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In the production process of galvanized coil, alloying is a process of directly annealing the zinc layer after galvanizing the strip. Technically, when the strip is heated to 500-550 ° C in the alloying furnace, the pure zinc coating reacts with the iron phase in the steel matrix to form a zinc-iron alloy layer. Zinc-plated alloyed products are widely used in the automotive industry because of their attractive appearance and excellent coating properties and weldability. In particular, its superior corrosion resistance is deeply favored by users.
The technical quality department of Maanshan Iron and Steel Co., Ltd. and the cold rolling inspection room, the galvanizing branch, the production department planner and the foreign SV discussed the speed control, Fe content control and alloying in the production organization mode and production process. Detailed issues such as soaking temperature feedback have been thoroughly explored, and finally a set of specific implementation plans for commissioning has been formed. After careful deployment and coordination, the Maanshan Iron and Steel Co., Ltd. started the No. 1 galvanizing line for the production of auto sheets and put into trial production of new zinc-iron alloy products. During the trial production process, the operators and technicians communicated with the foreign SV at any time, and successfully solved the technical problems of iron content control, alloy furnace power and line speed, automatic control of strip specifications. through
Recently, the technical center of Maanshan Iron and Steel Co., Ltd. carried out strict system inspection on the zinc-iron alloyed galvanized coils produced by the steel rolling galvanizing line in the new district. The cup convex test, surface topography scan, Fe content energy spectrum analysis and mechanical property test results all meet the technical requirements of alloying products, which indicates that Maanshan New District products have successfully filled the gap in the field of alloying production and galvanized them. The follow-up of the line has produced valuable experience in the production of automotive panels.