The cold rolling of galvanized H-shaped steel requires higher methods and technical standards. Galvanized H-shaped steel manufacturers believe that when manufacturing large and medium-sized H-shaped steel, they should fully prepare from the following aspects and effectively manipulate various hazardous factors throughout the production process.

The effective reduction allocation is. The thickness of the feeding beam end of the BD extruder should be minimized as much as possible, which not only reduces the deformation of the beam end and flange during full cold rolling, but also helps to ensure that the flange specifications of the head and tail parts of the rolled piece are qualified.

The main and secondary foundations of the front side track of the universal extrusion machine are thinned at the beam end, and the cold rolling force needs to be large. The vertical rollers are relatively pressed down; Carry out leveling roll and vertical roll cold rolling with uniform cold rolling force in the middle pass; The last two passes will carry out small pressure on the beam end, and the cold rolling force will be small, so that the tensile strength of the flange exceeds the beam end, and the beam end will be subjected to tensile ground stress.

The temperature drop control at the beam end can be achieved from two levels:cold rolling and cooling. The geometric specifications of the rolled piece should be controlled according to the positive error of beam end thickness and negative error of flange thickness during cold rolling. In addition, there is a certain amount of pressure reduction at the beam end in the final two passes, allowing the beam end to cause deformation heat to compensate for temperature drop.