Studies on Hot Corrosion of the Microstructurally Different Regions of 2.25Cr-1Mo (T22) Boiler Tube Steel Weldment

Kumar, Ravindra; Tewari, Vinay Kumar; Prakash, S.

doi:10.1007/s11665-008-9309-2

Cited by 11 publications

(5 citation statements)

References 12 publications

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“…Thermo-gravimetric analysis (Figure 5) indicates that base metal shows the higher weight gain, and least was observed in the weldment. The results reveal that a high corrosion rate is found in base metal due to rapid Fe 2 O 3 scale formation, which is more porous and nonprotective, 6,9 and weldment shows the least corrosion rate. The PCGTA weldment shows better corrosion resistance.…”

Section: Discussionmentioning

confidence: 97%

“…NaVO 3 acts as an oxygen carrier, which is diffused into the oxide scales through Fe 2 O 3 and further increasing the rate of oxidation. 9,14 The presence of NaVO 3 dissolves the Cr 2 O 3 protective oxide scale to form the Na 2 CrO 4, which is non-protective. The sulfur from the Na 2 SO 4 is diffused into the bare and weld metal through the cracks and starts to degrade it, which might be increasing the oxidation rate.…”

Section: Discussionmentioning

confidence: 99%

“…This will lead to catastrophic corrosion of the metals. [7][8][9] Arivarasu et al 10 compared the corrosion behaviour of the dissimilar PCGTA, and CCGTA welded AISI 304 and AISI 4340 steel weldments in a boiler atmosphere. The author concluded that less corrosion rate could be observed in CCGTA weldment due to the formation of lower delta ferrites.…”

Section: Introductionmentioning

confidence: 99%

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Hot corrosion performance of bare and pulsed current welded Fe-based A-286 alloy in chlorine and sulphur environment

Dinek

Mohan

Jithesh

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part E:

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This present research work focuses on the hot corrosion performance of the base metal, weldment, and weld metal of A-286 alloy in sodium sulphate (Na2SO4)–5% sodium chloride (NaCl)–7.5% sodium metavanadate (NaVO3) (3SM) atmosphere at 700 °C. A pulsed current gas tungsten arc welding process is employed to make a similar joining of A-286 alloy using the filler material ERNiCrMo-3. The corrosion kinetics of the specimens has been determined using the thermo-gravimetric technique. The phase compositions of the reaction products are studied by X-ray diffraction, and the surface morphology of the scales is explored by scanning electron microscope analysis. The corroded samples are subjected to a cross-sectional study to ensure the corrosion attack and scales thickness using a SEM with elemental mapping technique. The result indicates that weldment showed better corrosion resistance than bare metal. A thick oxide scale could be found in the bare metal specimen than the weld metal. In the case of base metal, the formation of non-adherent and porous iron (III) oxide (Fe2O3) leads to rapid corrosion. The weight gain of weldment is about 1.96 and 1.13 times less than bare alloy and weld metal.

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Section: Discussionmentioning

confidence: 97%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Hot corrosion performance of bare and pulsed current welded Fe-based A-286 alloy in chlorine and sulphur environment

Dinek

Mohan

Jithesh

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part E:

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“…Kumar et al, [31] Studied about hot corrosion of micro structurally different sections of 2.25Cr-1Mo (T-22) boiler tube welding. this study explains that even welded portions gets oxidized under molten salt Na2So4 -60% V 2 O 5 environment in boiler at 900%.the welding base metal is tungsten which gets easily oxidized under this environments at very higher rates can be studied by X ray techniques of various phase change and oxide formations.…”

Section: Studies On Thermal Spray Coatingmentioning

confidence: 99%

Current Status of Prevention of Hot Corrosion of Boiler Steels with Thermal Spray Coating

Singh¹,

Singh²,

Goyal³

2018

AJEAT

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In the thermal power plant, various conventional steels are used to manufacture boiler components. Due to high operating temperature of these boilers, these conventional steels are unable to resist hot corrosion. In recent years researchers have used various techniques to resist hot corrosion out of these techniques, thermal spray coating process have gained lot of interest due to the ease of coating, low operating cost, and various other advantages. With these coating processes a thin layer of coating material is developed over steel alloys surface which creates hindrance to penetration of corroding element and hereby reduce corrosion. This paper is an attempt to present a comprehension the study related to hot corrosion of thermal spray coating on boiler steels at high temperatures.

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“…Kumar et al. 20 did research on the hot corrosion behavior of 2.25Cr-1Mo steel and its weldments using TIG welding and suggested that the weight gain of T22 base metal was much higher than the weight gain by the weld metal. The microstructural investigation of different weld region of T22 shows that base metal majorly comprises of ferrite (a white constituent) and pearlite.…”

Section: Introductionmentioning

confidence: 99%

Mechanical, microstructure, and hot corrosion investigations on P22/P91 dissimilar tungsten inert gas weld

Khan

Mahajan

Khan

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part L:

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The P22/P91 dissimilar weld increasingly used in supercritical power plan boilers calls for experimental investigations on its properties for enhanced performance in high-temperature service conditions. This study investigates the weld joint between P22/P91 steel using tungsten inert gas process employing a P22 matching filler metal. The fabricated weld has been characterized for mechanical properties of tensile strength and microhardness. The microstructural examination has been carried out in the weld region, transition zones, and base metals. The weld was exposed to a temperature of 700 °C in the environment of molten salt (50% Na2SO4 + 50% NaCl) to quantify the effect of high-temperature corrosion at its sight of application. Furthermore, the welds were also shot-peened and its effect on corrosion properties has been examined. The corroded specimens were examined using X-ray diffraction and scanning electron microscope to analyze the oxide scale produced upon exposure to high temperature in a controlled environment. The P22 base metal was found to oxidize more severely as compared to the weld fusion zone. Shot peening improves the corrosion resistance of weld by 7.56%. The results of this study comprehensively cover multiple aspects of weld integrity as per the service conditions, with its results having significant application in the power plant industry.

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Studies on Hot Corrosion of the Microstructurally Different Regions of 2.25Cr-1Mo (T22) Boiler Tube Steel Weldment

Cited by 11 publications

References 12 publications

Hot corrosion performance of bare and pulsed current welded Fe-based A-286 alloy in chlorine and sulphur environment

Hot corrosion performance of bare and pulsed current welded Fe-based A-286 alloy in chlorine and sulphur environment

Current Status of Prevention of Hot Corrosion of Boiler Steels with Thermal Spray Coating

Mechanical, microstructure, and hot corrosion investigations on P22/P91 dissimilar tungsten inert gas weld

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