• Precipitation of sigma phase in duplex stainless steel and …

    The temperature-time precipitation kinetic of secondary phases in DSS is summarized. ... (SAF2205; standard) and S32750 (SAF2507; super) in UNS standard are attracting much attention. Table 1. Classification of DSS from JIS / UNS standard and ... Development of tungsten-bearing super duplex stainless steel "DP3W" for flowlines. …

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  • Double Kinetics of Intermetallic Phase Precipitation in …

    cold rolled UNS S32205 duplex stainless steel were submitted to isothermal heat treatments at 850 o C during 10, 15, 30, 60, 120, 180, 240, and 300 minutes in order to study the precipitation kinetics

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  • Effect of Aging Temperature on the Microstructure, Local …

    In this paper, the effect of aging temperature on the microstructure, local mechanical properties and wear behavior of a UNS S32750 super duplex stainless steel is investigated. A massive preferential precipitation of σ phase and Cr2N is detected at the periphery of ferrite with an increase in their extent as aging temperature increases. …

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  • Double Kinetics of Intermetallic Phase Precipitation in …

    Eight samples of as-received cold rolled UNS S32205 duplex stainless steel were submitted to isothermal heat treatments at 850 oC during 10, 15, 30, 60, 120, 180, 240, and 300 …

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  • (PDF) Kinetics of the UNS S32750 Super Duplex Stainless …

    PDF | On Mar 30, 2022, J. F. V. Lima and others published Kinetics of the UNS S32750 Super Duplex Stainless Steel Low-Temperature Plasma Nitriding | Find, …

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  • Desenvolvimento do aço inoxidável super-duplex UNS …

    and kinetics of such complex stainless steels is a pre-condition to understand ... Chemical composition of super-duplex stainless steel UNS 32760-ASTM A276 standard (4501)), the pilot scale heats ...

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  • Kinetics of Sigma Phase Formation In a Duplex Stainless …

    This work determines the kinetics of sigma phase formation in UNS S31803 Duplex Stainless Steel (DSS), describing the phase transformations that occur in isothermal …

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  • Growth kinetics of secondary austenite in the welding microstructure …

    A thermodynamic and kinetic assessment was made of secondary austenite (γ2) growth in the welding microstructure of a UNS S32304 duplex stainless steel during reheat cycles, between 900 and 1250°C.

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  • Bulletin High Alloy Stainless Steels for Fisher Valves

    S31803 Duplex CD3MN Duplex 35 35 30 (3)85 150 300(3) S32760 Super Duplex CD3MWCuN Super Duplex 44 44 70 (3)160(3) 250+(3) 480+ S31254 Super Austenitic CK3MCuN Super Austenitic 43 45 70(3) 160(3) 250+(2,3) 480+(2,3) 1. NACE Corrosion 94 Conference Paper by R. Francis, The Performance of Duplex Stainless Steels in …

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  • Magnetic properties of the UNS S39205 duplex stainless …

    The magnetic properties of a duplex stainless steel UNS S39205 can be strongly modified changing the ferrite/austenite proportions. The magnetization saturation (m s) can be used to obtain the ferrite volume fraction (C α) by the expression C α =m s (Am 2 /kg)/133, where 133 Am 2 /kg is the intrinsic m s value of the ferrite phase.

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  • Double Kinetics of Intermetallic Phase Precipitation in …

    kinetics and synergetic behaviors of the chi and sigma phases present in UNS S32205 duplex stainless steel following isothermal treatments. A final annealing was performed after the manufacturing steps, but the rolling structure nonetheless altered the intermetallic kinetics, as found here when the steel was submitted to isothermal treatments. As

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  • (PDF) Duplex Stainless Steels—Alloys for the 21st Century

    The paper shows how duplex stainless steels can provide cost-effective solutions in corrosive environments, and why they will be a standard corrosion resistant alloy (CRA) for many industries ...

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  • HYPER-DUPLEX STAINLESS STEELS

    16 17 18 19 THE CHALLENGE As the oil and gas industry moves further ofshore into deeper waters, the need for stronger, lighter and more corrosion-resistant materials is …

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  • (PDF) Effect of ageing time on the toughness and the …

    The procedure chosen is based on a comparison of the corrosion properties between a duplex steel, SAF 2205 (UNS S31803) and two special alloys having compositions similar to the α- and γ-phases ...

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  • On the Precipitation of Sigma and Chi Phases in a Cast Super Duplex …

    Super duplex stainless steels are prone to the formation of undesirable secondary phases, particularly when exposed to slow cooling rates. In the current study, the mechanisms of formation of secondary phases have been characterized using a combination of optical microscopy, scanning electron microscopy, and transmission …

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  • (PDF) Super duplex stainless steels

    This paper presents an overview of duplex stainless steels (DSS) with particular emphasis on super DSS, i.e. steels containing sufficient amounts of chromium, molybdenum, and nitrogen to...

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  • (PDF) Investigation of Stress Corrosion Cracking of Austenitic, Duplex

    Stress corrosion cracking (SCC) of UNS S31603 austenitic (ASS), UNS S32205 duplex (DSS) and UNS S32750 super duplex (SDSS) was investigated. SCC tests were carried out at 110 ºC for 500 h under ...

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  • (PDF) Effects of Copper on Precipitation of Secondary Phases in Duplex

    Copper significantly slowed down the kinetics at the expense of Cu-rich particle precipitation, where the high-copper material subjected to hot isostatic pressing (HIP), with Δ t 500–400 of 160 ...

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  • (PDF) Double Kinetics of Intermetallic Phase Precipitation in UNS

    An aging treatment of UNS S32750 super duplex stainless steel at 1173 K for 1.0 ks produced σ and secondary austenite (γ2) phases in the α and γ phase boundary regions.

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  • Kinetics of Sigma Phase Formation In a Duplex …

    This work determines the kinetics of sigma phase formation in UNS S31803 Duplex Stainless Steel (DSS), describing the phase transformations that occur in isothermal aging between 700 and 900 °C for time periods up to 1032 hours, allowing the determination of the Time-Temperature-Precipitation (TTP) diagram for sigma phase

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  • (PDF) Super duplex stainless steels

    Abstract and Figures. This paper presents an overview of duplex stainless steels (DSS) with particular emphasis on super DSS, i.e. steels containing sufficient amounts of chromium, molybdenum, and ...

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  • (PDF) Duplex and Superduplex Stainless Steels: …

    PDF | The paper presents an overview of diffusion surface treatments, especially nitriding processes, applied to duplex and superduplex stainless steels... | Find, read and cite all the research ...

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  • Experimental and numerical multiscale characterization of a super …

    Duplex stainless steels (DSS) and Super duplex stainless steels (SDSS) have been widely used in corrosive environments, such as offshore, oil or chemical industries, due to their favourable combination of pitting corrosion resistance and mechanical properties. Microstructure plays a fundamental role in regard to the desired …

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  • (PDF) A Study on Precipitation Kinetics of Super Duplex …

    In this work, the effect of long-term isothermal heat treatment on the kinetics of sigma phase precipitation of super duplex steels is qualitatively and quantitatively examined in detail ...

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  • Duplex 2507 Stainless Steel

    Duplex 2507 (UNS S32750) is a super duplex stainless steel with 25% chromium, 4% molybdenum, and 7% nickel designed for demanding applications which require exceptional strength and corrosion resistance, such as chemical process, petrochemical, and seawater equipment. The steel has excellent resistance to chloride stress corrosion cracking ...

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  • The role of tungsten on the phase transformation kinetics …

    This investigation demonstrated 2.1 wt% tungsten drastically reduced the kinetics of tertiary phase precipitation in 25Cr super duplex stainless steels. The slow kinetics resulted in a better overall pitting corrosion resistance. ... UNS S32750 (W-free used as reference), UNS S32760 (0.6 wt.% W), and UNS S39274 (2.1 wt.% W) that were ...

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  • Mechanical Properties for Circumferential Welding Applied to UNS …

    Super Duplex Stainless Steel has been studied for oil and gas industry applications since the 90 s, but their welding always is a technical issue. Then different methods were developed to meet all requirements presents in ASME standards, where most of are applied for lower production, when compared to other materials such carbon steel. This study …

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  • (PDF) Influência das transformações de fases nas …

    Influência das transformações de fases nas propriedades mecânicas de um aço inoxidável duplex UNS S31803 (SAF 2205) envelhecido isotermicamente a 750ºC e a 850ºC February 2019 DOI: 10. ...

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  • SciELO

    So, this work reports an experimental investigation on the thermodynamic and kinetic view-point of the nitrided layer growth behavior, carried out separately at the ferrite and austenite phase grains for the UNS S32750 super duplex stainless steel (SDSS), as a function of the nitriding temperature and time. 2. Experimental Procedure

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  • Effect of annealing temperature on the pitting corrosion resistance of

    The pitting corrosion resistance of commercial super duplex stainless steels SAF2507 (UNS S32750) annealed at seven different temperatures ranging from 1030 °C to 1200 °C for 2 h has been ...

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  • Phase Transformations in Duplex Stainless Steel: …

    Duplex stainless steels (commonly known as DSS) are a class of stainless steels with a microstructure formed by two main phases: ferrite and austenite. They are used in a wide range of applications, such …

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  • Duplex Stainless Steels: Effect of Reversion Heat Treatment

    Duplex stainless steels present good corrosion resistant and mechanical properties hence they are being used in various pressure boundary components of nuclear power plants such as primary coolant pipes, valves and pump bodies because of the presence of the dual microstructure which consists of equal amounts of austenite and α …

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  • (PDF) Kinetics of Sigma Phase Formation In a Duplex Stainless …

    This work determines the kinetics of sigma phase formation in UNS S31803 Duplex Stainless Steel (DSS), describing the phase transformations that occur in isothermal aging between 700 and 900 °C ...

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  • CHARACTERIZATION OF CHROMIUM NITRIDE PRECIPITATION …

    A thermodynamic and kinetic assessment was made of secondary austenite (γ2) growth in the welding microstructure of a UNS S32304 duplex stainless steel during reheat cycles, between 900 and 1250°C.

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