Rolling process control of A572Gr65 steel plate

A572Gr65 steel plate requires hot rolling or controlled rolling state delivery. In order to ensure good low temperature impact toughness, a strict two-stage controlled rolling process is adopted.
In the rough rolling stage, high-temperature fast rolling is used with large reduction, and the reduction in the first two passes is greater than 25mm to ensure rolling penetration, promote repeated deformation of austenite grains, and refine the grains; in the finishing rolling stage, the opening rolling temperature Less than 950 degrees Celsius, reducing the impact of mixed crystals on the performance of A572Gr65 steel plates. The finishing rolling temperature of A572Gr65 steel plates with a thickness less than 16mm is 830~860 degrees Celsius, and the finishing rolling temperature of A572Gr65 steel plates with a thickness of 16-32mm is 840~870 degrees Celsius.