DEVICE AND METHOD OF SHEET NITRIDING FROM REGULAR GRAIN ORIENTED STEEL Russian patent published in 2017 - IPC C23C8/38 

FIELD: metallurgy.

SUBSTANCE: proposed line comprises nitriding zone for nitriding the said strip, a cooling zone for cooling the said strip and a heating zone for heating the said strip, located before the nitriding zone. The nitriding zone comprises positive electrodes disposed opposite the strips to generate a glow discharge, and negative electrodes disposed between the positive electrodes and the strip to generate a glow discharge. Between the positive and negative electrodes, a glow discharge is generated to form a plasma for nitriding the strip. In a particular case, the said line is made with interior nitriding zone, divided by width into strips to provide separate nitriding control within each of the divided zones. The stated method of nitrided sheet manufacturing from regular grain oriented steel is implemented using the stated link, wherein after cold rolling and before secondary recrystallization annealing, continuous plasma nitriding is performed in the strip glow discharge of grain oriented steel using the stated line.

EFFECT: nitriding degree control is ensured with high accuracy, the time is decreased required for processing, to improved magnetic properties throughout the strip are obtained.

15 cl 3 dwg