Analysis of slag sticking layer and research on sticking mechanism of RH insertion tube

LI Fushen; ZHANG Min; YANG Peng; LIANG Xiaoping; BAI Xuxu; WANG Yu; WANG Tengfei

doi:10.7513/j.issn.1004-7638.2025.04.016

Volume 46 Issue 4

Aug. 2025

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LI Fushen, ZHANG Min, YANG Peng, LIANG Xiaoping, BAI Xuxu, WANG Yu, WANG Tengfei. Analysis of slag sticking layer and research on sticking mechanism of RH insertion tube[J]. IRON STEEL VANADIUM TITANIUM, 2025, 46(4): 119-126. doi: 10.7513/j.issn.1004-7638.2025.04.016

Citation:

LI Fushen, ZHANG Min, YANG Peng, LIANG Xiaoping, BAI Xuxu, WANG Yu, WANG Tengfei. Analysis of slag sticking layer and research on sticking mechanism of RH insertion tube[J]. IRON STEEL VANADIUM TITANIUM, 2025, 46(4): 119-126. doi: 10.7513/j.issn.1004-7638.2025.04.016

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Analysis of slag sticking layer and research on sticking mechanism of RH insertion tube

doi: 10.7513/j.issn.1004-7638.2025.04.016

1.
College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China
2.
Pangang Group Panzhihua Iron & Steel Research Institute Co., Ltd., Panzhihua 617000, Sichuan, China

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Received Date: 2024-12-06
Available Online: 2025-08-31
Publish Date: 2025-08-31

Abstract

Abstract

In order to address the problem of slag sticking on RH insertion tube during the RH refining process of heavy rail steel, on-site sampling was carried out for the adhered substances on the surface of the RH insertion tube, and the chemical composition and phase composition characteristics were analyzed. The mechanism of slag sticking on the RH insertion tube during the refining process of heavy rail steel was explored by combining with the interaction between the outer layer castable of the RH insertion tube and the slag, as well as thermodynamic analysis of the slag condensation and precipitation. The study shows that the adhered substances on the surface of the RH insertion tube are mainly composed of Al₂O₃, CaO, SiO₂ and MgO, and the formation of high-melting-point phases such as magnesium-aluminum spinel (MgO·Al₂O₃), magnesium-olivine (2MgO·SiO₂), and calcium aluminum-silicate (2CaO·Al₂O₃·SiO₂) is an important reason for the slag adhesion on the insertion tube. The slagging mechanism of the insertion tube can be described as follows: during the use of the insertion tube, due to the alternating temperature changes, the “viscous adhesion” and “precipitation adhesion” continuously occur on the surface of the slag, which makes the insertion tube slag layer thicken and difficult to fall off by itself, leading to the severe slagging of the RH insertion tube.
- RH insertion tube,
- bonding material,
- slagging mechanism

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References(26)

References

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