The production process of S355 J2+N steel plate is usually combined with controlled rolling, and the heating system with low temperature is adopted, which can save fuel consumption. The rolling process is divided into three stages:
To eliminate the influence of slab surface and improve the accuracy of width control, 1 ~ 4 rolling steps are carried out along the length direction or oblique direction of slab. Roll the billet to the required thickness.
Widening rolling, which is different from other kinds of S355 J2+N steel plate rolling important process. In order to reach the width required by the rolled product specifications, the slab is rolled 90℃ along the width direction.
Finish rolling, extend rolling and then turn 90℃, turn back to the length direction of the original billet, rolling to the thickness of the finished sheet. Proper formulation of S355 J2+N steel plate rolling process can improve the production capacity of rolling mill, the quality and yield of S355 J2+N steel plate.
To ensure the flatness of the S355 J2+N steel plate, in addition to taking various measures to ensure the shape of the plate, the thickness of the S355 J2+N steel plate below 40mm each need to go through the hot straightening, cold straightening of the cold steel plate is not straight.
