The purpose and characteristics of controlled rolling

The main purpose of controlled rolling is to refine the grain structure, thereby improving the toughness of hot rolled steel. The main difference between conventional hot rolling and controlled rolling is that the former nucleates only on the austenite grain boundaries, while the latter nucleates within the grains and on the grain boundaries, resulting in a finer grain structure. . Controlled rolling has outstanding advantages over conventional rolling methods. It can be summarized as follows: (1) Many experimental data show that the comprehensive mechanical properties such as strength and toughness of the steel produced by the controlled rolling method have been greatly improved. For example, controlled rolling can refine the ferrite grains, thereby improving the strength and toughness of the steel. (2) Simplify the production process. Controlled rolling can replace normalizing isothermal treatment. (3) Due to the improvement of comprehensive properties such as strength and toughness of steel, it naturally leads to the expansion of the scope of use of steel and the increase of product service life. From the overall point of view of the production process, due to the simplification of the production process and the improvement of product quality, under suitable production conditions, the cost of steel will be reduced. (4) The equipment made of controlled rolling steel is light in weight, which is conducive to the lightening of equipment.