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Article: ATMOSPHERES FOR ANNEALING ELECTRICAL STEELS.

Article from:
Advanced Materials & Processes
Article date:
October 1, 1999
Author:
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Nitrogen-hydrogen-water atmospheres produced on-site have advantages over other candidates for annealing, decarburization annealing, and bluing of transformer and motor core laminations.

The prime requirement for the cores of transformers and of rotors and stators for electric motors is that they be magnetically soft and have little or no "retention"; that is, when magnetized in a magnetic field and then removed from that field, they lose all their magnetism. Electrical steels used for cores typically are extralow-carbon (ELC) grades (0.02%C) characterized by low hysteresis loss, low eddy current loss, high magnetic permeability, and high magnetic saturation ...

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