformation?

We would appreciate any help to understand this fenomenon or hear from any cases with similar effects observed.

Thank you,
Lismar Engineering,
Elmar van den Elzen



 
 Reply 
 
Jens Forker
Jens Forker
07:00 Jan-12-2000
Re: magnetism in steel
: We would like to know the cause of this effect.
: - Could magnetism be introduced into steel by local deformation?
: - Or is it likely that an external magnetic field can be 'frozen' into the material by deformation?

<<


 
 Reply 
 
Thomas David Koble
Thomas David Koble
02:39 Feb-01-2000
Re: magnetism in steel
Dear Elamr,

knowing the chrome content, I suppose that the steel is a ferromagnetic material.

It is well known that magnetostriction occures in ferromagnetic materials.
This means that the shape and length of the matrial changes if the magnetization changes and vice versa.
From my point of view this is what you are observing.

For more infromation please look for articles on:
magnetostriction, magnetomechanical effect, magnetoelastic effect
(different names for the same physical effect !)

Best regards

Dag

Thomas


: Dear Sirs,

: For a customer we inspect steel rolls (3% chrome) for cold rolling steel strip. In the heavily stessed zones of the roll, where the roll material has probably been deformed, magnetism is introduced. This magnetism is finely distributed and the magnetism extends at least several millimeters into the roll body.

: We would like to know the cause of this effect.
: - Could magnetism be introduced into steel by local deformation?
: - Or is it likelythat an external magnetic field can be 'frozen' into the material by deformation?

: We would appreciate any help to understand this fenomenon or hear from any cases with similar effects observed.

: Thank you,
: Lismar Engineering,
: Elmar van den Elzen





 
 Reply 
 

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