Influence of available impact energy of the testing machine on drop weight tear test characteristics of high toughness pipeline steels

Abstract. Problem. Currently, the problem he methodological issues related to drop load testing (DLT) of rolled plates and pipes made of highviscosity steel for high-pressure gas mains are considered. The imperfection of the current standards in terms of selecting the values of the stored energy of the copra, ensuring the correct testing of metal of the entire size range, is note. Goal Evaluation of the influence of stored copra energy on the results of WIP in terms of the amount of viscous component and absorbed fracture energy of full-thickness specimens of high-viscosity pipe steels widely used in the construction of high-pressure gas pipelines. Methodology. We examined sheets and base metal of pipes of strength classes X65, X70 and X80 of various thicknesses manufactured using thermomechanical rolling technology. The falling load tests were performed on Zwick copters of different capacities. Results The limits of application of the recommendations of APIRP5L3 and EN10274 standards for the choice of the value of the stored energy of the copra during the falling load test of high-viscosity pipe steels have been clarified. The recommendations are applicable only for steels with a thickness of less than 25 mm. Recommendations for selecting the optimal values of the stored energy of the copra at the HDM of high-viscosity pipe steels with a thickness of 25 mm and more are given Originality. The influence of stored copra energy on the results of WIP of high-viscosity pipe steels is estimated. Practical value. Recommendations were issued on the choice of the value of the stored energy of the ERW copra during testing, which will increase the measurement accuracy and reliability of the assessment of the resistance to destruction of gas pipelines