Formation Mechanism of Oxide-Sulfide Complex Inclusions in High-Sulfur-Containing Steel Melts

The [S] content in resulfurized steel is controlled in the range of 200 to 800 ppm to ensure good machinability and workability. It is well known that “MgAl 2 O 4 (spinel)+CaS” complex inclusions are formed in molten steel during the ladle refining process, and these cause nozzle clogging during con...

Full description

Saved in:
Bibliographic Details
Published in:Metallurgical and materials transactions. B, Process metallurgy and materials processing science Process metallurgy and materials processing science, 2018-02, Vol.49 (1), p.311-324
Main Authors: Shin, Jae Hong, Park, Joo Hyun
Format: Article
Language:English
Subjects:
ALUMINIUM OXIDES
Aluminum oxide
Calcium oxide
CALCIUM OXIDES
CALCIUM SULFIDES
Cams
CASTING
Characterization and Evaluation of Materials
Chemistry and Materials Science
Continuous casting
Electron microscopy
Machinability
MAGNESIUM OXIDES
MATERIALS SCIENCE
Melts
Metallic Materials
METALS
Multiphase
Nanotechnology
Nonmetallic inclusions
NOZZLES
PRECIPITATION
REFRACTORIES
Resulfurized steels
SCANNING ELECTRON MICROSCOPY
Silicon dioxide
SILICON OXIDES
SLAGS
SPECTROSCOPY
Spinel
SPINELS
STEELS
Structural Materials
SULFUR
Surfaces and Interfaces
Thin Films
Workability
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The [S] content in resulfurized steel is controlled in the range of 200 to 800 ppm to ensure good machinability and workability. It is well known that “MgAl 2 O 4 (spinel)+CaS” complex inclusions are formed in molten steel during the ladle refining process, and these cause nozzle clogging during continuous casting. Thus, in the present study, the “Refractory-Slag-Metal-Inclusions (ReSMI)” multiphase reaction model was employed in conjunction with experiments to investigate the influence of slag composition and [S] content in the steel on the formation of oxide-sulfide complex inclusions. The critical [S] and [Al] contents necessary for the precipitation of CaS in the CaO-Al 2 O 3 -MgO-SiO 2 (CAMS) oxide inclusions were predicted from the composition of the liquid inclusions, as observed by scanning electron microscopy–electron dispersive spectrometry (SEM-EDS) and calculated using the ReSMI multiphase reaction model. The critical [S] content increases with increasing content of SiO 2 in the slag at a given [Al] content. Formation mechanisms for spinel+CaS and spinel+MnS complex inclusions were also proposed.
ISSN:1073-5615
1543-1916
DOI:10.1007/s11663-017-1152-0