METHOD FOR PRODUCING HIGH-PERMEABILITY ANISOTROPIC ELECTRICAL STEEL Russian patent published in 2017 - IPC C21D8/12 H01F1/16 

FIELD: metallurgy.

SUBSTANCE: smelting of steel containing copper from 0.4 to 0.6 wt % of copper, casting, hot rolling, etching, two-fold cold rolling with intermediate decarburizing annealing, application of magnesia coating to the strip, high-temperature and straightening annealing. Before the decarburization stage of the strip in the intermediate thickness, it is heated to 700-980°C at a rate of not less than 100°C/s in oxidizing atmosphere and cooling in oxidizing atmosphere to 600-840°C at a rate of not less than 60°C/sec immediately after reaching the maximum temperature at the heating stage.

EFFECT: provide high magnetic permeability of steel and uniformity of magnetic properties.

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