Annealing of sheet and strip steel can be divided into intermediate annealing and finished annealing. Additionally, for some alloy steels, such as stainless steel, hot-rolled sheet and coil also require initial annealing before cold rolling. The main purpose of annealing is to eliminate internal stress, reduce work hardening, improve microstructure and properties, and enable the material to meet the mechanical and technological properties as well as the microstructure requirements of the product. The annealing process mainly includes heating temperature, heating rate, holding time and cooling rate, etc. Due to the residual emulsion on the surface of the steel strip after rolling, volatilization, decomposition or carbon deposition will occur during annealing, which will affect the surface quality of the steel strip after annealing. Therefore, when formulating the annealing process, the impact of the emulsion during annealing on the surface quality of the steel strip should also be taken into consideration. Of course, the annealing methods, including continuous annealing, nitrogen-hydrogen or all-hydrogen bell annealing, also have a significant impact on the cleanliness of emulsion annealing. Comparatively speaking, the emulsion has a relatively small effect on the surface of the steel strip during continuous annealing.

     Continuous annealing technology is an important production technology for manufacturing high-quality and high-strength steel, and its key core technology is the rapid cooling technology after annealing. China has introduced rapid cooling technology. Currently, there is an urgent need for domestic digestion of the introduced technology and further innovation. Continuous annealing technology is also an important technique for controlling the quality of cold-rolled plates. In recent years, research on annealing process technology has mainly focused on the development of flexible annealing technology. The core idea is to utilize the control of temperature during the annealing process to alter the phase transformation process of steel, thereby obtaining different microstructures and properties to meet the diverse needs of users. Therefore, when designing the formula of the rolling emulsion, the changes in the annealing process should also be taken into account and adjustments should be made in a timely manner.

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