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 widely and can reverse polarity many times along a single edge or face of a cut block. I have measured mag before and after cutting with a gaussmeter and it definately increases after sawing. I cannot find any literature to explain why sawing would induce mag into steel alloys. Any info?
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