Effect of continuous annealing slow cooling outlet temperature on yield strength of SPCC cold rolled sheet

doi:10.13251/j.issn.0254-6051.2020.02.025

Abstract

Abstract:

Effect of continuous annealing slow cooling outlet temprature on microstructures and yield strength of SPCC cold rolled sheet was studied. The results show that the microstructure of the continuous annealed SPCC cold rolled sheet mainly consists of equiaxed ferrite grains, massive cementites on grain boundaries and spheroidite cementites in grains. With the increase of slow cooling outlet temprature from 680 ℃ to 700 ℃, the average grain size increases from 10.1 μm to 12.5 μm. In addition, increasing the slow cooling outlet temprature can promote the precipitation of fine cementites in grains by inhibiting the formation of massive cementites on grain boundaries. When the slow cooling outlet temprature increases from 680 ℃ to 700 ℃, the yield strength of the continuous annealed SPCC cold rolled sheet decreases by about 28 MPa.

Key words: continuous annealing, slow cooling outlet temprature, SPCC cold rolled sheet, microstructure, yield strength

CLC Number:

TG142.1

Zhou Bowen, Jiang Cailing, Fan Lei, Zhou Hua, Gao Yuan, Li Yu'nan, Ye Jiang. Effect of continuous annealing slow cooling outlet temperature on yield strength of SPCC cold rolled sheet[J]. HTM, 2020, 45(2): 129-133.

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