PROCESS OF MANUFACTURE OF STRIPS FROM ELECTRICAL SHEET STEELS Russian patent published in 2004 - IPC

FIELD: metallurgy, specifically, manufacture of strips from electrical sheet steels used in fabrication of magnetic cores of electric motors. SUBSTANCE: technical result of invention consists in increased output of good strips and in reduction of expenses for their production. Proposed technical result is achieved as process of manufacture of strips from electrical sheet steels of various groups of alloying with silicon and aluminum includes cold rolling of semi-finished rolled stock, recrystallization annealing of cold-rolled strip, dressing or no dressing of annealed strip and certification annealing of strip in batch furnace. Content of aluminum in steels of various groups of alloying is established equal to: Alloying group ( Si+Al), per cent by mass Content of Al in steel, per cent by mass Carbon steel <0.5 not more than 0.05 Low-alloyed steel 0.5-0.8 0.05-0.20 Slightly-alloyed steel 0.8-2.1 0.10-0.30 Medium-alloyed steel 1.8-2.8 0.15-0.30 Upgraded alloyed steel-a 2.5-3.8 0.20-0.35 Upgraded alloyed steel-b 2.8-3.8 0.25-040 Recrystallization annealing of cold-rolled strips is carried out at temperature of 600-900 C. EFFECT: increased output of good stripes, reduced production expenses. 1 tbl