DEVICE AND METHOD OF SHEET NITRIDING FROM GRAIN ORIENTED ELECTRICAL STEEL Russian patent published in 2017 - IPC C23C8/38 C23C14/06 C23C14/56 C23C14/24 

FIELD: metallurgy.

SUBSTANCE: line comprises nitriding zone for nitriding the sheet, a cooling zone for cooling the sheet, and a heating zone for heating the sheet disposed before the nitriding zone. Nitriding zone is provided with glow discharge electrodes, wherein a sheet is used as a negative electrode to be subjected to plasma nitriding by glow discharge, and glow discharge electrodes are used as positive electrode, arranged in the nitriding chamber. Nitriding zone is divided into separate zones in the proposed line in direction of sheet width for nitridation control inside each of divided zones. Manufacturing method is carried out using this line for nitrided sheet of grain oriented electrical steel, wherein after the cold rolling and before the secondary recrystallization annealing a continuous plasma nitriding from grain oriented electrical steel is carried out by glow discharge of sheet.

EFFECT: uniform nitriding of steel sheet, decreased time required to process steel sheet with stable obtaining of excellent magnetic properties throughout whole strip.

15 cl, 4 dwg