Correlation between the stress-strain state parameters and magnetic characteristics of carbon steels

Горкунов, Э. С.; Задворкин, С. М.; Смирнов, С. В.; Mitropol’skaya, S. Yu.; Вичужанин, Д. И.

doi:10.1134/s0031918x07030131

Cited by 22 publications

(12 citation statements)

References 12 publications

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“…As with the carbon steels St3 and 45 [14], for the alloy steel 12GB, except in the initial stage of loading, the strain dependences of the coercive force are qualitatively similar to the stress-strain diagrams, whereas the dependences of maximum magnetic permeability and residual induction are inverse. In the initial portion of the tension diagram (see fig.…”

Section: The Effect Of Hydrogen Sulphide On the Magnetic Parameters Omentioning

confidence: 58%

Studying the effect of elastic-plastic strain and hydrogen sulphide on the magnetic behaviour of pipe steels as applied to their testing

et al. 2018

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Abstract. The paper reports results of magnetic measurements made on samples of the 12GB pipe steel (strength group X42SS) designed for producing pipes to be used in media with high hydrogen sulphide content, both in the initial state and after exposure to hydrogen sulphide, for 96, 192 and 384 hours under uniaxial elastic-plastic tension. At the stage of elastic deformation there is a unique correlation between the coercive force measured on a minor hysteresis loop in weak fields and tensile stress, which enables this parameter to be used for the evaluation of elastic stresses in pipes made of the 12 GB pipe steel under different conditions, including a hydrogen sulphide containing medium. The effect of the value of preliminary plastic strain, viewed as the initial stress-strain state, on the magnetic behaviour of X70 pipe steels under elastic tension and compression is studied. Plastic strain history affects the magnetic behaviour of the material during subsequent elastic deformation since plastic strain induces various residual stresses, and this necessitates taking into account the initial stress-strain state of products when developing magnetic techniques for the determination of their stress-strain parameters during operation.

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Section: The Effect Of Hydrogen Sulphide On the Magnetic Parameters Omentioning

confidence: 58%

Studying the effect of elastic-plastic strain and hydrogen sulphide on the magnetic behaviour of pipe steels as applied to their testing

et al. 2018

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“…It was established earlier in [5] that the magnetic permeability of ferromagnetic materials depends on the amount of their strain. As an example, fig.…”

Section: A Magnetic Methods For Detecting Plastic Strain Localization mentioning

confidence: 99%

A magnetic method for detecting plastic strain localization zones

Горкунов¹,

Задворкин²,

Kuzevanov³

et al. 2016

AIP Conference Proceedings

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“…The applicability of magnetic (coercimetric) methods for estimation of applied stress in structural steels was demonstrated earlier on a number of plain carbon and low-alloyed hot-rolled steel grades [1][2][3]. However advanced steels for trunk pipelines nowadays are produced mainly by controlled rolling.…”

Section: Introductionmentioning

confidence: 99%

Magnetic characterization techniques for monitoring gas pipelines under severe loading

Mitropol’skaya¹

2014

Energy and Sustainability V

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The reliable operation of trunk pipelines requires efficient monitoring of their technical state. At present, the issues involving evaluation of stress and strain in the most dangerous black spots of pipelines are urgent for the oil-and-gas industry. The problem is especially pressing for operations in corrosion-active media containing hydrogen sulfide, since hydrogenation leads to the formation of pores and cracks in steel. This paper is concerned with the magnetic, mechanical and structural characteristics of two advanced steel grades which are widely used for the construction of high-duty gas pipelines. The study shows that the numerical values of magnetic parameters depend on the magnetization direction about the control-rolling axis and correlate with the strength of X70 steel grade. It is found that for estimating the operating tensile stress, one should measure the magnetic characteristics in different directions about the pipe axis. Exposure to the hydrogen-containing medium leads to a significant decrease in the metal plasticity, an increase in the ultimate stress and yield stress, and a slight increase in the coercivity. The duration of the hydrogen charging dramatically affects the deformation behaviour of coercivity, thus providing a tool for magnetic monitoring of mechanical stress in steel pipes for transporting aggressive types of natural gas.

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Correlation between the stress-strain state parameters and magnetic characteristics of carbon steels

Cited by 22 publications

References 12 publications

Studying the effect of elastic-plastic strain and hydrogen sulphide on the magnetic behaviour of pipe steels as applied to their testing

Studying the effect of elastic-plastic strain and hydrogen sulphide on the magnetic behaviour of pipe steels as applied to their testing

A magnetic method for detecting plastic strain localization zones

Magnetic characterization techniques for monitoring gas pipelines under severe loading

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