Corrosion of simulated weld HAZ of API X-80 pipeline steel

Mohammadi, Farzad; Eliyan, Faysal Fayez; Alfantazi, Akram

doi:10.1016/j.corsci.2012.06.014

Cited by 133 publications

(68 citation statements)

References 21 publications

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“…This carbonic acid lowers the pH of the solution and increases the corrosion rate of steels exposed to this medium. Despite the many studies [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17] undertaken to investigate CO 2 corrosion (also known as sweet corrosion), questions are still raised regarding the mechanism responsible for its occurrence. Many parameters are involved in the process and even small differences in chemical composition between one steel and another can strongly influence scale formation during CO 2 corrosion 12 .…”

Section: Introductionmentioning

confidence: 99%

“…Due to the material loss rates resulting from internal corrosion, it becomes necessary to thoroughly characterize the behaviour (for example: CO 2 corrosion behaviour at low partial pressure, under supercritical condition) of high strength steels which are used for oil and gas pipelines such as API 5L X65, X70 and X80 [1][2][3][4][5][6][7][8] . Well fluids and other products are transported in the oil and gas industry using pipelines.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of the corrosion scales formed on API 5L X70 and X80 steel pipe in the presence of CO2

2013

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Longitudinal welded joints samples of X70 and X80 API grade steel pipes were exposed to a deaerated 1% NaCl solution containing CO 2 , at temperatures in the range of 25 °C to 80 °C for 48 hours. Analogous samples were exposed to the adjacent vapour phase. The layer of corrosion products which formed on the base metal and welded regions of the samples was investigated using mass loss determinations, scanning electron microscopy and X-ray diffraction. The corrosion products formed in tests at 60 °C and were composed of FeCO 3 . The FeCO 3 which had initially formed at 80 °C was observed to have subsequently decomposed, resulting in a layer of Fe 2 O 3.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Analysis of the corrosion scales formed on API 5L X70 and X80 steel pipe in the presence of CO2

2013

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“…However, it is not only the toughness but also the strength that has great effect on the integrality and operation safety of pipeline [14,24]. Therefore, optimizing the amount of the alloying elements for the high-Nb X80 pipeline steels needs to overall consider the effects on strength and toughness.…”

Section: Discussionmentioning

confidence: 99%

Mechanical Properties of High-Nb X80 Steel Weld Pipes for the Second West-to-East Gas Transmission Pipeline Project

Qiao

Chen

Zhang

et al. 2017

Advances in Materials Science and Engineering

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The mechanical properties of steel pipe have great effects on the integrality and operation safety of gas transmission pipeline. In order to reduce the cost of the steel pipe, the high-Nb X80 pipeline steels with the different alloying systems have been used in the Second West-to-East Gas Transmission Pipeline Project. Nevertheless, an investigation into the effects of chemical composition on the mechanical properties of steel pipes is lacking. In this work, the chemical composition and mechanical properties of high-Nb X80 grade steel pipes with a diameter of 1,219 mm and a wall thickness of 22 mm, which are coiled by steels manufactured by three mills, have been analyzed. Furthermore, the effects of chemical composition of the steels on the mechanical properties of the pipe body and weld joint were discussed.

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“…The main consequence of this phenomenon is that corrosion resistance and mechanical properties of these materials are dramatically affected, particularly in the heat affected zone (HAZ) [10][11][12]. General and pitting corrosion of pipeline steels have been the subject of previous studies [2,3]. The most severe pitting is usually reported for the welded area with different rates of pit growth measured for the fusion zone, HAZ, and the base metal [4].…”

Section: Introductionmentioning

confidence: 99%

“…The history of the biodiesel industry reveals a significant number of faults (holes in pipes) caused by corrosion in acidic medium, that cause production losses and, consequently, economic losses. Although several studies related to the effect of heat input and thermal cycles on the microstructure of pipeline steels have been performed [1][2][3]8,9], there are few studies related to corrosion of LDSS in biodiesel plants. The weldability of this type of duplex steel is generally good when using slightly overalloyed filler metal as ISO 2307 N L or ISO 2209 N L [1].…”

Section: Introductionmentioning

confidence: 99%

Use of the Electrochemical Microcell Technique for Studying Pitting Corrosion at Welded Joints of Lean Duplex Stainless Steel Uns S32304

Sicupira¹,

Júnior²,

Bracarense³

et al. 2019

ABM Proceedings

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A pitting corrosion study of welded joints of lean duplex stainless steel (LDSS) UNS S32304 has been performed. LDSS S32304 thick plates were welded by different processes commonly employed in equipment and piping construction: SMAW (Shielded metal arc welding), GMAW (Gas metal arc welding) and FCAW (Flux cored arc welding). The electrochemical behavior of different weldment zones (fusion zone (FZ), base metal (BM) and heat affected zone (HAZ)) was characterized both independently using an electrochemical microcell and together through whole sample analysis. The electrochemical method applied was performed in acidified glycerin, a process fluid of the biodiesel industry. The results were correlated to the microstructural features of the materials. Based on the results, is possible to conclude that the breakdown potential (E b ) of the fusion zone (FZ) was higher than the E b obtained for the heat affected zone (HAZ). In general, top samples show higher breakdown potential than root samples and also the samples welded using filler metal 2209 has a better anodic behavior than the filler metal 2307. According to the results, GMAW welding process with 2209 as filler metal was revealed as the optimum chosen for application of 2304 duplex stainless steels in this case.

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Corrosion of simulated weld HAZ of API X-80 pipeline steel

Cited by 133 publications

References 21 publications

Analysis of the corrosion scales formed on API 5L X70 and X80 steel pipe in the presence of CO2

Analysis of the corrosion scales formed on API 5L X70 and X80 steel pipe in the presence of CO2

Mechanical Properties of High-Nb X80 Steel Weld Pipes for the Second West-to-East Gas Transmission Pipeline Project

Use of the Electrochemical Microcell Technique for Studying Pitting Corrosion at Welded Joints of Lean Duplex Stainless Steel Uns S32304

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