Diagnostics of the Degree and Velocity of Metal Damage of the Plated Vessels Working under Excessive Pressure, Operated in Hydrogen and Hydrosulphuric Environments

V.M. Goritskiy, Dr. Sci. (Eng.), Head of the Department, oem@stako.ru G.R. Shneyderov, Cand. Sci. (Eng.), Head of Laboratory ZAO TSNIIPSK named after Melnikov, Moscow, Russia P.R. Nechiporenko, Head of Laboratory OOO INTERYUNIS, Moscow, Russia O.V. Gorchakov, Development Deputy Director AO VNIKTIneftekhimoborudovaniye, Volgograd, Russia


On the example of plate bimetallic R-301 reactor manufactured of structural steel with the wall thickness of 130 mm and the plate from stainless heat-proof steel, the phenomenon was studied concerning the effect of the operation in the hydrogen-containing environment on the size and speed of intergranular embrittlement development. For assessment of influence of the operational factors on the base metal state of the reactor the selection of microprobes of the structure external wall by mechanical way without thermal effect on metal has been made. Besides, macro-sample was selected with a diameter of 22 mm and 80 mm in depth in the lower head of the vessel (part of structure with the highest temperature of operation) with the use of a hole saw.
Research of the macro-sample metal included: determination of chemical composition, assessment of mechanical properties and impact strength, carrying out of metallographic, durometric and electron fractographic analysis. Essential changes in the structure and mechanical properties of the base metal, including in the zone of adjoining to the plate of R-301 reactor, were not found.
For identification of the degree of intergranular embrittlement of the reactor base metal the electronic fractographic analysis of fractures according to the current standard documentation was conducted. It is found that steel 12XM in the process of operation was subjected to low degree of hydrogen embrittlement..
The proposed methods of diagnostics of the type, degree and speed of damaging of two-layer reactor wall metal allow to carry out an assessment of the actual technical condition of metal case ensuring high economic effect.


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DOI: 10.24000/0409-2961-2017-9-58-64
Year: 2017
Issue num: September
Keywords : vessel working under excessive pressure electronic fractography hydrogen embrittlement structure hardness