Decarburization of molten stainless steel by slag containing Cr 2O3

Yong Ik Jang; Ho Sang Sohn; Yong Hwan Kim; Young Jo Kang

doi:10.3365/KJMM.2014.52.7.519

Decarburization of molten stainless steel by slag containing Cr ₂O₃

Yong Ik Jang, Ho Sang Sohn, Yong Hwan Kim, Young Jo Kang

Research output: Contribution to journal › Article › peer-review

Abstract

During refining of stainless-steel melt using the AOD (Argon Oxygen Decarburization) process, slag composition and melt stirring can significantly affect the decarburization behavior and reduction of Cr₂O₃ in slag. An 18 wt%Cr-8 wt%Ni stainless-steel melt containing 0.2 wt%C was decarburized at 1650 °C by different types of slag containing Cr ₂O₃. Melt stirring by Ar or Ar+O₂ gas bubbling through a submerged nozzle enhanced the decarburization rate significantly. Pure solid Cr₂O₃ and liquid slag containing Cr ₂O₃ were far more effective than a solid CaO-Cr ₂O₃ mixture for decarburization. The formation of a stable CaO-Cr₂O₃ phase in the slag was confirmed by XRD analysis after the decarburization experiment with CaO-Cr₂O₃ slag. Therefore, in order to improve the decarburization of stainless-steel melt in low-carbon-content regions, it is essential to increase the liquid fraction of slag.

Original language	English
Pages (from-to)	519-525
Number of pages	7
Journal	Journal of Korean Institute of Metals and Materials
Volume	52
Issue number	7
DOIs	https://doi.org/10.3365/KJMM.2014.52.7.519
State	Published - Jun 2014

Keywords

Calcium chromite
Decarburization
Slag
Stainless steel

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10.3365/KJMM.2014.52.7.519

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title = "Decarburization of molten stainless steel by slag containing Cr 2O3",

abstract = "During refining of stainless-steel melt using the AOD (Argon Oxygen Decarburization) process, slag composition and melt stirring can significantly affect the decarburization behavior and reduction of Cr2O3 in slag. An 18 wt%Cr-8 wt%Ni stainless-steel melt containing 0.2 wt%C was decarburized at 1650 °C by different types of slag containing Cr 2O3. Melt stirring by Ar or Ar+O2 gas bubbling through a submerged nozzle enhanced the decarburization rate significantly. Pure solid Cr2O3 and liquid slag containing Cr 2O3 were far more effective than a solid CaO-Cr 2O3 mixture for decarburization. The formation of a stable CaO-Cr2O3 phase in the slag was confirmed by XRD analysis after the decarburization experiment with CaO-Cr2O3 slag. Therefore, in order to improve the decarburization of stainless-steel melt in low-carbon-content regions, it is essential to increase the liquid fraction of slag.",

keywords = "Calcium chromite, Decarburization, Slag, Stainless steel",

author = "Jang, {Yong Ik} and Sohn, {Ho Sang} and Kim, {Yong Hwan} and Kang, {Young Jo}",

year = "2014",

month = jun,

doi = "10.3365/KJMM.2014.52.7.519",

language = "English",

volume = "52",

pages = "519--525",

journal = "Journal of Korean Institute of Metals and Materials",

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T1 - Decarburization of molten stainless steel by slag containing Cr 2O3

AU - Jang, Yong Ik

AU - Sohn, Ho Sang

AU - Kim, Yong Hwan

AU - Kang, Young Jo

PY - 2014/6

Y1 - 2014/6

N2 - During refining of stainless-steel melt using the AOD (Argon Oxygen Decarburization) process, slag composition and melt stirring can significantly affect the decarburization behavior and reduction of Cr2O3 in slag. An 18 wt%Cr-8 wt%Ni stainless-steel melt containing 0.2 wt%C was decarburized at 1650 °C by different types of slag containing Cr 2O3. Melt stirring by Ar or Ar+O2 gas bubbling through a submerged nozzle enhanced the decarburization rate significantly. Pure solid Cr2O3 and liquid slag containing Cr 2O3 were far more effective than a solid CaO-Cr 2O3 mixture for decarburization. The formation of a stable CaO-Cr2O3 phase in the slag was confirmed by XRD analysis after the decarburization experiment with CaO-Cr2O3 slag. Therefore, in order to improve the decarburization of stainless-steel melt in low-carbon-content regions, it is essential to increase the liquid fraction of slag.

AB - During refining of stainless-steel melt using the AOD (Argon Oxygen Decarburization) process, slag composition and melt stirring can significantly affect the decarburization behavior and reduction of Cr2O3 in slag. An 18 wt%Cr-8 wt%Ni stainless-steel melt containing 0.2 wt%C was decarburized at 1650 °C by different types of slag containing Cr 2O3. Melt stirring by Ar or Ar+O2 gas bubbling through a submerged nozzle enhanced the decarburization rate significantly. Pure solid Cr2O3 and liquid slag containing Cr 2O3 were far more effective than a solid CaO-Cr 2O3 mixture for decarburization. The formation of a stable CaO-Cr2O3 phase in the slag was confirmed by XRD analysis after the decarburization experiment with CaO-Cr2O3 slag. Therefore, in order to improve the decarburization of stainless-steel melt in low-carbon-content regions, it is essential to increase the liquid fraction of slag.

KW - Calcium chromite

KW - Decarburization

KW - Slag

KW - Stainless steel

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JO - Journal of Korean Institute of Metals and Materials

JF - Journal of Korean Institute of Metals and Materials

IS - 7

ER -

Decarburization of molten stainless steel by slag containing Cr ₂O₃

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