Thermodynamics of Molten MnS–CrS–FeS System at 1843 K

Yan, Linjuan; Miki, Tsuneharu

doi:10.2355/isijinternational.isijint-2020-741

ISIJ Int.

2021

DOI: 10.2355/isijinternational.isijint-2020-741

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Thermodynamics of Molten MnS–CrS–FeS System at 1843 K

Linjuan Yan

Tsuneharu Miki

Abstract: Phase equilibria in Fe-Cr-Mn-S quaternary system at 1 843 K were investigated experimentally. Two liquid phases: molten metal alloy phase and molten sulfide phase were in equilibrium in this system at 1 843 K. The equilibrium relations between molten metal alloy and sulfide phases were experimentally measured. By using metal/sulfide equilibrium method, activity of constituents in molten MnS-CrS-FeS sulfide phase were determined. By utilizing regular solution model, activity curves of constituents in sulfide ph… Show more

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Cited by 3 publications

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Toward an efficient recycling system: Evaluating recyclability of end‐of‐life stainless steels by considering elements distribution during a remelting process

Ohno

Takeda

et al. 2022

J of Industrial Ecology

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Stainless steel is a special category of steel and contains high chromium and nickel.With particular attention to chromium and nickel, the solvent metal phase of recycling of end-of-life (EoL) ferritic and austenitic stainless steels by remelting is considered Fe-Cr alloy and Fe-Cr-Ni alloy instead of pure iron, respectively. Understanding the element elimination behavior from the solvent metal phase during the remelting process is important for the improvement of the resource efficiency of the stainless steel recycling. The elimination behavior of 23 alloying elements from Fe-Cr alloy and 22 alloying elements from Fe-Cr-Ni alloy were quantitatively evaluated by the thermodynamic method. The conventional metallurgical process, including slagging (oxidation) and evaporation, can efficiently eliminate lots of alloying elements but has its limitation for the elimination of some alloying elements such as copper, antimony, and tin. Moreover, improvement of the elimination is hard to expect with optimizing remelting conditions. Developing novel metallurgical refining processes, such as chlorination and sulfurization, is efficient for eliminating specific alloying elements. However, besides the effort from metallurgical technologies, developing advanced physical separation technologies of collected EoL products in the short term and optimizing the alloy/products design principle in the long term are much more important for improving the resource efficiency of recycling of EoL stainless steel products. Feedback of the alloying elements' elimination behavior during the remelting process to the upstream of the stainless steel cycle is critical.

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Toward an efficient recycling system: Evaluating recyclability of end‐of‐life stainless steels by considering elements distribution during a remelting process

Ohno

Takeda

et al. 2022

J of Industrial Ecology

Self Cite

View full text Add to dashboard Cite

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Thermodynamics of Solid and Liquid MnS–CrS–FeS Phase in Equilibrium with Molten Fe–Cr–Mn–S Alloy

Yan

Miki

2021

ISIJ Int.

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Alloying elements such as Mn and Cr are widely used in steel. These two chemical elements have stronger affinity with sulfur than iron. 1) During cooling and solidification of steel, because of the decrease of sulfide solubility in steel and sulfur segregation, sulfide inclusions which consist of MnS-CrS-FeS may form in Fe-Cr-Mn-S based materials such as stainless steel. 2,3) It is very important to control the composition of MnS-CrS-FeS sulfide phase in terms of balancing properties of machinability and corrosion resistance [4][5][6][7][8] of the steel product.The mechanism of sulfide formation diagram was provided by Oikawa et al. 3) He suggested that there are three types of sulfide formation mechanism: 1). Stable eutectic reaction proceeds by nucleation of sulfide crystals by highmelting particles; 2). Metastable monotectic reaction; 3). Stable monotectic reaction which proceeds through the formation of low-melting sulfides. On knowing the different sulfide formation mechanisms, to control sulfide formation, it is fundamentally important to know the equilibria involving sulfide phase in the Fe-Cr-Mn-S system during solidification of steel. To create the equilibrium relationships, thermodynamic properties of both metal phase and sulfide phase are necessary to know.The thermodynamic information of liquid metal phase in Fe-Cr-Mn-S system, such as e

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Thermodynamics of Solid and Liquid MnS-CrS-FeS Phase in Equilibrium with Molten Fe-Cr-Mn-S Alloy

Yan

Miki

2022

Tetsu-to-Hagane

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Thermodynamics of Molten MnS–CrS–FeS System at 1843 K

Cited by 3 publications

References 8 publications

Toward an efficient recycling system: Evaluating recyclability of end‐of‐life stainless steels by considering elements distribution during a remelting process

Toward an efficient recycling system: Evaluating recyclability of end‐of‐life stainless steels by considering elements distribution during a remelting process

Thermodynamics of Solid and Liquid MnS–CrS–FeS Phase in Equilibrium with Molten Fe–Cr–Mn–S Alloy

Thermodynamics of Solid and Liquid MnS-CrS-FeS Phase in Equilibrium with Molten Fe-Cr-Mn-S Alloy

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