The influence of ingot segregation on quenching distortion of gear steel was investigated in this paper.The results show that the shape of ingot segregation of rod steel depends on the shape of continuous casting (CC) molds,and that the distortion of gear steel with square ingot segregation is uniform,while that of gear steel with rectangular ingot segregation is anisotropic.After quenching,the outer circle of the ring sample with a large rectangular segregation area is distorted into an oval shape.No obvious element segregation has been found in the rod steel produced through the rectangular CC mold.Obvious difference in density has been detected at the cross section of rod steel.It suggests that center porosity may be the main reason for the strong impact of segregation on heat treatment distortion of gear steel.
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