INFLUENCE FACTORS ON THE FORMATION OF MECHANICAL PROPERTIES AND STRUCTURE OF STEEL FOR MANUFACTURE OF RAILWAY AXES
Keywords:railway axes, toughness, chemical composition, mechanical properties, manganese sulfides, microstructure
The characteristics of two industrial data sets with chemical composition and mechanical properties of rough railway axles steel samples of ОС and EA1N grades are studied. The main difference between the samples was the methods of manufacturing the original continuously cast blanks. Steel brand ОС is a converter manufacturing method without undergoing a vacuum operation. EA1N steel is smelted in an electric furnace with a degassing process in a vacuum cleaner. In each sample, two arrays were identified with different reduced and increased values of toughness. Analysis of differences in chemical composition was performed using Student's t-test. It was found, that when choosing the optimal chemical composition of steel for the manufacture of critical parts of the railway, it is necessary to take into account the method of steel production, raw materials and technological features of the metallurgical enterprise, as steel of even close chemical composition may have a completely different structure.