The chemical composition of steel in every part is not completely consistent; the chemical composition of the phenomenon of uneven distribution is called segregation. Liquid steel in the process of solidification dissolved carbon in austenite and impurity elements in there was a significant difference on the diffusion velocity, when the steel in the austenite phase zone (such as rolling heating or roughing stage), carbon can give priority to achieve uniform, and non-metallic inclusion homogenization is difficult. Ferrite in priority by the dendritic segregation and nonmetallic inclusions formed in the extension of the strips, ferrite bands for austenite transformed into pearlite, between the two into a layered distribution is the banded structure. The presence of banded structure made of anisotropic materials Drama, tissue caused by uneven, when the deformation of steel, grain everywhere to bear and transmit the force of uneven, resulting in steel plastic index decrease. In addition from the center of the metallographic analysis result, the steel plate segregation is serious, the pearlite content on the high side, central area first reached the critical deformation in the process of stretching, produces the crack from then on, the formation of brittle fracture.
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