Yes, I agree that it is a surface condition. I have learned to demag via a "scrubbing" technique rather than coil wrapping because of the wide swings and inability to split the poles with a demag coil. I will investigate strain induced magnetism. Thanks!
So you are saying that the mag develops from hardening but these fields are balanced within the microstructure and do not show to any extent in the finished slab as supplied from the mill? I have never heard of a hardening process (quench and temper) also inducing magnetism. Is it because of...
We have invested in a demag device which I have used with varied success. Be aware that the incoming material before cutting are large slabs and not small pieces. Those incoming slabs from the steel mill show little mag. How does the sawing action induce magnetism? Annealed material does not...
We are a tool steel distributor of pieces for molds, dies, etc. After cutting large blocks with band saws some steels (especially prehardened alloys) develop residual magnetism to the extent that we get customer complaints of sticking chips during their machining processes. The field varies...
