FIELD: electrical engineering.
SUBSTANCE: invention relates to inspection technology, more specifically to non-destructive testing using electromagnetic methods, and can be used to determine steel grades of longitudinal-extended objects, for example bars, rods, pipes etc. The non-destructive method of testing longitudinal-extended objects involves stimulating an electromagnetic field in the test model, measurement of parametres which characterise electromagnetic properties of the material of the test model and processing measuring results by comparing them with limits of similar parametres of known steel grades. Parametres used, which characterise electromagnetic properties of material of the test model, are a value, inversely proportional to the speed of propagation of electromagnetic field, and degree of damping of electric magnetic field on a given section of the model. Measurement results can be processed by a programmable microprocessor.
EFFECT: invention allows for determining steel grades of longitudinal extended objects using a non-destructive method by selecting more informative parametres.
2 cl, 1 dwg
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