Effects of metallurgical factors on service performance of duplex stainless steel for deep sour gas wells

Sakai, Jun–ichi; Matsushima, Iwao; Kamemura, Yoshiki; Tanimura, Masayuki; Osuka, Tatsumi

doi:10.1007/bf02833536

Cited by 7 publications

(14 citation statements)

References 8 publications

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“…[12] The present examination on the corrosion resistance of CD4MCU alloys with different Cr contents, however, strongly suggests that the beneficial effect of Cr can be overwhelmed by the change in the volume fraction of each phase. The polarization and the potentiostatic test results clearly demonstrated that the corrosion resistances of CD4MCU23 and CD4MCU28 alloy in 3.5 pct NaCl ϩ 5 pct H 2 SO 4 were quite similar to each other.…”

Section: Discussionmentioning

confidence: 79%

“…The Cr is a strong ferritestabilizing element, [6,12] and consequently, the volume fraction of ferritic phase increased from 48 to 63 pct with increasing Cr content from 23 to 28 pct in the present alloy. The size and shape of austenitic phase also varied greatly with different Cr contents, as shown in Figure 1.…”

Section: Discussionmentioning

confidence: 96%

“…Most of the recently developed duplex stainless steels therefore contain a small amount of N. The Cr is a strong ferrite-stabilizing element, and greatly improves the resistance to corrosion by the formation of stable passive film on the surface. [6,12,13] Despite the beneficial effect of Cr, its content is usually kept in the range between 22 and 26 pct, since it promotes the formation of the embrittling sigma phase at elevated temperature. [12] The sigma phase is also known to be detrimental to chloride SCC resistance.…”

Section: Introductionmentioning

confidence: 99%

“…[6,12,13] Despite the beneficial effect of Cr, its content is usually kept in the range between 22 and 26 pct, since it promotes the formation of the embrittling sigma phase at elevated temperature. [12] The sigma phase is also known to be detrimental to chloride SCC resistance. At present, the effect of Cr on the mechanical and corrosion behaviors of N-containing cast duplex stainless steels has not been well established.…”

Section: Introductionmentioning

confidence: 99%

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Effect of different Cr contents on tensile and corrosion behaviors of 0.13 pct N-containing CD4MCU cast duplex stainless steels

Jang

Son

Kim

et al. 2004

Metall Mater Trans A

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The tensile and corrosion behaviors of 0.13 pct N-containing CD4MCU cast duplex stainless steels with different Cr contents ranging from 23 to 28 pct were examined in the present study. The polarization tests were conducted in 3.5 pct NaCl ϩ 5 pct H 2 SO 4 aqueous solution for general corrosion resistance, and the in-situ slow strain rate (SSR) tests were also conducted in air and 3.5 pct NaCl ϩ 5 pct H 2 SO 4 aqueous solution to quantify the resistance to stress corrosion cracking (SCC) of the three materials. A substantial microstructural change in 0.13 pct N-containing CD4MCU cast duplex stainless steel was observed with different Cr contents, which in turn affected the tensile and corrosion behaviors significantly. Tensile behavior of 0.13 pct N-containing CD4MCU cast duplex stainless steel, for example, varied in a nonlinear manner with different Cr contents due to the volume change of hard ferritic phase and the presence of the second precipitates of soft austenitic phase in the ferrite matrix. The beneficial effect of Cr for improving the general corrosion and the SCC resistances was largely overshadowed by this variation in microstructural characteristics. The relationship between the microstructural evolution and the tensile and corrosion behavior of 0.13 pct N-containing CD4MCU cast duplex stainless steels with different Cr contents was discussed based on the optical microscopy and scanning electron microscopy (SEM) micrographic and fractographic observations.

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Section: Discussionmentioning

confidence: 79%

Section: Discussionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of different Cr contents on tensile and corrosion behaviors of 0.13 pct N-containing CD4MCU cast duplex stainless steels

Jang

Son

Kim

et al. 2004

Metall Mater Trans A

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“…[1,2,3] Since the development of first-generation duplex stainless steels in the 1930s, continuing research efforts have been exerted to improve the mechanical and corrosion properties, particularly by the various alloying additions of N, Cr, W, Mo, etc. [4][5][6][7][8][9][10][11] At present, however, most of the research on duplex stainless steel has been performed on the wrought products, and only a limited number of studies have been reported on the cast products of duplex stainless steels, despite their significance in the industry. Previously, the authors examined the tensile and corrosion behaviors of CD4MCU cast duplex stainless steels with different N and Cr contents and reported that the mechanical and corrosion properties were strongly influenced by the change in the shape and volume fraction of austenitic phase with different amounts of N or Cr.…”

Section: Introductionmentioning

confidence: 99%

Effect of different mo contents on tensile and corrosion behaviors of CD4MCU cast duplex stainless steels

Jang

Kim

Lee

2005

Metall Mater Trans A

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The tensile and corrosion behaviors of CD4MCU cast duplex stainless steels with different Mo contents of 0, 2, and 4 pct, respectively, were examined in the present study. The polarization and the in-situ slow-strain-rate (SSR) tests were conducted in a 3.5 pct NaCl ϩ 5 pct H 2 SO 4 aqueous solution to quantify the resistances to pitting corrosion and stress corrosion cracking (SCC) with different Mo contents. The addition of Mo, which is a strong ferrite stabilizer, affected the microstructure of the present alloy and, eventually, the tensile and corrosion behaviors in a complex manner. The tensile properties of CD4MCU cast duplex stainless steel, for example, were found to be determined by the volume fraction of hard ferritic phase, the presence of the second precipitates of soft austenitic phase in the ferrite matrix, and the shape of the austenitic phase. The addition of 2 pct Mo was detrimental to the corrosion properties of CD4MCU cast duplex stainless steel due to the significant increase in the volume fraction of ferritic phase. With the addition of 4 pct Mo, however, the resistances to pitting corrosion and SCC recovered to those of the specimen without Mo. The relationship between the microstructural evolution and the tensile and corrosion behavior of CD4MCU cast duplex stainless steels with different Mo contents was discussed based on the micrographic and fractographic observations.

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High‐temperature high‐pressure SCC testing of corrosion‐resistant alloys

Galakhova

Mori

Prattes

2021

Materials & Corrosion

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Stress corrosion cracking test methods of corrosion-resistant alloys are reviewed. The interest to write a review on this topic was drawn by demands for oil country tubular goods applicable in deep wells with high pressures, high temperatures, and the presence of H 2 S, where stress corrosion cracking is one of the most critical failure modes. All conventional methods for determining the stress corrosion cracking resistance of an alloy, mainly slow strain rate testing, constant load testing (tensile, 4-PB), constant strain testing (U-bend, C-ring), and fracture mechanics (double cantilever beam sample) are covered. Considering the variety of testing solutions, the field of search is narrowed to hot (up to 250°C) aqueous chloride solutions with dissolved H 2 S and CO 2 gases under high pressure (up to 200 bar total pressure).

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Effects of metallurgical factors on service performance of duplex stainless steel for deep sour gas wells

Cited by 7 publications

References 8 publications

Effect of different Cr contents on tensile and corrosion behaviors of 0.13 pct N-containing CD4MCU cast duplex stainless steels

Effect of different Cr contents on tensile and corrosion behaviors of 0.13 pct N-containing CD4MCU cast duplex stainless steels

Effect of different mo contents on tensile and corrosion behaviors of CD4MCU cast duplex stainless steels

High‐temperature high‐pressure SCC testing of corrosion‐resistant alloys

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