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Metals 2019, 9(2), 204; https://doi.org/10.3390/met9020204

Formation of Surface Depression during Continuous Casting of High-Al TRIP Steel

1
Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, Beijing 100083, China
2
Engineering Research Institute, University of Science and Technology Beijing, Beijing 100083, China
3
Shougang Technology Research Center, Shougang Corporation, Beijing 100043, China
4
Beijing Shougang Co. Ltd., Beijing 100043, China
*
Author to whom correspondence should be addressed.
Received: 31 December 2018 / Revised: 26 January 2019 / Accepted: 5 February 2019 / Published: 9 February 2019
(This article belongs to the Special Issue Ironmaking and Steelmaking)
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Abstract

High aluminum transformation-induced plasticity (TRIP) steels offer a unique combination of high tensile strength and ductility, high impact energy absorption and good formability. The surface of the slab is prone to depressions and longitudinal cracks during continuous casting due to the high Al content in steels. Surface depressions of the 1.35 wt.% Al-TRIP steel slab in a steel works were investigated by scanning electronic microscopy (SEM) and mold fluxes with different Al2O3/SiO2 ratios were researched by thermodynamic calculations and high-temperature static balance experiments. The results show that some micro-cracks were distributed along the grain boundary in the surface depression of the slab. Inclusions containing K and Na, which were probably from mold flux, were found in the depression samples. Meanwhile, the components of reactive mold flux showed significant variation in their chemical composition during the continuous casting process of the Al-TRIP steel. A large number of depressions and irregular oscillation marks on the Al-TRIP steel slab surface were generated due to serious deterioration in the physical properties of the mold flux. Since the TRIP steel is a typical hypo-peritectic steel, the overly large thermal contraction and volume contraction during initial solidification is the intrinsic cause of surface depression. The change of mold flux properties during casting aggravates the formation of depressions. View Full-Text
Keywords: Al-TRIP steel; surface depression; cracks; non-metallic inclusion; mold flux; reactivity Al-TRIP steel; surface depression; cracks; non-metallic inclusion; mold flux; reactivity
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Cui, H.; Zhang, K.; Wang, Z.; Chen, B.; Liu, B.; Qing, J.; Li, Z. Formation of Surface Depression during Continuous Casting of High-Al TRIP Steel. Metals 2019, 9, 204.

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