Hardenability of B containing spring steel 60Si2Mn and its CCT curves

doi:10.13251/j.issn.0254-6051.2022.12.023

Abstract

Abstract: End quenching test of spring steel 60Si2Mn with different B content (0.0005%-0.0047%) was carried out to study the effect of B on hardenability of the spring steel 60Si2Mn, and the theoretical calculation and experimental measurement of the CCT curves of 0.0026%B spring steel 60Si2Mn were carried out. The results show that the hardenability of the spring steel 60Si2Mn can be improved by adding B. When the B content is increased from 0.0005% to 0.0026%, the hardenability of the spring steel 60Si2Mn is significantly improved, but when the B content reaches 0.0047%, the hardenability is reduced compared with 0.0026%B content. The static CCT curves obtained by theoretical calculation show that the bainite transformation will occur during the cooling process after rolling at 300-400 ℃, which leads to higher hardness of the steel and affects the quality of rolled final products. The results of dynamic CCT curves show that when the cooling rate is less than 9 ℃/s, there are ferrite precipitation and pearlite transformation in the steel. When the cooling rate is greater than 10 ℃/s, there is only martensite transformation.

Key words: boron, spring steel 60Si2Mn, hardenability, CCT curves

CLC Number:

TG142.1

Lu Xinchun, Luo Yizheng, Wang Yanlin. Hardenability of B containing spring steel 60Si2Mn and its CCT curves[J]. Heat Treatment of Metals, 2022, 47(12): 132-137.

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