Slab heating method of oriented electrical steel sheet to reduce edge crack of hot rolled sheet

摘要

The present invention relates to a slab heating method of a grain-oriented electrical steel sheet to reduce the edge crack of the hot rolled sheet of the manufacturing method of the grain-oriented electrical steel sheet used as iron cores of transformers, stop equipment, rotary equipment, etc., weight ratio C: 0.04 ~ 0.08, Si: 2.9 to 3.3%, Mn: 0.06 to 0.08%, S: 0.02 to 0.03% and S-A1: 0.02 to 0.03%, N: 60 to 120 ppm and other inevitable added impurities The oriented electrical steel slab made through steelmaking and continuous casting is heated to a temperature of 1350 ~ 1430 ℃, and then hot rolled, and finally insulated coated through pre-annealing, cold rolling, de-carbon annealing, and high temperature annealing to produce oriented electrical steel sheets. The slab heating furnace has a heating rate of 6 to 20 ° C / min in the temperature range of 300 to 900 ° C during the heating temperature.