A NEW HOT-ROLLING METHOD IN FULLY FERRITIC REGION FOR PREPARING HOT-BAND TO PRODUCE CRGO STEEL

摘要

Cold rolled grain oriented steels (CRGO) are used as transformer core material as they have very low core loss and high magnetic flux density. These electrical and magnetic properties of CRGO steels are obtained through high silicon content (3%) and large grains having {110} texture, known as Goss texture. The present invention describes a casting-rolling method to prepare hot-strip for Fe- 3.2Si CRGO that will contain Goss nuclei. This method involves four-stage hot-rolling starting at 950 °C. After hot-rolling the strip is air-cooled to room temperature and subsequently annealed in the temperature range of 900-950ºC for 5 minutes to produce annealed hot band which is as stock material for production of cold rolled grain oriented steel.