Process parameters of strip using medium frequency induction annealing equipment for transverse magnetic field induction heating annealing treatment

The strip uses medium frequency induction annealing equipment for induction heating heat treatment. There are many factors that affect the heat treatment effect, such as annealing process, annealing parameters, etc. Therefore, it is very important to master the heat treatment process and parameters of strip induction annealing. Today, the technical staff of Zhengzhou Gao's will tell you about the process parameters of transverse magnetic field induction heating annealing treatment of strips.

Transverse magnetic field induction heating annealing treatment is mainly used for recrystallization annealing of cold-rolled low carbon steel strips and annealing to eliminate aging strain phenomena. The purpose of recrystallization annealing is mainly to improve the plasticity and toughness of the steel strip. The purpose of annealing to eliminate strain aging is to maintain the plasticity and stability of the steel strip.

There are two traditional annealing treatment methods for low carbon steel strips. One is annealing the entire steel strip in a protective atmosphere bell furnace, and the annealing cycle of each furnace is 16-24 hours; the other is uncoiling annealing in a protective atmosphere continuous annealing furnace, and the operating time Short, but the steel strip has strain aging phenomenon after annealing. In addition, both annealing processes have the disadvantages of high energy consumption and low thermal efficiency.

In the 1970s, foreign research used the transverse magnetic field induction heating method to anneal cold-rolled low-carbon steel strips, which achieved certain results and was used in production practice. The following table gives the power supply conditions and annealing process parameters of some cold-rolled low-carbon steel strip transverse magnetic field induction heating production lines.

Steel strip transverse magnetic field induction heating power supply and annealing process parameters

The 200-320°C annealing treatment process listed in the table is mainly used to eliminate the strain aging phenomenon of thin steel strips. When the cold-rolled thin steel strip is subjected to rapid continuous annealing, the recrystallization annealing time from noon recovery is not sufficient, and the resulting annealed structure is not very stable. After being kept at room temperature, natural aging (i.e. strain) will occur under the action of its internal stress. aging) phenomenon. The occurrence of strain aging will reduce the plasticity of the steel strip and increase the brittleness. In severe cases, it will lead to brittle fracture of the steel strip. In order to reduce the strain aging phenomenon, a low-temperature annealing and rapid cooling method of 200-300°C is used.

This article briefly introduces the process parameters of transverse magnetic field induction heating annealing treatment of strips. I hope it can be helpful to your heat treatment work. If you want to know the specific induction heating annealing process, you can read more books on heat treatment or consult our technical staff.