STRUCTURE AND MAGNETIC-PROPERTIES OF STEAM PIPES OF STEEL 12KH1MF AFTER LENGTHY OPERATION UNDER CONDITIONS OF CREEP

We investigated the magnetic properties, the macrostructure and micros tructure of specimens of steel 12Kh1MF cut out of the extended and neu tral zones of the knee of a steam pipe. It was discovered that the dev elopment of damage of the metal brings about a change in the distribut ion of dislocations and is accompanied by relaxation of internal stres ses. The article suggests a magnetic method of checking the developmen t of damage on the basis of an evaluation of a parameter connected wit h the level of internal stresses in the metal.