Abstract
Oil&gas producing industry today is increased production volumes from old deposits on land, offshore and deep-water. The materials used to create modern equipment that meets these trends should be distinguished by increased productivity in conditions of corrosion and high pressure, to ensure trouble-free operation. In such conditions, taking into account the necessary provision of acceptable cost indicators, there is no alternative to duplex steels. Their crystal structure simultaneously allows using the advantages of ferritic and austenitic phases. The report presents the results of using a compositional and technological methods for structure management, the rationale alloying with copper (3.0-3.3%). Application of ESR in the manufacture of steel billets of super duplex steel has demonstrated the ability to simultaneously achieve physical, chemical and structural homogeneity, ensuring high corrosion&mechanical characteristics. The thermodynamic and kinetic conditions for the formation of optimal phase steel composition are determined. Grounded heat treatment regimes, prevent the formation of sigma and psi-phase and contribute to the formation of stable intermetallides (30-300 nm). Based on the test results of “Gazprom-VNIIGAZ” LLC the new steel is recommended for the manufacture of valve bodies and in-vessel internals used in the fields, that containing H2S and CO2 up to 25% in the fluid.
Highlights
Oil and gas production industry increases the extraction volumes of hydrocarbons from offshore and deep-water wells, boosts production from old fields [1]
The materials used to create modern equipment that meets these trends should be distinguished by increased productivity in conditions of corrosion and high pressure, to ensure trouble-free operation
The cost of products made from that steels is small compared to the cost of products made of nickel alloys and titanium [2,3] and can compete with the cost of products made of structural steels with corrosion-resistant overlaying
Summary
Oil and gas production industry increases the extraction volumes of hydrocarbons from offshore and deep-water wells, boosts production from old fields [1]. Austeniteferritic super duplex stainless steels (SDSS) are practically have no alternative for such operating conditions with taking into account the provision of acceptable cost indicators. They possess a unique combination of mechanical and corrosion properties among stainless steels, satisfactory weldability without heating, and good machinability. Russian companies are faced with the urgent need to organize their own production of high-tech equipment. Engineering solutions for such equipment should be based on the use of perspective materials of domestic production, capable of withstanding high corrosion and mechanical load without the danger of brittle fracture
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