METHOD OF HEAT TREATMENT OF ANISOTROPIC ELECTRICAL STEEL IN BELL-TYPE FURNACE Russian patent published in 2002 - IPC

FIELD: ferrous metallurgy; making of anisotropic electrical steel and up-dating of heat treatment of strip steel in bell- type furnaces. SUBSTANCE: proposed method includes forming stack of rolls by arranging them in one or two tiers on circular disks of support, laying members made from material similar to material of rolls on upper end faces of rolls overlapping these end faces; method includes also high-temperature annealing. Innovation of invention consists in forming additional distributed load on upper end faces of rolls equal to 0.15 to 0.60 g/sq. cm applied before annealing; this load is created by placing layer of loose material on upper end faces of rolls. EFFECT: improved quality of insulating coat of strip by retarding process of moisture removal from near-edge areas of rolls. 2 cl, 1 dwg, 1 tbl, 1 ex