banded structures can generally be eliminated by heat treatment. For materials that can obtain single-phase structure at high temperature, banded structure can sometimes be eliminated by normalizing. The banded structure caused by severe phosphorus segregation must be improved by high temperature diffusion annealing and subsequent normalizing. The specific elimination methods are as follows:

1. Banded structure caused by composition segregation, that is, when steel contains harmful impurities such as phosphorus and is rolled, the impurities extend along the rolling direction. When the steel is cooled below Ar3, these impurities become the core of ferrite, which makes the ferrite shape distribute in a strip shape, and then pearlite also distributes in a strip shape. This banded structure can be eliminated by electroslag remelting and increasing crystallization speed.

2. For the banded structure caused by improper hot working temperature, that is, when the hot working stop forging temperature is in the two-phase zone (between Ar1 and Ar3), ferrite is banded out from austenite along the metal flow direction, and the undecomposed austenite is cut into banded structure. When cooled to Ar1, banded austenite is transformed into banded pearlite. This structure can be improved or eliminated by increasing the finishing temperature, forging ratio or diffusion annealing and normalizing.

3. It is difficult to eliminate the banded structure caused by composition segregation by heat treatment. Normally, normalizing can reduce this segregation to a certain extent, and normally, it can correct segregation to an allowable level. If the banded tissue is serious, it can be normalized several times to improve it. The most reliable method is high-temperature diffusion annealing first, and then normalizing again, which can achieve the effect of completely eliminating the banded structure, but the cost will be high, which is difficult to achieve for steel plates due to the limitation of surface quality.