Effect of cooling rate on microstructure and mechanical properties of Cr5 steel for backup roll

doi:10.13251/j.issn.0254-6051.2022.06.012

Abstract

Abstract: Effect of cooling rate on microstructure and mechanical properties of Cr5 steel for backup roll was investigated by means of optical microscopy, Vickers hardness tester, tensile tester and Charpy pendulum impact tester. The results show that with the decrease of cooling rate, the pearlite content increases, the strength and hardness increase, the plasticity and toughness are similar. As the cooling rate reaches above 3 ℃/min, the volume fraction of pearlite in the microstructure is less than 30%, tensile strength ≥1025 MPa, yield strength ≥750 MPa, hardness ≥45 HS, impact absorbed energy ≥40 J. Production test result shows that heat treatment with strong air cooling can make the mechanical properties of the roll neck surface to a certain depth reach the effect of oil cooling, which fully meets the mechanical properties of the backup roll neck.

Key words: Cr5 steel for backup roll, cooling rate, microstructure, mechanical properties

CLC Number:

TG15

Bai Xinghong, Zhao Xichun, Zhao Deli, Wang Dapeng, Nan Yujing. Effect of cooling rate on microstructure and mechanical properties of Cr5 steel for backup roll[J]. Heat Treatment of Metals, 2022, 47(6): 69-71.

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