Production of pipe steel of strength classes X80 and X70

Kushnarev, A. V.; Shekhovtsov, E. V.; Kapustina, E. S.; Remigo, S. A.; Kostenko, I. V.

doi:10.3103/s0967091208060168

Cited by 5 publications

(3 citation statements)

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“…Thus, the above magnetic characteristics of all investigated materials vary monotonically depending on the values of normal stresses in the range from -200 to +200 MPa, and these parameters can be used for the magnetic control of normal stresses and elastic deformations in the main pipelines. It should be noted that this range of the applied stresses is several times higher than the operating pressure for the mod ern pipelines, which, according to [16], is 10-15 MPa. Figure 4 shows the variation of the magnetic char acteristics of the base metal, material of the weld, and material of the HAZ of both steels under the action of tangential stresses.…”

Section: Resultsmentioning

confidence: 89%

Effect of the structure and stress state on the magnetic properties of metal in different zones of welded pipes of large diameter

Горкунов

Задворкин

Putilova

et al. 2014

Phys. Metals Metallogr.

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The existence of an extensive network of main pipelines, both already operating and being con structed, which are exploited under complex climatic conditions, specifies the need for the development of methods of a nondestructive control for testing the current state of both the pipes themselves and the welded joints in the process of manufacture and subsequent service. In this work, we give the results of microstruc tural studies, as well as the mechanical and magnetic properties of different zones of welded joints (base metal, heat affected zone, and the weld) of pipe steels of the strength classes X70 and X80 produced using the method of controlled rolling. The influence of different modes of loading on the magnetic characteristic of the metal of all three zones of welded joints has been investigated. The magnetic parameters that unambigu ously characterize changes in the stress-strain state of the separate zones of the welded joint (weld, heat affected zone, base metal) have been determined in certain ranges of the applied stresses.

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Section: Resultsmentioning

confidence: 89%

Effect of the structure and stress state on the magnetic properties of metal in different zones of welded pipes of large diameter

Горкунов

Задворкин

Putilova

et al. 2014

Phys. Metals Metallogr.

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“…Thus, the magnetic characteristics studied for all the materials tested vary uniquely at the values of normal stresses ranging between −200 and +200 MPa, and these parameters can be used for the magnetic inspection of normal stresses and elastic strains in trunk pipelines. Note that the above-mentioned range of applied stresses several times exceeds the working pressure for present-day pipelines, which, according to [7], is 10 to 15 MPa. The magnetic behaviors of the base metal, the weld and HAZ materials in the both steels under the effect of tangential stresses is shown in fig.…”

Section: Resultsmentioning

confidence: 99%

Application of Magnetic NDT Methods to Evaluate the Stress-Strain State of the Individual Zones of Welded Joints

Горкунов¹,

Задворкин²,

Putilova³

2014

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An extensive network of trunk pipelines, existing and under construction, working under hard environmental conditions necessitates the development of non-destructive testing techniques to be applied to diagnosing a current state of pipes and welded joints in the process of production and use. This paper reports on the results of the microstructural analysis and the study of the mechanical and magnetic properties of the different zones of welded joints (base metal, heat-affected zone material and weld material) in tube steels Х70 and Х80 made by controlled rolling. The effect of various loading conditions on the magnetic characteristics of the metals of the three zones is studied. Magnetic parameters uniquely characterizing the variation of the stress-strain state of the individual zones of a welded joint (the weld, the heat-affected zone, the base metal) in a certain range of applied stresses have been ascertained.

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“…Thus, the studied magnetic characteristics of all investigated materials unambiguously change at normal stress values in the range from -200 MPa to +200 MPa, and these parameters can be used for magnetic control of normal stresses and elastic deformations in trunk pipelines. It should be noted that the established range of applied stresses is several times higher than the working pressure for modern pipelines, which, according to [14], is 10-15 MPa.…”

Section: Table 2 Mechanical and Magnetic Properties Of Investigated Materialsmentioning

confidence: 99%

Investigation of Structure and Physical-Mechanical Properties of Metal in Different Zones of Welded Trunk Pipelines Made of X80 Strength Grade Steel

Putilova

2022

Materials Research Proceedings

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Abstract. The development of trunk pipelines network, taking into accont their operation in difficult climatic conditions, leads to the creation and the development of non-destructive testing methods to control the stress-strain state of the pipe itself, as well as welded joints. This work presents the results of studies of the microstructure, as well as the mechanical and magnetic characteristics of the metal cut from different zones of the welded joint of X80 strength class pipe steel.

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Production of pipe steel of strength classes X80 and X70

Cited by 5 publications

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Effect of the structure and stress state on the magnetic properties of metal in different zones of welded pipes of large diameter

Effect of the structure and stress state on the magnetic properties of metal in different zones of welded pipes of large diameter

Application of Magnetic NDT Methods to Evaluate the Stress-Strain State of the Individual Zones of Welded Joints

Investigation of Structure and Physical-Mechanical Properties of Metal in Different Zones of Welded Trunk Pipelines Made of X80 Strength Grade Steel

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