Stress corrosion cracking susceptibility of duplex stainless steels in sour gas environments

Rhodes, P.R.; Welch, G. A.; Abrego, L.

doi:10.1007/bf02833502

Cited by 15 publications

(21 citation statements)

References 2 publications

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“…During the elastic deformation step in SSRT, the most SCC susceptible samples quickly reached quite negative E OCP values of about −0.55 V SCE , which were maintained for long times. Under these potential/pH conditions, a significant conversion of S 2 O 3 2− into adsorbed sulphur and H 2 S is expected [55], suggesting that, beside an active path mechanism, hydrogen penetration may also contribute to SCC failure [29,45]. As for pitting corrosion and IGC, also in the case of SCC, a long aging at 850 • C determines a recovery of DSS 2304 performance, most likely due to Cr-and Mo-rediffusion and to the formation of less continuous Cr-and Mo-depleted areas.…”

Section: Discussionmentioning

confidence: 99%

Resistance of Thermally Aged DSS 2304 against Localized Corrosion Attack

Zanotto

Grassi

Balbo

et al. 2018

Metals

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In this paper, the effects of thermal aging in the 650–850 °C range on the localized corrosion behaviour of duplex stainless steel (DSS) 2304 was investigated. Pitting corrosion resistance was assessed by pitting potential (Epitt) and critical pitting temperature (CPT) determination, while the degree of sensitisation (DOS) to intergranular corrosion (IGC) was evaluated by double loop electrochemical potentiokinetic reactivation (DL-EPR). The susceptibility to stress corrosion cracking (SCC), evaluated in standard NACE TM-0177 solution at pH 2.7 and 25 °C, with the addition of S2O32− at 10−3 M, resulted in general good agreement with pitting and IGC behaviour. In fact, as-received DSS 2304 aged for 5 min at 650 °C or 750 °C presented a high resistance to localized corrosion. The alloy corrosion behaviour was severely impaired with an aging time of 60 min at 650 °C and of 10 or 60 min at 750 °C, due to the precipitation of finely distributed M23C6-type chromium carbides at ferrite/austenite interphases, which determined the formation of chromium and molybdenum depleted areas. The behaviour of samples aged at 850 °C also depended on the aging time, but, at 60 min, the rediffusion of passivating elements produced a recovery of the alloy resistance to pitting, IGC and SCC.

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Section: Discussionmentioning

confidence: 99%

Resistance of Thermally Aged DSS 2304 against Localized Corrosion Attack

Zanotto

Grassi

Balbo

et al. 2018

Metals

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“…[2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19] The Natl. Generally, these steels have yield strengths greater than 100 ksi [689 MPa] and hardnesses greater than Hardness Rockwell-C 22.…”

Section: Corrosion-what To Expectmentioning

confidence: 99%

Corrosion in Oil and Gas Production

Tuttle

1987

Journal of Petroleum Technology

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Corrosion is an important and costly problem in the petroleum industry, requiring special considerations in the design of production equipment. Severe environments involving C02 or H 2 S pose particular difficulties. Four types of corrosion exist: weight loss, stress corrosion cracking (SCC), corrosion fatigue, and galvanic corrosion. Design considerations and preventive techniques for each of these corrosion forms are discussed.

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“…The use of LDSS is proposed mostly on the basis of their pitting and stress-corrosion cracking (SCC) resistance in these environments [4]. Many papers deal with the SCC resistance of DSS 2205 [5][6][7][8][9] and superduplex stainless steels [10][11][12][13] in hydrogen sulphide (H 2 S) media. By contrast, few data are reported about the SCC behaviour of LDSS in these media.…”

Section: Introductionmentioning

confidence: 99%

Stress-Corrosion Cracking Behaviour of Lean-Duplex Stainless Steels in Chloride/Thiosulphate Environments

Zanotto

Grassi

Balbo

et al. 2018

Metals

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The stress-corrosion cracking (SCC) behaviour of two lean-duplex stainless steels (DSS 2304 and LDSS 2404) was studied by slow strain-rate tests (SSRT) in 20% NaCl solution at 80 • C (pH about 6) and in NACE TM-0177 solution at 25 • C (pH 2.7), both in the absence and in the presence of thiosulphate ions (S 2 O 3 2−). The SCC susceptibility of the two alloys was compared to that of LDSS 2101 investigated in a previous study. LDSS 2404 was always immune to SCC, while DSS 2304 (and LDSS 2101) suffered this corrosion form at specific concentrations. The high SCC resistance of DSS 2404 in both environments was connected to its high Mo content, while the significant SCC susceptibility of LDSS 2101 in NACE TM-0177 solution was likely due to the high Mn content of the alloy.

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Stress corrosion cracking susceptibility of duplex stainless steels in sour gas environments

Cited by 15 publications

References 2 publications

Resistance of Thermally Aged DSS 2304 against Localized Corrosion Attack

Resistance of Thermally Aged DSS 2304 against Localized Corrosion Attack

Corrosion in Oil and Gas Production

Stress-Corrosion Cracking Behaviour of Lean-Duplex Stainless Steels in Chloride/Thiosulphate Environments

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