Distribution of inclusions with different compositions in the unsteady ladel exchange slabs of automotive outer panel

GAO Jinqiao; YANG Zhishun; ZHANG Yinhui; YANG Jian; GONG Jian; HUANG Fuxiang; PEI Xingwei

doi:10.7513/j.issn.1004-7638.2026.02.015

Volume 47 Issue 2

Apr. 2026

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GAO Jinqiao, YANG Zhishun, ZHANG Yinhui, YANG Jian, GONG Jian, HUANG Fuxiang, PEI Xingwei. Distribution of inclusions with different compositions in the unsteady ladel exchange slabs of automotive outer panel[J]. IRON STEEL VANADIUM TITANIUM, 2026, 47(2): 132-142. doi: 10.7513/j.issn.1004-7638.2026.02.015

Citation:

GAO Jinqiao, YANG Zhishun, ZHANG Yinhui, YANG Jian, GONG Jian, HUANG Fuxiang, PEI Xingwei. Distribution of inclusions with different compositions in the unsteady ladel exchange slabs of automotive outer panel[J]. IRON STEEL VANADIUM TITANIUM, 2026, 47(2): 132-142. doi: 10.7513/j.issn.1004-7638.2026.02.015

Citation:

GAO Jinqiao, YANG Zhishun, ZHANG Yinhui, YANG Jian, GONG Jian, HUANG Fuxiang, PEI Xingwei. Distribution of inclusions with different compositions in the unsteady ladel exchange slabs of automotive outer panel[J]. IRON STEEL VANADIUM TITANIUM, 2026, 47(2): 132-142. doi: 10.7513/j.issn.1004-7638.2026.02.015

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Distribution of inclusions with different compositions in the unsteady ladel exchange slabs of automotive outer panel

doi: 10.7513/j.issn.1004-7638.2026.02.015

1.
State Key Laboratory of Advanced Special Steel, School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China
2.
School of chemistry science and engineering, Yunnan university, Kunming 650091, Yunnan, China
3.
Shougang Qian'an Iron and Steel Co., Ltd. , Tangshan 064404, Hebei, China

More Information

Received Date: 2025-04-21
Accepted Date: 2025-05-16
Rev Recd Date: 2025-05-13

Available Online: 2026-04-29

Publish Date: 2026-04-29

Abstract

Abstract

In the present work, a statistical analysis of micro-inclusions and large-size inclusions was conducted in 31-meter-long unsteady ladel exchange slabs of two heats (A and B) of IF steel for automotive outer panels, combined with thermodynamic calculation of inclusion precipitation during the solidification process of continuous casting slabs using FactSage 8.1. Analytical results demonstrate that the main micro-inclusions larger than 5 μm are identified as Al₂O₃ inclusions, TiN inclusions and Al₂O₃+TiN composite inclusions, respectively. Typical large-size inclusions above 30 μm extracted in the ladel exchange slabs extracted by the large-sample electrolysis mainly include blocky and clustered Al₂O₃ inclusions of 100-200 μm, entrapped irregular mold flux particles of approximately 800 μm, SiO₂+Al₂O₃ inclusions with the sizes of 100-300 μm, and spherical calcium aluminate inclusions with the sizes of 30-100 μm. During the pouring of B furnace, there is a significant increase in the contents of four types of large inclusions in the transition slabs at 3 m before and 14 m after the start of pouring, and the contents of inclusions in larger size ranges increase more significantly. The average contents of SiO₂+Al₂O₃ inclusions, Al₂O₃ inclusions, entrapped mold flux and CaO+Al₂O₃ inclusions in the transition slabs are 13, 3, 3.5 and 7 times those in the normal slabs, respectively.
- ladel exchange slabs,
- contents of large-size inclusions,
- compositions of large-size inclusions,
- ladle exchange,
- automotive outer panel

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References(37)

References

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