1. In the semi-continuous and slab, when using short blank to produce steel plate, free rolls of sufficient strength and flexibility should be set between the stand rolls so that the shorter blank can pass smoothly.

2. In order to obtain a better descaling effect, the high pressure water descaling system should reasonably select the nozzle structure shape, nozzle spacing and scattering Angle besides increasing pressure. In order to ensure safe operation, the high pressure water descaling device installed before and after the descaling machine must have a seal cover to prevent the splash of high pressure water and oxidized iron sheet. There should be an opening indication on the ball mill.

3. In addition, the cooling of the ball mill and the lubrication of the transmission part are also important.