Dergach T.
Doctor of Technical Science, professor, SIHE «Prydniprovs’ka State Academy
of Civil Engineering and Architecture», Dnipro, Ukraine
Bolshakov V.
Doctor of Technical Science, professor, SIHE «Prydniprovs’ka State Academy
of Civil Engineering and Architecture», Dnipro, Ukraine
Sukhomlіn G.
Doctor of Technical Science, professor, SIHE «Prydniprovs’ka State Academy
of Civil Engineering and Architecture», Dnipro, Ukraine
MATERIALS SCIENCE FOUNDATIONS OF MAKING ECONOMICAL
OIL AND GAS LINE TUBES WITH IMPROVED CORROSION
RESISTANCE
Introduction. It is known that the main cause of failure of well equipment, in
particular, oil and gas pipelines, is corrosion of metal [1-3]. Application of methods for
intensive oil and gas extraction in recent years leads to further toughening of operating
modes, increasing corrosion damage and shortening operation life of tubes and
equipment. Corrosion-related accidents result in multimillion losses as they necessitate
frequent replacement and repair of tubes, loss and deficiency of products as well as
irreversible pollution of environment with highly mineralized stratal water and require
significant costs for elimination of adverse environmental impacts. In this regard,
obtaining of economical oil and gas pipelines with high corrosion resistance and
operational reliability is an urgent task [1-4].
The main internal factors affecting the corrosion resistance of the pipes are the
chemical composition of the content of the alloying and impurity elements and the
structure of the steel, which depends on the deformation and temperature treatments in
their manufacture, and can be adjusted in the process of tube production.
It should be noted that at present, modern theoretical achievements in the field of
material science concerning the influence of the energy of the boundaries and the
principle of grain boundary construction on the corrosion resistance of steels are not
realized. Consequently, it is important to conduct further systematic studies to
determine the influence of structural formation processes in deformation and
temperature treatments on corrosion, mechanical and operational properties of pipes.
The study objective consists in increasing corrosion resistance and operational
reliability of oil and gas line tubes by scientifically based choice of chemical
composition of steel and obtaining metal structure most favorable for deformation and
temperature treatment with application of progressive principle of grain boundary
engineering.
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