Influence of defects on the viscosity of liquid 32[Gamma]1 and 32[Gamma]2 steel

Liquid 32[Gamma]1 and 32[Gamma]2 steel samples obtained from oil and gas pipe with different defect contents are studied viscosimetrically. The influence of the defects recorded by magnetic-powder and ultrasound methods on the temperature and time dependences of the kinematic viscosity for liquid 32[Gamma]1 and 32[Gamma]2 steel is determined. The MACNDT Echomac instrument employed is designed for the ultrasonic detection of defects in oil and gas lines. The viscosity of the liquid steels is measured by means of damping torsional oscillations of a crucible with the melt during heating and subsequent cooling of the samples in the range 1460-1810°C.