Why is it preferable to use lightweight aluminum alloy idler rolls to transport galvanized steel pipes onto the cooling bed after external blasting and wiping of zinc?

After galvanized steel pipes undergo the external blasting and wiping of zinc surface treatment, the final finishing process for the galvanized layer is completed. However, since the pure zinc layer has not yet solidified at this point, it is prone to scratching if not handled carefully, which can damage the surface quality of the galvanized layer. If active roller conveyors are used, or if the pipes are rolled on inclined platforms, the former can produce relative movement with the galvanized steel pipes and scratch off the pure zinc layer at the contact points; the latter can also lead to the same situation, scratching off the pure zinc layer at the contact points. Therefore, as long as there is no relative movement between the galvanized steel pipes and the roller surfaces they contact, the pure zinc layer can be ensured not to be scratched off. To achieve this, only lightweight aluminum alloy idler rolls can be relied upon for transfer. Due to their lightness, they can be driven by the forward friction force of the galvanized steel pipes, resulting in virtually no relative movement at the contact points. Therefore, there will be no phenomenon of the pure zinc layer being scraped off and scratched. This method has been used in actual production for more than 20 years, and the results are extremely satisfactory.