Spherical annealing process for improving magnetic properties of low-carbon steel

doi:10.13251/j.issn.0254-6051.2022.04.030

Abstract

Abstract: Different annealing processes for improving the magnetic of low carbon steel was carried out. The results show that when the conventional complete annealing at 920 ℃ is replaced by spheroidizing annealing at 700 ℃, the magnetic properties are the same as those of the conventional annealing process, but the process time is only half of that of the conventional annealing. It is found that the morphology of cementite has a great influence on the magnetic properties. The lamellar cementite are broken and spheroidized during the spheroidizing annealing, which reduces the blocking effect on the magnetic circuit and improves the magnetic properties of the low carbon steel. The influence of spheroidization of tertiary cementite may be greater than that of eutectoid cementite.

Key words: mild steel, magnetic properties, complete annealing, spheroidizing annealing, cementite

CLC Number:

TG156.21

Zhang Jianjun, Zhuang Xiaowei, Tang Xiaofeng. Spherical annealing process for improving magnetic properties of low-carbon steel[J]. Heat Treatment of Metals, 2022, 47(4): 182-184.

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