Influence of Structural Heterogeneity on the Perfomance of the Material of Large Diameter Pipes in Cold Climates

The migration of extractive industries to the Arctic regions has set the task of ensuring the reliability and durability of pipeline systems in conditions of low climatic temperatures. It is established that the formation of low-temperature mechanical properties and crack resistance of 10Mg2VNb steel is responsible for its structural state and residual rolling texture. The requirements prescribed in the current regulatory and technical documentation allow the formation of a wide range of microstructures and textures of steel rolling without setting strict requirements for grain size, banding, uneven grain size, non-metallic inclusions and residual texture of steel rolling, while pipes used for construction and repair of existing piping systems that meet regulatory requirements, for example, GOST R ISO 3183-2009, may be inoperative or limited in operability in low climatic temperatures. As a result of the analysis of the results obtained, it was confirmed that in order to increase the reliability and durability of pipeline systems operated in the Far North, it is necessary to refine the existing regulatory and technical base, including requirements for structural and textural states in the regulatory and technical documentation for pipe materials