Premature failure of superduplex stainless steel pipe by pitting in sea water environment

Smiderle, Juliana Jerônimo; Pardal, Juan Manuel; Tavares, Sérgio Souto Maior; Vidal, Ana Cristina

doi:10.1016/j.engfailanal.2014.08.001

Cited by 20 publications

(6 citation statements)

References 14 publications

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“…Pettersson et al [14] studied the chromium nitride precipitation of UNS S32750 at different cooling rates. The pitting corrosion resistance of SDSS weld metal was closely correlated with precipitation during thermal treatments, such as heat treatment at various temperatures or welding [15,16]. A Cr depletion zone was reported at the Cr 2 N boundary [17,18], and the quantity of Cr 2 N in high-Mn DSS increased with high alloying, inducing corrosion resistance deterioration [19].…”

Section: Introductionmentioning

confidence: 95%

Effect of Dynamic Reheating Induced by Weaving on the Microstructure of GTAW Weld Metal of 25% Cr Super Duplex Stainless Steel Weld Metal

Sung

Kang

2017

Metals

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The importance of the additional growth and/or transformation of the austenite phase that occurs in weld metals of super duplex stainless steel upon reheating is known. However, the effects have not been fully investigated, especially with respect to reheating induced by weaving during single-pass welding. In this work, bead-on-pipe gas tungsten arc welding (GTAW) was conducted on super duplex stainless steel to understand the effect of weaving on the microstructure of weld metal. Microstructural analysis, electron backscatter diffraction (EBSD), and focused ion beam transmission electron microscopy (FIB-TEM) were carried out to investigate the relationship between weaving and microstructural change. The weaving of GTAW produced a dynamic reheated area just before the weld bead during welding. It was revealed that extensive reheated weld existed even after one welding pass, and that the content of the austenite phase in the reheated area was higher than that in the non-reheated area, indicating the existence of a large quantity of intragranular austenite phase. In addition, the Cr 2 N content in the reheated area was lower than that in the non-reheated area. This reduction of Cr 2 N was closely related to the reheating resulting from weaving. TEM analysis revealed that Cr 2 N in the non-reheated area was dispersed following heating and transformed to secondary austenite.

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Section: Introductionmentioning

confidence: 95%

Effect of Dynamic Reheating Induced by Weaving on the Microstructure of GTAW Weld Metal of 25% Cr Super Duplex Stainless Steel Weld Metal

Sung

Kang

2017

Metals

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“…5 In particular, chloride-induced localized corrosive failure, such as pitting and crevice corrosion, limits the applicability of the material and unpredicted and premature failure of stainless steel engineering components is frequently observed in chloride containing media. [6][7][8][9][10] The localized corrosive failure is often concealed by the component geometry (e.g. in crevices) or hidden in form of large subsurface pits with a small pit mouth 5,10 and thus the corrosion-site often remains undetected until component failure.…”

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confidence: 99%

Interfacial Interaction of Oxidatively Cured Hydrogen Silsesquioxane Spin-On-Glass Enamel with Stainless Steel Substrate

Lampert

Kadkhodazadeh

Jensen³

et al. 2017

J. Electrochem. Soc.

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Thin film silica coatings have proven to be efficient barrier coatings to protect stainless steels from corrosion in aggressive environments. The deposition of sub-μm silica films from liquid hydrogen silsesquioxane precursor has previously been demonstrated on metallic substrates, whereby the films were thermally cured in inert atmosphere, which required complicated processing equipment, such as gas or vacuum furnaces. In contrast, curing in air is a promising routine to simplify the curing process, reduce curing cost and increase the curing efficiency. In the present work, silica-like thin films were deposited on 316L grade austenitic stainless steel and oxidatively cured at 450 • C in ambient air. Oxidative curing yielded well adherent films which solely showed microscopic delamination after standardized adherence testing. Further, the oxidative curing led to the formation of a pronounced interfacial duplex-oxide with an outer zone composed of Fe 2 O 3 in a SiO 2-x matrix and an inner zone composed of complex (Cr 3+ ,Fe 2+ ,Mn 2+ )-oxides. Moreover, a Cr depletion of the substrate in the immediate vicinity of the surface was observed. It was concluded that the interfacial formation is controlled by the kinetic limitation of Cr transport to the interface, which consequently led to the Cr-depletion of the sub-surface region.

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“…1 They are considered suitable for application in marine environments such as desalination systems and modern oil and gas offshore platforms. 2,3 Corrosion tests of stainless steels in seawater are always conducted in natural or simulated seawater. 4,5 However, some local environments formed around the steel can cause deterioration of the corrosion property and threaten safe operation of ocean equipment constructed with SDSS.…”

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confidence: 99%

Passivation Behavior and Surface Chemistry of 2507 Super Duplex Stainless Steel in Acidified Artificial Seawater Containing Thiosulfate

Cui

Chen

Wang

et al. 2017

J. Electrochem. Soc.

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In this work, passivation behavior and surface chemistry of 2507 super duplex stainless steel (SDSS) in acidified artificial seawater (ASW) containing different concentrations of thiosulfate are investigated using electrochemical techniques, X-ray photoelectron spectroscopy and the Point Defect Model. The 2507 SDSS is resistant to thiosulfate-induced pitting corrosion in the acidified ASW with a] ratio ranging from 59 to 5900, while the film dissolution rate is enhanced, resulting in a higher passive current density and lower polarization resistance. The passive film exhibits n-type semiconductivity in the acidified ASW and is independent of the thiosulfate levels. The donor density shows little change while the point defect diffusivity increases with increasing thiosulfate concentration. No elemental sulfur and sulfur-containing compounds can be detected on the well-passivated surface of 2507 SDSS, but increasing thiosulfate concentration results in the depletion of Cr 2 O 3 , enrichment of oxidized Fe, and thinning of the passive film. The influence of thiosulfate on the film composition depends on the passive states. Thiosulfate promotes the formation of Fe(II) in the prepassive region and accelerates the transformation of Cr(III) to Cr(VI) in the transpassive region.

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Premature failure of superduplex stainless steel pipe by pitting in sea water environment

Cited by 20 publications

References 14 publications

Effect of Dynamic Reheating Induced by Weaving on the Microstructure of GTAW Weld Metal of 25% Cr Super Duplex Stainless Steel Weld Metal

Effect of Dynamic Reheating Induced by Weaving on the Microstructure of GTAW Weld Metal of 25% Cr Super Duplex Stainless Steel Weld Metal

Interfacial Interaction of Oxidatively Cured Hydrogen Silsesquioxane Spin-On-Glass Enamel with Stainless Steel Substrate

Passivation Behavior and Surface Chemistry of 2507 Super Duplex Stainless Steel in Acidified Artificial Seawater Containing Thiosulfate

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