Forecasting the perspective compositions of duplex stainless steels

Kazakov, A. A.; Zhitenev, Andrey; Fedorov, A. S.; Fomina, O. V.

doi:10.17073/0368-0797-2020-3-4-254-260

Cited by 9 publications

(5 citation statements)

References 4 publications

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“…It should be noted that a similar approach has already been used in a previous paper, but only with the use of databases of thermodynamic data from SGTE [ 8 ]. Therefore, in this paper, these results were refined using more advanced thermodynamic databases.…”

Section: Resultsmentioning

confidence: 99%

“…The higher the PREN value, the more resistant the stainless steel is to localized pitting corrosion [ 3 ]. There are several empirical formulas to calculate the PREN (Equation (1) [ 4 , 5 , 6 , 7 ], Equation (2) [ 8 ], Equation (3) [ 3 , 4 , 7 ]): PREN = %Cr + 3.3(%Mo + 0.5%W) + 16%N; PREN = (%Cr − 14.5%C) + 3.3%Mo + 2%W + 2%Cu + 16%N; PREN = %Cr + 3.3%Mo + 16%N …”

Section: Introductionmentioning

confidence: 99%

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Development of a Methodology for the Quality Management of Duplex Stainless Steels

et al. 2022

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The use of traditional materials leads to failures and breakdowns of expensive equipment, so advanced materials are needed that can provide reliable and durable solutions. The ability to control the quality of duplex stainless steels (DSSs) can greatly help with the development of new compositions or choosing existing DSSs. In this case, it is necessary to consider the final consumer properties—corrosion resistance and mechanical properties, which depend on the phase composition, contamination with non-metallic inclusions (NMIs), and the presence of undesirable secondary phases. In this research, specimens of cast DSSs of different grades, produced at laboratory and industrial scales, were studied. A technique for quantifying the microstructure of DSSs was developed. A thermodynamic database was chosen that adequately describes the processes of phase formation in DSSs. The effects of heat treatment on the microstructure and corrosion properties of cast DSSs were studied. The effects of the structural state on the changes in consumer properties of the final product are shown. It is shown that using various deoxidation technologies, it is possible to obtain both NMIs that are dangerous in terms of corrosive activity and ones that are relatively safe.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Development of a Methodology for the Quality Management of Duplex Stainless Steels

et al. 2022

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“…In this study were investigated 21 wt.% Cr duplex steel as-cast and heat-treated ( Table 1). The experimental steel was performed in the open induction furnace [8]. The raw materials used were high-purity electrical steel, metallic chromium, metallic nickel, ferromanganese-95 and ferromolybdenum-60.…”

Section: Methodsmentioning

confidence: 99%

“…Already at 1210°C, an equal amount of austenite and δ-ferrite is achieved in this steel. With a subsequent decrease in temperature, the precipitation of chromium nitrides, σ-phase and chromium carbides is possible [8,9].…”

Section: Thermodynamic Modelingmentioning

confidence: 99%

Effect of heat treatment on the microstructure and corrosion properties of cast duplex stainless steels

2021

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The effect of the quenching temperature on the pitting corrosion resistance of lean duplex stainless steel (DSS) were examined. Using thermodynamic modeling of phase formation processes in steel during solidification and subsequent cooling was shown that the equal amount of austenite and ferrite is achieved at 1210°С for examined composition. Experimental steel samples were quenched from 1100 and 1200°С. It was found that as the temperature rises, the pitting potential increases significantly due to the achievement of a favorable phase ratio. The results of this experimental study made it possible to develop a heat treatment that provides high corrosion properties of lean DSS.

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“…Recently, in the oil and gas and chemical industries are increasingly being used products made of duplex stainless steels (DSSs), in which austenite and ferrite are in equal proportions [1][2][3][4]. Due to this phase ratio, these steels have high corrosion resistance along with enhanced mechanical properties [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Features of Crevice Corrosion of Different Grades of Duplex Stainless Steels

Fedorov

Karasev

Kovalev

2023

KEM

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Duplex stainless steels (DSSs) are being increasingly employed in the oil and gas and chemical industries, which, despite their high alloying degree and high resistance to general corrosion, are subject to pitting and crevice corrosion. According to their resistance to pitting and crevice corrosion, steels are ranked according to the PREN. However, nowadays there are many grades of DSSs, in which the content of Cr, Mo and N varies in different quantities, therefore the selection of the grade must be carried out with great care, considering not only PREN, but also the production technology, operating conditions, and the geometry of products. The crevice corrosion behaviors of three grades of duplex stainless steels quenched from 1050, 1100 and 1200 °C were studied in FeCl3 solution at 50°C. It is shown that PREN allows to rank only different grades in terms of corrosion resistance. With a constant PREN value, but with different contents of ferrite and austenite in steel, completely different values of the corrosion rate can be obtained, therefore, PREN must be used with great care. It was found that in the studied steels, the optimal ferrite content, at which the lowest crevice corrosion rate is achieved, is at 65 vol.%.

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Forecasting the perspective compositions of duplex stainless steels

Cited by 9 publications

References 4 publications

Development of a Methodology for the Quality Management of Duplex Stainless Steels

Development of a Methodology for the Quality Management of Duplex Stainless Steels

Effect of heat treatment on the microstructure and corrosion properties of cast duplex stainless steels

Features of Crevice Corrosion of Different Grades of Duplex Stainless Steels

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