Investigation of the Mechanical Properties of Pipes for Long-Term Cooling Systems

Макаренко, В. Д.; Vynnykov, Yuriy; Manhura, Andrii

doi:10.1007/978-3-030-42939-3_17

Cited by 5 publications

(10 citation statements)

References 5 publications

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“…10, it is seen that the doping of the weld metal with molybdenum in the amount of 0.25% can dramatically reduce the size and number of non-metallic inclusions, which contributes to the improvement of the mechanical properties of weld metal, which is confirmed in [3,6,15,16]. The increase in visco-plastic characteristics of welds when alloyed with molybdenum is due, in our opinion, not only to the improvement of the structure of the deposited metal, but also to the plasticizing effect of molybdenum on the properties of the introduction phase and the matrix [3,6,15,16]. Molybdenum, being a part of carbides, reduces their hardness due to the increase of dislocation motion, which is caused by the decrease of the energy of interaction of its atoms with dislocations, thereby facilitating plastic deformation [15,18].…”

Section: Fig 7 Non-metallic Inclusions In Fractures Of Specimens Made Of Welds On 20k Steel: A) B) C) -Joints Not Doped With Mo; D) C) -Jmentioning

confidence: 69%

“…Effect of molybdenum, as noted authors [3,6,16], the most effective in co-introduced with metal carbide elements [18]. In addition, from the literature [3,5,7,12,15,16], the authors of many studies do not have a clear answer regarding the effect of molybdenum on the microstructure [19], composition and condition of non-metallic inclusions [20,21,22], which mainly determine the corrosion-mechanical and technological properties of welding joint [23]. In addition, it should be noted that in the literature there are no data on the use of molybdenum as alloying modifier in the main type of electrode coatings for welding low carbon steels used in the construction of pipeline construction as heat-power transport communications sector, industrial production, and urban heat networks [24,25,26].…”

Section: Literature Reviewmentioning

confidence: 83%

“…It is already known that doping welding connections, made basic type coated electrodes, allowing sufficient effectively regulate the mechanical properties of metals by changing the morphology [1,2,3], distribution and dispersion structural components [4,5,6,7,8,9,10,11], as well as changes in the composition [12,13,14,15] and condition of the grain boundaries [16,17]. Most researchers consider the influence of alloying elements on the properties of metals at single doping [5,6,7].…”

Section: Literature Reviewmentioning

confidence: 99%

“…The authors [13,14,15,16,17] believe that to obtain high mechanical properties of the weld metal ratio should be done: Mn,%/Si,% ≥ 2, with content Mn = 0.6-1.5%. The positive effect of molybdenum on the impact toughness of low-alloy steels (for example, grades 09G2S, 17G1S), the authors of [3,6,15,16] attribute to its low absorption at the grain boundaries and strong absorption on the surface of the carbides, which is difficult growth of the latter at the grain boundaries. Effect of molybdenum, as noted authors [3,6,16], the most effective in co-introduced with metal carbide elements [18].…”

Section: Literature Reviewmentioning

confidence: 99%

“…The positive effect of molybdenum on the impact toughness of low-alloy steels (for example, grades 09G2S, 17G1S), the authors of [3,6,15,16] attribute to its low absorption at the grain boundaries and strong absorption on the surface of the carbides, which is difficult growth of the latter at the grain boundaries. Effect of molybdenum, as noted authors [3,6,16], the most effective in co-introduced with metal carbide elements [18]. In addition, from the literature [3,5,7,12,15,16], the authors of many studies do not have a clear answer regarding the effect of molybdenum on the microstructure [19], composition and condition of non-metallic inclusions [20,21,22], which mainly determine the corrosion-mechanical and technological properties of welding joint [23].…”

Section: Literature Reviewmentioning

confidence: 99%

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Research of Microstructure of Molybden Doped Weldings of Oil and Gas Pipelines

Pandová

Rimár

Макаренко

et al. 2021

Management Systems in Production Engineering

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Still existing scientific, technical and technological developments to improve the quality of welded joints of metal pipe structures contain contradictions and uncertainty about the effects of alloying elements, such as molybdenum, mechanical and visco-plastic properties, as well as metallographic component joints. All this indicates the need for a systematic study of these problems for the development of rational metallurgical and technological measures to significantly improve the technological and corrosion-mechanical properties of weld metal. Metallographic studies, using laboratory equipment with high identifying ability, found that the doping of weld metal with molybdenum in the amount of 0.2-0.4% causes fragmentation of ferrite-pearlite structure, including carbides Mn and Fe, and also reduces the number and size of non-metallic inclusions – sulfides, oxides and silicates. Moreover, non-metallic inclusions have a dispersed appearance, which promotes plasticization of the structure, which directly increases the viscous-plastic characteristics and resistance of the metal joints to crack formation. Based on the results of metallographic research, the optimum content in the weld metal of the alloyed element – molybdenum, which is 0.2-0.4%, is determined.

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Section: Fig 7 Non-metallic Inclusions In Fractures Of Specimens Made Of Welds On 20k Steel: A) B) C) -Joints Not Doped With Mo; D) C) -Jmentioning

confidence: 69%

Section: Literature Reviewmentioning

confidence: 83%

Section: Literature Reviewmentioning

confidence: 99%

Section: Literature Reviewmentioning

confidence: 99%

Section: Literature Reviewmentioning

confidence: 99%

See 3 more Smart Citations

Research of Microstructure of Molybden Doped Weldings of Oil and Gas Pipelines

Pandová

Rimár

Макаренко

et al. 2021

Management Systems in Production Engineering

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Sustainable Futures in a Changing World – Reflections from the 5th International Conference on Sustainable Futures: Environmental, Technological, Social and Economic Matters (ICSF 2024)

Kiv,

Semerikov,

Nechypurenko

et al. 2024

IOP Conf. Ser.: Earth Environ. Sci.

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This paper presents an overview of the 5th International Conference on Sustainable Futures: Environmental, Technological, Social, and Economic Matters (ICSF 2024), held in May 2024. The conference brought together over 250 researchers, practitioners, and educators from 19 countries to share cutting-edge research and innovative solutions across a wide range of sustainability-related disciplines. The proceedings cover diverse topics, including climate change, disaster risk reduction, sustainable infrastructure, education for sustainability, environmental engineering, and sustainable business practices. Key themes that emerged include the integration of digital technologies in sustainability efforts, the impacts of global crises on sustainable development, and the importance of interdisciplinary approaches. The conference showcased both theoretical advancements and practical applications, with a particular focus on addressing the United Nations Sustainable Development Goals. This overview highlights the conference’s role in fostering global dialogue and collaboration to address pressing sustainability challenges and shape a more sustainable future.

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Analysis of corrosion fatigue steel strength of pump rods for oil wells

Vynnykov¹,

Kharchenko²,

Manhura³

et al. 2022

Min. miner. depos.

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Purpose is to perform analysis of corrosion durability (fatigue) of pump rod materials in terms of various chemically active simulation environments, and study influence of economically modified rare-earth impurity on corrosion fatigue strength of pump rod materials. Methods. 40 and 20N2M steel grades have been applied as well as experimental steel (ES). Steel of the conditinal ES grade has been melted within a pilot site of Institute of Electric Welding Named after E.O. Paton of the National Academy of Sciences of Ukraine. The steel was alloyed economically by means of a micro impurity of a rare-earth element (REE) being 0.03% of cerium; in addition, it contained comparatively low concentration of sulfur and phosphorus as well as minor concentration of dissolved hydrogen. The following has been used as simulation environments: 1) NACE environment (i.e. 5% NaCl solution which contained 0.5% СН3СООН, and saturated H2S; t = 22 ± 2°C; pH = 3.8-4.0); 2) 3% NaCl solution without hydrogen sulphide. Once every day, the environment was replaced to oxygenate it up to 8-10 mg/l concentration. Findings. Stability against sulfide stress-corrosion cracking (SSCC), hydrogen initiated cracking (HIC), and corrosion fatigue of steel of deep pump rods for oil industry has been studied. It has been defined that the experimental steel, modified economically by means of micro impurities of a REE, meets NACE MR0175-96 standard in terms of chemical composition as well as strength; in turn, 20N2M and 40 steel grades have high resistance neither to SSCC (threshold stresses are < 0.8 s) nor to corrosion fatigue attack; moreover, steel grade 40 has demonstrated low resistance to HIC (CLR > 6% and CTR > 3%). Originality. It has been identified that corrosion fatigue attack results from hydrogen penetration of steel initiating its cracking and hence destruction under the effect of alternating loads accelerated by the action of corrosive environment. Further, surface micro destructions, influenced by micro stresses, transform into large discontinuities and cracks with following macro destructions. Practical implications. It has been proved that high resistance to corrosion cracking can be achieved by means of refining of pump-rod steel of ferrite and perlite type using metallurgical methods, i.e. 0.01-0.03% REE microalloying.

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Investigation of the Mechanical Properties of Pipes for Long-Term Cooling Systems

Cited by 5 publications

References 5 publications

Research of Microstructure of Molybden Doped Weldings of Oil and Gas Pipelines

Research of Microstructure of Molybden Doped Weldings of Oil and Gas Pipelines

Sustainable Futures in a Changing World – Reflections from the 5th International Conference on Sustainable Futures: Environmental, Technological, Social and Economic Matters (ICSF 2024)

Analysis of corrosion fatigue steel strength of pump rods for oil wells

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