The hardness of round steel is relatively high. Some round steel is difficult to cut when cutting, which easily causes the edge of the shearing tool to crack. After the sheared bar is placed for a period of time (more than 12 hours), a through crack appears on the end face, indicating that there is a large residual stress in the bar after shearing. Stress cracking, which includes temperature stress, structural stress and deformation stress. End cracking is generally the result of the combined action of various stresses, but one of the factors is the main reason and plays a dominant role, and shearing is the direct cause or inducement.

In the case of insufficient heating, 20CrMnTi(H) has serious segregation in the microstructure, resulting in the formation of martensite and bainite in the segregation zone. When the round steel is sheared at low temperatures, the huge shear stress and shear deformation cause microcracks in the martensite and bainite in the segregation zone.

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