Cause analysis and prevention of edge cracks in cold-rolled 65Mn wide steel strip

doi:10.13251/j.issn.0254-6051.2021.05.046

Abstract

Abstract: Causes of edge cracks in cold-rolled 65Mn wide steel strip were studied by metallographic observation and hardness test. The results show that the microstructure of the hot-rolled steel strip is ferrite and pearlite, the pearlitic structure in the edge region is relatively thinner than that in the middle region due to faster water-cooling rate. During the intercritical spheroidizing annealing process, these finer pearlites become brittle coarse pearlite more easily, and under the condition of relatively large cold rolling reduction, the edge cracks appear. By substituting the intercritical spheroidizing annealing to subcritical spheroidizing annealing, the microstructure spheroidization rate at the edge of the 65Mn steel strip is significantly increased, and basically avoiding the occurrence of edge cracks, so that providing positive guidance for the industrial production.

Key words: 65Mn steel, cold rolling, edge crack, spheroidizing annealing

CLC Number:

TG142.1

Jin Yajun, Wang Chuang, Dou Xiaoyao, Huang Aijun, Huang Yongheng. Cause analysis and prevention of edge cracks in cold-rolled 65Mn wide steel strip[J]. Heat Treatment of Metals, 2021, 46(5): 262-266.

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