Methods for breaking strength determination of highductile pipeline steels

Purpose. New methods of high-strength construction materials receiving lead to formation of new types of the metal structure and change the fracture mode at the test. In connection with it, problems of ductile fracture propagation control are arisen. The aim of the paper is to analyze basic approaches of the ductile properties' level determination and breaking strength determination of high-strength pipeline steels. Methodology. In this paper, existing methods for breaking strength determination of high-ductile pipeline steels are analyzed. Results. It is shown that methods for breaking strength determination of high-strength and high-ductile pipeline steels are often insufficiently exact, and they are in need of correction and further investigations. Originality. The analysis discovers disadvantages and imperfections of existing methods of ductile fracture propagation evaluation. Practical value. In this paper necessity to create the universal methodology that allows fairly and exactly determinate breaking strength of high-ductile pipeline steels is proved.