Method for preventing 9Ni steel lower surface coating from being damaged

The invention belongs to the technical field of metal rolling, and particularly relates to a method for preventing a 9Ni steel lower surface coating from being damaged, which comprises the following steps: placing a plurality of square timbers with the same height on the lower surface according to the width of a steel billet after the steel billet is brushed with a coating and the maintenance is finished, so as to facilitate the penetration of a plastic steel belt during bundling; a paperboard is placed on the square timber, the width of the paperboard is not smaller than that of the steel billet, and the length of the paperboard is not smaller than the steel billet length plus the steel billet thickness; a plastic steel belt is used for bundling in the length direction, and a packing buckle is located on the side face; after the steel billet is lifted, square timbers are placed along the width; a plastic steel belt is used for bundling in the width direction, and a packing buckle is located on the side face;