УДК 656.56:620.193:620.197
(UDK 656.56:620.193:620.197)
(CHANGES IN THE MECHANICAL PROPERTIES AND FRACTURE MODE OF THE K60 GRADE PIPE METAL EXPOSED TO HYDROGEN GAS WITHIN TRANSPORTED METHANE-HYDROGEN MIXTURES)
The paper evaluates the effect of hydrogen gas within transported methane-hydrogen mixtures on the mechanical properties and fracture mode of pipe metal with different types of steel microstructure. The study aims to assess how the exposure of dry hydrogen gas within transported methane-hydrogen mixtures changes the mechanical properties and fracture mode of the K60 grade pipe metal made of steels of various compositions and structures.
The two lines of the study are analyzing the recent research data and mechanical testing of hydrogen-charged K60 (X70) grade pipe metal that has a ferrite-pearlitic or ferrite-bainitic microstructure. The literature analysis showed some general patterns of change in the mechanical properties of X52 – X100 (K50 – K80) grade pipeline steels depending on the hydrogen concentration in the mixture, hydrogen pressure, metal strength and microstructure. Our research on the hydrogen embrittlement susceptibility of the X70 (K60) grade pipe metal corresponds to different periods of pipe production (the 1980s and the present time). The tests used the slow strain rate test method on notched cylindrical specimens (according to ASTM G142), which were hydrogen charged in autoclaves with methane-hydrogen mixtures with 10, 30, and 100 % hydrogen at 10 MPa before straining.
The paper also gives fracture analysis results and an assessment of the pipe metal susceptibility to hydrogen embrittlement by the relative change in plasticity parameters compared to the initial state. Both microstructures are susceptible to hydrogen embrittlement, though to a different extent, and the degradation is much more intense in the banded ferrite-pearlitic microstructure steel.
S.Yu. Nastich, DSc in Engineering, Gazprom VNIIGAZ LLC (Saint Petersburg, Russia), S_Nastich@vniigaz.gazprom.ru
V.A. Lopatkin, Gazprom VNIIGAZ LLC, V_Lopatkin@vniigaz.gazprom.ru
A.B. Arabey, PhD in Engineering, Gazprom VNIIGAZ LLC, A_Arabey@vniigaz.gazprom.ru
V.A. Egorov, Gazprom VNIIGAZ LLC, V_Egorov@vniigaz.gazprom.ru
N.B. Nesterov, PhD in Engineering, PJSC Gazprom (Saint Petersburg, Russia), N.Nesterov@adm.gazprom.ru
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