ЕКСПЕРИМЕНТАЛЬНІ ДОСЛІДЖЕННЯ ВПЛИВУ МЕТАЛУРГІЙНИХ ДЕФЕКТІВ СТАЛІ ВОДОПРОВІДНИХ ТРУБ НА СПРОТИВ РУЙНУВАННЮ

Low-alloy construction steels are characterized by insufficiently high and stable corrosion-mechanical properties, as well as resistance to fatigue fracture during long-term operation in aggressive environments. The results of experimental studies of the influence of metallurgical defects in continuously cast steel on the resistance to fracture of water pipes are presented. Low-alloy steels 08KhMChA and 06Kh1 were used. Studies of the change in the rate of fracture propagation, the dependence of the Menage impact toughness on the level of working stresses, and low-cycle fatigue during testing in air and in an aggressive NACE environment were conducted. The dynamics of the propagation of main cracks is established. The pattern of changes in the parameters of toughness and fatigue strength resistance depending on the composition of the experimental steels is shown.