Heat treatment of cold-rolled narrow strip steel for packaging steel strip manufacturers

Heat treatment of cold-rolled narrow strip steel for packaging steel strip manufacturers
　　 Heat treatment is a process to change the internal structure of steel through heating, heat preservation and cooling methods, thereby improving the performance of steel.
　　The proper coordination of cold rolling deformation and heat treatment of cold-rolled narrow strip steel enables its performance to meet the needs of users in a wide range, so most of the narrow strip steel is delivered in a heat-treated state. For example, carbon structural steel cold bands are divided into soft, semi-soft and chilled; high-quality carbon structural steel cold bands are divided into chilled and annealed; spring steel and tool steel cold bands are divided into chilled, annealed and spheroidizing; low-carbon cold bands are divided into Extra-soft, soft, semi-soft, low-hardness and cold-hardness; stainless steel and heat-resistant steel cold belts are divided into soft, semi-cold work hardening, cold work hardening and special cold work hardening steel belts. In the middle of the two rolling passes, the strip needs to be subjected to an intermediate softening heat treatment to facilitate re-rolling. In some cases, the billet needs to be annealed, such as alloy steel, stainless steel and some high-carbon steel billets need to be heat treated to obtain a plastic structure suitable for cold rolling. It can be seen that heat treatment is important for cold-rolled narrow strip steel. The heat treatment methods of cold-rolled narrow strip steel are mainly recrystallization annealing, spheroidizing annealing and solution treatment. Among them, annealing is the most widely used form of heat treatment, and the bell furnace is the most widely used heat treatment equipment.
　　 The purpose of annealing is to eliminate the work hardening of cold-rolled strip steel. Reduce the hardness, soften the metal, and restore the plastic deformation ability of the strip to facilitate further cold rolling or other processing; the second is to improve the structure and produce the required crystals. Grain size and orientation. Through the control of temperature and time, the crystal grains have a certain size and shape, thereby improving the mechanical and physical properties of the steel.