FIELD: metallurgy.
SUBSTANCE: micro-section is made on operating pipeline. A microscope is secured on the pipeline, and there is compared visible picture of the micro-section with references of micro-structure by GOST (State Standard) 8233. There is determined dispersity of laminar and grained pearlite. At granularity of pearlite 35-100 % operational reliability of the pipeline is assessed as stable.
EFFECT: receiving reliable data on state and functionality of pipeline with service life over 30 years.
2 cl, 1 dwg
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