The effect of mixed rare earth additions on inclusions in 18 MnCr petroleum casing steel

MENG Yuxiang; TIAN Jiazhi; ZHANG Yuling; DENG Xuyan; GAO Hui; TIAN Qingchao

doi:10.7513/j.issn.1004-7638.2025.03.020

Volume 46 Issue 3

Jun. 2025

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Article Navigation > IRON STEEL VANADIUM TITANIUM > 2025 > 46(3): 140-148

MENG Yuxiang, TIAN Jiazhi, ZHANG Yuling, DENG Xuyan, GAO Hui, TIAN Qingchao. The effect of mixed rare earth additions on inclusions in 18 MnCr petroleum casing steel[J]. IRON STEEL VANADIUM TITANIUM, 2025, 46(3): 140-148. doi: 10.7513/j.issn.1004-7638.2025.03.020

Citation:

MENG Yuxiang, TIAN Jiazhi, ZHANG Yuling, DENG Xuyan, GAO Hui, TIAN Qingchao. The effect of mixed rare earth additions on inclusions in 18 MnCr petroleum casing steel[J]. IRON STEEL VANADIUM TITANIUM, 2025, 46(3): 140-148. doi: 10.7513/j.issn.1004-7638.2025.03.020

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The effect of mixed rare earth additions on inclusions in 18 MnCr petroleum casing steel

doi: 10.7513/j.issn.1004-7638.2025.03.020

1.
Technology Center, Dalipu Petroleum Special Pipe Co., Ltd., Cangzhou 061113, Hebei, China
2.
Shanghai Research Institute of Materials, Shanghai 200434, China
3.
State Key Laboratory of Advanced Special Steel, Shanghai University, Shanghai 200444, China

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Received Date: 2024-07-06
Available Online: 2025-06-30
Publish Date: 2025-06-30

Abstract

Abstract

In order to study the changes of RE content during the process of steelmaking and continuous casting and the RE distribution in inclusions, 18MnCrRE steel was prepared by electric arc furnace melting. After ladle furnace refining and vacuum degassing (VD), mixed rare earth RE was added to the steel liquid followed by continuous casting of billets and hot rolling of pipes. The mass fraction and distribution of rare earth in the steel specimen during the experimental process were determined and analyzed by spectrograph, metallographic microscope and scanning electron microscope. Based on the research, it has found out that after adding rare earths, the attenuation characteristics of rare earth mass fraction in tundish is similar to that in VD furnace. The effect of rare earth on the inclusion nature and morphology is reflected by the enrichment of rare earth inclusions around the original inclusions that act as anchor point. During continuous casting, the rare earth inclusions in the steel are easy to be assembled and connected together. After hot rolling, rare earth inclusions exist in form of spherical particles, and rare earth oxide sulfides with good deformation performance achieve the encapsulation and modification of hard inclusions such as Al₂O₃.
- 18MnCr steel,
- rare earth,
- nozzle,
- continuous casting billet,
- inclusion modification

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References(29)

References

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