Initiation mechanism of pitting corrosion in weld heat affected zone of duplex stainless steel

Hou, Yuyang; Nakamori, Yudai; Kadoi, Kota; Inoue, Hiroshige; Baba, Hayato

doi:10.1016/j.corsci.2022.110278

Cited by 29 publications

(20 citation statements)

References 42 publications

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“…The increase in the CPT of stainless steel with alloying additions can be predicted by the PREN, which is calculated using the chemical composition of the stainless steel, with a primary focus on the chromium (Cr), molybdenum (Mo), and nitrogen (N) content. 25,40 It is widely accepted that a higher PREN value indicates higher resistance to localized pitting corrosion. As can be seen in Table I, The PRENs for 316L, 317L, 904L, 2205, and 2507 are 24.5, 28.7 32.9, 35,1, and 44.5, respectively.…”

Section: Resultsmentioning

confidence: 99%

Statistical Distribution of Critical Pitting Temperature of Stainless Steels

Nakhaie

Zakeri

Naghizadeh

et al. 2023

J. Electrochem. Soc.

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The range of critical pitting temperature (CPT) for five different stainless steels is measured to determine whether it is wide or narrow. The impact of bulk solution composition and surface passivation on CPT was also measured in order to evaluate the relative importance of pit initiation and pit propagation on CPT. The results of the study revealed that CPT can be measured within a narrow range (±1.3°C) regardless of the alloy and bulk solution composition. It is also shown that experimental error caused by crevice corrosion can lead to a wider range of CPT values. These results are explained using the Salinas-Bravo and Newman CPT model. It is shown that, for the conditions studied, CPT is not dependent on pit initiation, but rather it is a transition phenomenon; i.e., CPT is determined by the transition from metastable to stable pit growth.

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Section: Resultsmentioning

confidence: 99%

Statistical Distribution of Critical Pitting Temperature of Stainless Steels

Nakhaie

Zakeri

Naghizadeh

et al. 2023

J. Electrochem. Soc.

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“…For DSSs, the corrosion resistance is majorly influenced by chemical composition and microstructure. The PREN, as shown in Equation (1) [31], is generally used for evaluating corrosion resistance. The lower PREN indicates the lower corrosion resistance [32].…”

Section: Electrochemical Propertiesmentioning

confidence: 99%

Microstructure, mechanical and electrochemical properties of wire-arc additively manufactured duplex stainless steel

Liu

Yin

Zhang

et al. 2023

Science and Technology of Welding and Joining

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Wire-arc additively manufactured (WAAM) super duplex stainless steels (DSS) 2594 walls were fabricated to investigate the microstructure of different regions, including top, body and root as well as the influence of microstructure on mechanical and electrochemical properties. The microstructure was composed of ferrite and austenite with a few nitride precipitates. The ferrite content decreased from top to root. The average hardness increased slightly from top to root. The ultimate tensile strength of different regions varied slightly, comparable to that of the hotrolled plate. Compared with those in vertical direction, samples in the horizontal direction had higher strength and lower elongation. The corrosion resistance ranked as root ≈ body > hotrolled > top.

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“…In addition to the previously mentioned benefits of using Duplex steels, the oil and gas sector can benefit from two more major characteristics: First, exceptional resistance to corrosive media such as carbon dioxide, hydrogen sulphide, chlorides, and low ph-value media in compared to austenitic grades. Second, exceptional response to stress corrosion cracking (SCC) in high chloride environments in contrast to austenitic grades [3].…”

Section: Figurementioning

confidence: 99%

Investigation of mechanical, microstructure, and corrosion properties of duplex stainless steel joint for natural gas processing facilities

Pamuji

Hakim²,

Sutrisna

et al. 2023

IOP Conf. Ser.: Earth Environ. Sci.

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Duplex stainless steel is an exotic material known for its excellent corrosion resistance and mechanical properties due to the presence of a two-phase structure that is quite balanced between ferrite and austenite, making it one of the top choices for the oil and gas industry. In this paper, we will discuss the process and investigation of the welding results of the A/SA 790 UNS 31803 duplex pipe joint which is connected using the gas tungsten arc welding (GTAW) process for gas purification process applications. The welding process and qualification is based on the ASME BPVC Sec code. IX was then tested to obtain information on the characteristics of the mechanical properties, microstructure, and corrosion resistance of the resulting joints. Heat input in the welding process is a crucial factor that determines the equilibrium of the ferrite and austenite phases which then correlates with the mechanical properties and corrosion resistance of the joint. Based on the microstructural analysis, there was a decrease in the ferrite phase in the weld metal, but it was still within the required limits. Furthermore, the results of the mechanical properties test showed that the tensile strength of the joint was greater than the tensile strength of the base metal and no open discontinuity was observed in the bending test. The corrosion test showed no signs of pitting corrosion with a weight loss value of 1.7 g/m2.

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Initiation mechanism of pitting corrosion in weld heat affected zone of duplex stainless steel

Cited by 29 publications

References 42 publications

Statistical Distribution of Critical Pitting Temperature of Stainless Steels

Statistical Distribution of Critical Pitting Temperature of Stainless Steels

Microstructure, mechanical and electrochemical properties of wire-arc additively manufactured duplex stainless steel

Investigation of mechanical, microstructure, and corrosion properties of duplex stainless steel joint for natural gas processing facilities

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