The production process of Cold Rolled Non-Oriented Silicon Steel is a complex and delicate process involving multiple key steps to ensure the high quality of the final product. The following are the main steps of the Cold Rolled Non-Oriented Silicon Steel production process:
Raw material preparation:
This step mainly involves the selection and preparation of silicon steel raw materials. The main components of silicon steel include iron, silicon and other alloying elements, of which the silicon content is usually between 0.5% and 3.0%. The selection of raw materials is crucial to the quality and performance of the products in the subsequent production process.
Smelting:
Smelting is an important link in the production process. The main purpose is to remove impurities from the raw materials and adjust the content of alloying elements to meet the performance requirements of silicon steel products. The smelting temperature needs to be controlled during the smelting process, and appropriate amounts of alloying elements such as manganese and aluminum need to be added.
Continuous casting and electromagnetic stirring:
The smelted molten steel is formed into a continuous casting billet through a continuous casting machine. In order to improve the surface quality of the silicon steel product and prevent the occurrence of corrugated defects, electromagnetic stirring is used during the continuous casting process. Electromagnetic stirring can destroy the columnar crystallization zone, increase the proportion of equiaxed crystals, and improve the purity and surface quality of silicon steel products.
Hot rolling:
Hot rolling is the process of heating the continuous casting billet to a certain temperature and then rolling it through a hot rolling mill. The purpose of hot rolling is to roll the continuous casting billet into a steel strip of a certain thickness and improve its internal structure and performance.
Pickling:
Pickling is the process of removing the scale and other impurities on the surface of the steel strip after hot rolling. Pickling can improve the surface quality and subsequent processing performance of the steel strip.
Cold rolling:
Cold rolling is the process of rolling the pickled steel strip at room temperature. Cold rolling can further reduce the thickness of the silicon steel sheet and improve the surface flatness and dimensional accuracy. According to product requirements, the cold rolling process may include one or more cold rolling and intermediate annealing.
Annealing:
Annealing is an important step to improve the internal structure and performance of silicon steel sheets. Through annealing, the residual stress generated during the cold rolling process can be eliminated, and the magnetic permeability and magnetic saturation induction intensity of the silicon steel sheet can be improved.
Insulation film coating and finished product:
The last step is to apply an insulating film to protect the silicon steel sheet from corrosion and damage. After coating, the silicon steel sheet is cut into the required size and shape to become the final Cold Rolled Non-Oriented Silicon Steel product.
