Metallurgy, Vol. 65 No. 4, 2026.
Original scientific paper
https://doi.org/https://doi.org/10.64486/m.65.4.1
Effect of Cooling Rate on the Precipitation Behavior of MnS Inclusions in 46MnVS5 Non-Quenched and Tempered Steel
H.K. Sun
; Metallurgy and Energy College, North China University of Science and Technology, Tangshan, China
Y.H. Li
; Key Laboratory of lntelligent Equipment Digital Design and Process Simulation, Tangshan University, Tangshan, China
P. J. Li
; HBIS Group Shisteel Company, Shijiazhuang, China
S.H. Wang
; Metallurgy and Energy College, North China University of Science and Technology, Tangshan, China
B. X. Lu
; Tangshan Iron and Steel Group Co., Ltd. Technology Research and Development Center, Tangshan, China
Y.K. Xue
; Metallurgy and Energy College, North China University of Science and Technology, Tangshan, China
*
* Corresponding author.
Abstract
This study systematically investigated the effects of cooling rates on the morphol-ogy, size, distribution, and microstructural properties of MnS inclusions in 46MnVS5 non-quenched and tempered steel through three cooling methods: water quenching, air quenching, and furnace cooling. Results indicate that cooling rate significantly regulates MnS precipitation behavior: under furnace cooling, MnS forms coarse particles that aggregate along grain boundaries, leading to reduced properties; air cooling produced spherical or short rod-shaped MnS with uniform distribution and optimal comprehensive properties; water cooling resulted in fine, dispersed MnS with a martensite/bainite microstructure, enhancing toughness but requiring tempering treatment. A nonlinear relationship between cooling rate and average MnS diameter was established, providing theoretical support for opti-mizing air cooling processes.
Keywords
non quenched and tempered steel; cooling rate; MnS inclusions; microstructure
Hrčak ID:
347928
URI
Publication date:
1.10.2026.
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