Next Article in Journal
Effect of Titanium Addition on As-Cast Structure and High-Temperature Tensile Property of 20Cr-8Ni Stainless Steel for Heavy Castings
Next Article in Special Issue
Effect of Heterogeneous Nucleation on Removal of Arsenic from Molten Steel by Rare Earth Addition
Previous Article in Journal
Effects of Thermomechanical Treatment on Phase Transformation of the Ti50Ni49W1 Shape Memory Alloy
Previous Article in Special Issue
Methods to Determine Characteristics of AOD-Converter Decarburization-Slags
Open AccessArticle

Revolution and Control of Fe-Al-(Mg, Ti)-O Oxide Inclusions in IF Steel during 260t BOF-RH-CC Process

1
The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China
2
Technical Center, HBIS Group Hansteel Company, Handan 056001, China
3
Research Institute of Technology, Shougang Group Co., Ltd., Beijing 100043, China
*
Authors to whom correspondence should be addressed.
Metals 2020, 10(4), 528; https://doi.org/10.3390/met10040528
Received: 1 April 2020 / Revised: 13 April 2020 / Accepted: 16 April 2020 / Published: 19 April 2020
(This article belongs to the Special Issue Inclusion/Precipitate Engineering in Steels)
The evolution of inclusions that contain Al, Mg, and Ti was studied through industrial-grade experiments. Field emission scanning electron microscopy, energy dispersive spectrometry, inductively coupled plasma atomic emission spectrometry, and FactSage software were used to analyze the evolution mechanisms of inclusions in Al-killed titanium alloyed interstitial free (IF) steel. The research found that the evolution of inclusions during the smelting process of IF steel is results in ‘large sphere-like SiO2-CaO-FeO-MgO-MnO’ and ‘small cluster spherical FeO-MnO’ change to cluster-like Al2O3 and irregular MgO·Al2O3, then change to Al2O3·TiOx and Al2O3, and finally change to Al2O3. It is difficult for Al2O3·TiOx to stably exist in the IF molten steel. It is the key to extend the holding time properly after Ruhrstahl Heraeus (RH) to ensure the removal of Al2O3 inclusion. With the increase of Mg content, the change path of MgAl2O4 inclusion in IF steel is that Al2O3 changes to MgO·Al2O3, and finally changes to MgO. It is difficult to suppress MgO·Al2O3 spinel formation by controlling the oxygen in the steel, but Ca can modify part of the MgO·Al2O3 spinel inclusions during RH refining. In order to ensure the removal of 6–10 μm inclusions, the holding time is suitable for 19–42 min. View Full-Text
Keywords: IF steel; inclusion evolution; thermodynamics; MgAl2O4 inclusion; Al2O3·TiOx IF steel; inclusion evolution; thermodynamics; MgAl2O4 inclusion; Al2O3·TiOx
Show Figures

Figure 1

MDPI and ACS Style

Cheng, R.; Li, R.; Cheng, D.; Liu, J.; Fang, Q.; Zhou, J.; Dong, W.; Zhang, H.; Ni, H. Revolution and Control of Fe-Al-(Mg, Ti)-O Oxide Inclusions in IF Steel during 260t BOF-RH-CC Process. Metals 2020, 10, 528.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Search more from Scilit
 
Search
Back to TopTop