Effect of thermal deformation behavior on manganese sulfide inclusions in hot-rolled 20MnCr5 gear steel bars

WANG Xuhui; YANG Jian; ZHANG Qingsong; LI Wenhao; YIN Qing; WANG Weikun; ZHANG Mei

doi:10.7513/j.issn.1004-7638.2026.01.018

Volume 47 Issue 1

Feb. 2026

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WANG Xuhui, YANG Jian, ZHANG Qingsong, LI Wenhao, YIN Qing, WANG Weikun, ZHANG Mei. Effect of thermal deformation behavior on manganese sulfide inclusions in hot-rolled 20MnCr5 gear steel bars[J]. IRON STEEL VANADIUM TITANIUM, 2026, 47(1): 157-164. doi: 10.7513/j.issn.1004-7638.2026.01.018

Citation:

WANG Xuhui, YANG Jian, ZHANG Qingsong, LI Wenhao, YIN Qing, WANG Weikun, ZHANG Mei. Effect of thermal deformation behavior on manganese sulfide inclusions in hot-rolled 20MnCr5 gear steel bars[J]. IRON STEEL VANADIUM TITANIUM, 2026, 47(1): 157-164. doi: 10.7513/j.issn.1004-7638.2026.01.018

Citation:

WANG Xuhui, YANG Jian, ZHANG Qingsong, LI Wenhao, YIN Qing, WANG Weikun, ZHANG Mei. Effect of thermal deformation behavior on manganese sulfide inclusions in hot-rolled 20MnCr5 gear steel bars[J]. IRON STEEL VANADIUM TITANIUM, 2026, 47(1): 157-164. doi: 10.7513/j.issn.1004-7638.2026.01.018

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Effect of thermal deformation behavior on manganese sulfide inclusions in hot-rolled 20MnCr5 gear steel bars

doi: 10.7513/j.issn.1004-7638.2026.01.018

1.
State Key Laboratory of Advanced Special Steel (Shanghai University), school of Materials Science and Engineering, Shanghai University, Shanghai 200444, China
2.
Special Steel Research Institute, Jiangyin Xingcheng Special Steel, Jiangyin 214429, Jiangsu, China

More Information

Received Date: 2025-04-14
Accepted Date: 2025-05-08
Rev Recd Date: 2025-05-06

Available Online: 2026-02-25

Publish Date: 2026-02-25

Abstract

Abstract

The control of MnS inclusions is the key to the development of high-quality gear steel. In this paper, a Gleeble-3500 thermomechanical simulator was used to carry out single-pass hot compression experiments to investigate the hot deformation behavior of MnS inclusions in 20MnCr5 gear steel hot-rolled bars with a strain rate of 1.0 s^-1, deformation strains of 15%~50%, and deformation temperatures of 900~1100 ℃. At the same time, the effects of deformation ratio and deformation temperature on the size, aspect ratio morphology and relative plasticity of MnS and its composite inclusions were systematically studied. The results showed that the fragmentation degree of MnS inclusion changes periodically with deformation ratio and temperature. At 30% deformation ratio, with rising temperature, the relative plasticity of MnS inclusion first decreases from 2.31 to 2.01 and then increases to 3.55. At 950 ℃, with the increase in deformation, the relative plasticity continuously decreases from 2.98 to 2.01, and then to 0.94. Combined with the change in aspect ratio, size, and relative plasticity of MnS inclusions, the optimal deformation temperature of 20MnCr5 gear steel is 900 ℃ at 30% strain, and the optimal deformation ratio is 50% at 950 ℃.
- gear steel,
- manganese sulfide inclusions,
- deformation ratio,
- deformation temperature,
- relative plasticity

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References(26)

References

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